diff --git a/src/app/[locale]/admin/clubs/[club_id]/competitions/CompetitionsPageComponent.tsx b/src/app/[locale]/admin/clubs/[club_id]/competitions/CompetitionsPageComponent.tsx
new file mode 100644
index 0000000..cf22a64
--- /dev/null
+++ b/src/app/[locale]/admin/clubs/[club_id]/competitions/CompetitionsPageComponent.tsx
@@ -0,0 +1,126 @@
+'use client';
+
+import React, { useState } from 'react';
+import { Plus, Filter, Search, Trophy, FileText } from 'lucide-react';
+import { useCompetitions } from '@/src/hooks/queries/useCompetitionQueries';
+import { CompetitionList } from '@/src/components/competitions';
+import CreateCompetitionModal from './CreateCompetitionModal';
+import type { CompetitionStatus, CompetitionType } from '@/src/types/competition';
+
+interface CompetitionsPageComponentProps {
+  clubId: number;
+}
+
+const statusOptions: { value: CompetitionStatus | 'all'; label: string }[] = [
+  { value: 'all', label: 'All Statuses' },
+  { value: 'draft', label: 'Draft' },
+  { value: 'published', label: 'Published' },
+  { value: 'running', label: 'Running' },
+  { value: 'finished', label: 'Finished' },
+  { value: 'cancelled', label: 'Cancelled' },
+];
+
+const typeOptions: { value: CompetitionType | 'all'; label: string }[] = [
+  { value: 'all', label: 'All Types' },
+  { value: 'league', label: 'League' },
+  { value: 'tournament', label: 'Tournament' },
+  { value: 'challenge', label: 'Challenge' },
+  { value: 'hybrid', label: 'Hybrid' },
+];
+
+export default function CompetitionsPageComponent({ clubId }: CompetitionsPageComponentProps) {
+  const [statusFilter, setStatusFilter] = useState<CompetitionStatus | 'all'>('all');
+  const [typeFilter, setTypeFilter] = useState<CompetitionType | 'all'>('all');
+  const [isCreateModalOpen, setIsCreateModalOpen] = useState(false);
+
+  const { data: competitions, isLoading, error } = useCompetitions(clubId, {
+    status: statusFilter === 'all' ? undefined : statusFilter,
+    type: typeFilter === 'all' ? undefined : typeFilter,
+  });
+
+  return (
+    <div>
+      {/* Page Header */}
+      <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-4 mb-8">
+        <div>
+          <h2 className="text-2xl font-bold text-slate-900">Competitions</h2>
+          <p className="text-slate-600 mt-1">
+            Manage leagues, tournaments, and challenges
+          </p>
+        </div>
+        <div className="flex gap-3">
+          <button
+            onClick={() => window.location.href = `competitions/templates`}
+            className="inline-flex items-center px-4 py-2.5 bg-white border border-slate-200 text-slate-700 font-semibold rounded-xl hover:bg-slate-50 transition-colors"
+          >
+            <FileText className="w-5 h-5 mr-2" />
+            Templates
+          </button>
+          <button
+            onClick={() => setIsCreateModalOpen(true)}
+            className="inline-flex items-center px-4 py-2.5 bg-gradient-to-r from-indigo-600 via-purple-600 to-pink-600 text-white font-semibold rounded-xl hover:shadow-lg transition-all"
+          >
+            <Plus className="w-5 h-5 mr-2" />
+            New Competition
+          </button>
+        </div>
+      </div>
+
+      {/* Filters */}
+      <div className="flex flex-wrap gap-4 mb-6">
+        <div className="relative">
+          <Filter className="absolute left-3 top-1/2 transform -translate-y-1/2 w-4 h-4 text-slate-400" />
+          <select
+            value={statusFilter}
+            onChange={(e) => setStatusFilter(e.target.value as CompetitionStatus | 'all')}
+            className="pl-10 pr-4 py-2.5 bg-white border border-slate-200 rounded-xl text-sm font-medium text-slate-700 focus:outline-none focus:ring-2 focus:ring-purple-500 focus:border-transparent appearance-none cursor-pointer"
+          >
+            {statusOptions.map((option) => (
+              <option key={option.value} value={option.value}>
+                {option.label}
+              </option>
+            ))}
+          </select>
+        </div>
+        <div className="relative">
+          <Trophy className="absolute left-3 top-1/2 transform -translate-y-1/2 w-4 h-4 text-slate-400" />
+          <select
+            value={typeFilter}
+            onChange={(e) => setTypeFilter(e.target.value as CompetitionType | 'all')}
+            className="pl-10 pr-4 py-2.5 bg-white border border-slate-200 rounded-xl text-sm font-medium text-slate-700 focus:outline-none focus:ring-2 focus:ring-purple-500 focus:border-transparent appearance-none cursor-pointer"
+          >
+            {typeOptions.map((option) => (
+              <option key={option.value} value={option.value}>
+                {option.label}
+              </option>
+            ))}
+          </select>
+        </div>
+      </div>
+
+      {/* Error State */}
+      {error && (
+        <div className="bg-red-50 border border-red-200 rounded-xl p-4 mb-6">
+          <p className="text-red-700 font-medium">
+            Failed to load competitions. Please try again.
+          </p>
+        </div>
+      )}
+
+      {/* Competition List */}
+      <CompetitionList
+        competitions={competitions ?? []}
+        facilityId={clubId}
+        isLoading={isLoading}
+        emptyMessage="No competitions yet. Create your first competition to get started."
+      />
+
+      {/* Create Competition Modal */}
+      <CreateCompetitionModal
+        isOpen={isCreateModalOpen}
+        onClose={() => setIsCreateModalOpen(false)}
+        facilityId={clubId}
+      />
+    </div>
+  );
+}
diff --git a/src/app/[locale]/admin/clubs/[club_id]/competitions/CreateCompetitionModal.tsx b/src/app/[locale]/admin/clubs/[club_id]/competitions/CreateCompetitionModal.tsx
new file mode 100644
index 0000000..fb79af5
--- /dev/null
+++ b/src/app/[locale]/admin/clubs/[club_id]/competitions/CreateCompetitionModal.tsx
@@ -0,0 +1,418 @@
+'use client';
+
+import React, { useState, useEffect } from 'react';
+import { X, Trophy, Target, Zap, Layers, Loader2, AlertCircle } from 'lucide-react';
+import Modal from '@/src/components/modals/Modal';
+import ModalHeader from '@/src/components/modals/ModalHeader';
+import ModalBody from '@/src/components/modals/ModalBody';
+import ModalFooter from '@/src/components/modals/ModalFooter';
+import { useCompetitionTemplates } from '@/src/hooks/queries/useCompetitionQueries';
+import { useCreateCompetition } from '@/src/hooks/mutations/useCompetitionMutations';
+import type {
+  CompetitionType,
+  CompetitionVisibility,
+  CreateCompetitionRequest,
+  CompetitionTemplate,
+} from '@/src/types/competition';
+
+interface CreateCompetitionModalProps {
+  isOpen: boolean;
+  onClose: () => void;
+  facilityId: number;
+}
+
+const competitionTypes: {
+  type: CompetitionType;
+  label: string;
+  description: string;
+  Icon: React.ComponentType<{ className?: string }>;
+}[] = [
+  {
+    type: 'league',
+    label: 'League',
+    description: 'Round-robin format with standings',
+    Icon: Trophy,
+  },
+  {
+    type: 'tournament',
+    label: 'Tournament',
+    description: 'Knockout bracket format',
+    Icon: Target,
+  },
+  {
+    type: 'challenge',
+    label: 'Challenge',
+    description: 'Rating-based leaderboard',
+    Icon: Zap,
+  },
+  {
+    type: 'hybrid',
+    label: 'Hybrid',
+    description: 'Multiple stages combined',
+    Icon: Layers,
+  },
+];
+
+const visibilityOptions: { value: CompetitionVisibility; label: string; description: string }[] = [
+  { value: 'public', label: 'Public', description: 'Anyone can see and register' },
+  { value: 'unlisted', label: 'Unlisted', description: 'Only accessible via link' },
+  { value: 'private', label: 'Private', description: 'Invite only' },
+];
+
+export default function CreateCompetitionModal({
+  isOpen,
+  onClose,
+  facilityId,
+}: CreateCompetitionModalProps) {
+  const [step, setStep] = useState<'source' | 'details'>('source');
+  const [selectedTemplate, setSelectedTemplate] = useState<CompetitionTemplate | null>(null);
+  const [formData, setFormData] = useState<{
+    type: CompetitionType;
+    title: string;
+    description: string;
+    visibility: CompetitionVisibility;
+    starts_at: string;
+    ends_at: string;
+    registration_open_at: string;
+    registration_close_at: string;
+    sport_id: number;
+  }>({
+    type: 'tournament',
+    title: '',
+    description: '',
+    visibility: 'public',
+    starts_at: '',
+    ends_at: '',
+    registration_open_at: '',
+    registration_close_at: '',
+    sport_id: 1, // Default to padel
+  });
+  const [formError, setFormError] = useState<string | null>(null);
+
+  const { data: templates, isLoading: templatesLoading } = useCompetitionTemplates(facilityId);
+  const createMutation = useCreateCompetition(facilityId);
+
+  // Reset form when modal closes
+  useEffect(() => {
+    if (!isOpen) {
+      setStep('source');
+      setSelectedTemplate(null);
+      setFormData({
+        type: 'tournament',
+        title: '',
+        description: '',
+        visibility: 'public',
+        starts_at: '',
+        ends_at: '',
+        registration_open_at: '',
+        registration_close_at: '',
+        sport_id: 1,
+      });
+      setFormError(null);
+    }
+  }, [isOpen]);
+
+  function handleSelectTemplate(template: CompetitionTemplate) {
+    setSelectedTemplate(template);
+    setFormData((prev) => ({
+      ...prev,
+      type: template.type,
+      sport_id: template.sport_id,
+    }));
+    setStep('details');
+  }
+
+  function handleSelectFromScratch(type: CompetitionType) {
+    setSelectedTemplate(null);
+    setFormData((prev) => ({
+      ...prev,
+      type,
+    }));
+    setStep('details');
+  }
+
+  async function handleSubmit(e: React.FormEvent) {
+    e.preventDefault();
+    setFormError(null);
+
+    if (!formData.title.trim()) {
+      setFormError('Title is required');
+      return;
+    }
+    if (!formData.starts_at) {
+      setFormError('Start date is required');
+      return;
+    }
+
+    const request: CreateCompetitionRequest = {
+      type: formData.type,
+      sport_id: formData.sport_id,
+      title: formData.title.trim(),
+      description: formData.description.trim() || undefined,
+      visibility: formData.visibility,
+      starts_at: new Date(formData.starts_at).toISOString(),
+      ends_at: formData.ends_at ? new Date(formData.ends_at).toISOString() : undefined,
+      registration_open_at: formData.registration_open_at
+        ? new Date(formData.registration_open_at).toISOString()
+        : undefined,
+      registration_close_at: formData.registration_close_at
+        ? new Date(formData.registration_close_at).toISOString()
+        : undefined,
+      template_id: selectedTemplate?.template_id,
+      config: selectedTemplate?.config,
+    };
+
+    try {
+      await createMutation.mutateAsync(request);
+      onClose();
+    } catch (err) {
+      setFormError(err instanceof Error ? err.message : 'Failed to create competition');
+    }
+  }
+
+  return (
+    <Modal isOpen={isOpen} onClose={onClose} size="lg">
+      <ModalHeader
+        title={step === 'source' ? 'Create Competition' : 'Competition Details'}
+        subtitle={
+          step === 'source'
+            ? 'Choose a template or start from scratch'
+            : selectedTemplate
+              ? `Based on: ${selectedTemplate.name}`
+              : 'Configure your competition'
+        }
+        onClose={onClose}
+      />
+      <ModalBody padding="md">
+        {step === 'source' ? (
+          <div className="space-y-6">
+            {/* Templates Section */}
+            {templatesLoading ? (
+              <div className="flex items-center justify-center py-8">
+                <Loader2 className="w-8 h-8 text-purple-600 animate-spin" />
+              </div>
+            ) : templates && templates.length > 0 ? (
+              <div>
+                <h3 className="text-sm font-semibold text-slate-700 mb-3">
+                  From Template
+                </h3>
+                <div className="grid gap-3">
+                  {templates.map((template) => (
+                    <button
+                      key={template.template_id}
+                      onClick={() => handleSelectTemplate(template)}
+                      className="flex items-center gap-4 p-4 bg-slate-50 hover:bg-purple-50 border border-slate-200 hover:border-purple-300 rounded-xl text-left transition-colors"
+                    >
+                      <div className="w-10 h-10 bg-purple-100 rounded-lg flex items-center justify-center">
+                        {template.type === 'league' && <Trophy className="w-5 h-5 text-purple-600" />}
+                        {template.type === 'tournament' && <Target className="w-5 h-5 text-purple-600" />}
+                        {template.type === 'challenge' && <Zap className="w-5 h-5 text-purple-600" />}
+                        {template.type === 'hybrid' && <Layers className="w-5 h-5 text-purple-600" />}
+                      </div>
+                      <div className="flex-1">
+                        <h4 className="font-semibold text-slate-800">{template.name}</h4>
+                        {template.description && (
+                          <p className="text-sm text-slate-600 line-clamp-1">
+                            {template.description}
+                          </p>
+                        )}
+                      </div>
+                      <span className="text-xs px-2 py-1 bg-white rounded-full text-slate-500 capitalize">
+                        {template.type}
+                      </span>
+                    </button>
+                  ))}
+                </div>
+              </div>
+            ) : null}
+
+            {/* From Scratch Section */}
+            <div>
+              <h3 className="text-sm font-semibold text-slate-700 mb-3">
+                {templates && templates.length > 0 ? 'Or Start From Scratch' : 'Choose Type'}
+              </h3>
+              <div className="grid grid-cols-2 gap-3">
+                {competitionTypes.map(({ type, label, description, Icon }) => (
+                  <button
+                    key={type}
+                    onClick={() => handleSelectFromScratch(type)}
+                    className="flex flex-col items-center gap-2 p-4 bg-white hover:bg-slate-50 border border-slate-200 hover:border-purple-300 rounded-xl text-center transition-colors"
+                  >
+                    <div className="w-12 h-12 bg-gradient-to-br from-indigo-100 to-purple-100 rounded-xl flex items-center justify-center">
+                      <Icon className="w-6 h-6 text-purple-600" />
+                    </div>
+                    <div>
+                      <h4 className="font-semibold text-slate-800">{label}</h4>
+                      <p className="text-xs text-slate-500">{description}</p>
+                    </div>
+                  </button>
+                ))}
+              </div>
+            </div>
+          </div>
+        ) : (
+          <form onSubmit={handleSubmit} className="space-y-5">
+            {formError && (
+              <div className="flex items-center gap-2 p-3 bg-red-50 border border-red-200 rounded-xl">
+                <AlertCircle className="w-5 h-5 text-red-600 flex-shrink-0" />
+                <p className="text-sm text-red-700">{formError}</p>
+              </div>
+            )}
+
+            {/* Title */}
+            <div>
+              <label className="block text-sm font-medium text-slate-700 mb-1.5">
+                Title <span className="text-red-500">*</span>
+              </label>
+              <input
+                type="text"
+                value={formData.title}
+                onChange={(e) => setFormData((prev) => ({ ...prev, title: e.target.value }))}
+                placeholder="e.g., Summer Tournament 2025"
+                className="w-full px-4 py-2.5 border border-slate-200 rounded-xl focus:outline-none focus:ring-2 focus:ring-purple-500 focus:border-transparent"
+              />
+            </div>
+
+            {/* Description */}
+            <div>
+              <label className="block text-sm font-medium text-slate-700 mb-1.5">
+                Description
+              </label>
+              <textarea
+                value={formData.description}
+                onChange={(e) =>
+                  setFormData((prev) => ({ ...prev, description: e.target.value }))
+                }
+                placeholder="Brief description of the competition..."
+                rows={3}
+                className="w-full px-4 py-2.5 border border-slate-200 rounded-xl focus:outline-none focus:ring-2 focus:ring-purple-500 focus:border-transparent resize-none"
+              />
+            </div>
+
+            {/* Visibility */}
+            <div>
+              <label className="block text-sm font-medium text-slate-700 mb-1.5">
+                Visibility
+              </label>
+              <div className="grid grid-cols-3 gap-2">
+                {visibilityOptions.map((option) => (
+                  <button
+                    key={option.value}
+                    type="button"
+                    onClick={() =>
+                      setFormData((prev) => ({ ...prev, visibility: option.value }))
+                    }
+                    className={`p-3 border rounded-xl text-center transition-colors ${
+                      formData.visibility === option.value
+                        ? 'border-purple-500 bg-purple-50 text-purple-700'
+                        : 'border-slate-200 hover:border-slate-300 text-slate-700'
+                    }`}
+                  >
+                    <div className="font-medium text-sm">{option.label}</div>
+                  </button>
+                ))}
+              </div>
+            </div>
+
+            {/* Dates */}
+            <div className="grid grid-cols-2 gap-4">
+              <div>
+                <label className="block text-sm font-medium text-slate-700 mb-1.5">
+                  Start Date <span className="text-red-500">*</span>
+                </label>
+                <input
+                  type="datetime-local"
+                  value={formData.starts_at}
+                  onChange={(e) =>
+                    setFormData((prev) => ({ ...prev, starts_at: e.target.value }))
+                  }
+                  className="w-full px-4 py-2.5 border border-slate-200 rounded-xl focus:outline-none focus:ring-2 focus:ring-purple-500 focus:border-transparent"
+                />
+              </div>
+              <div>
+                <label className="block text-sm font-medium text-slate-700 mb-1.5">
+                  End Date
+                </label>
+                <input
+                  type="datetime-local"
+                  value={formData.ends_at}
+                  onChange={(e) =>
+                    setFormData((prev) => ({ ...prev, ends_at: e.target.value }))
+                  }
+                  className="w-full px-4 py-2.5 border border-slate-200 rounded-xl focus:outline-none focus:ring-2 focus:ring-purple-500 focus:border-transparent"
+                />
+              </div>
+            </div>
+
+            {/* Registration Period */}
+            <div className="grid grid-cols-2 gap-4">
+              <div>
+                <label className="block text-sm font-medium text-slate-700 mb-1.5">
+                  Registration Opens
+                </label>
+                <input
+                  type="datetime-local"
+                  value={formData.registration_open_at}
+                  onChange={(e) =>
+                    setFormData((prev) => ({ ...prev, registration_open_at: e.target.value }))
+                  }
+                  className="w-full px-4 py-2.5 border border-slate-200 rounded-xl focus:outline-none focus:ring-2 focus:ring-purple-500 focus:border-transparent"
+                />
+              </div>
+              <div>
+                <label className="block text-sm font-medium text-slate-700 mb-1.5">
+                  Registration Closes
+                </label>
+                <input
+                  type="datetime-local"
+                  value={formData.registration_close_at}
+                  onChange={(e) =>
+                    setFormData((prev) => ({ ...prev, registration_close_at: e.target.value }))
+                  }
+                  className="w-full px-4 py-2.5 border border-slate-200 rounded-xl focus:outline-none focus:ring-2 focus:ring-purple-500 focus:border-transparent"
+                />
+              </div>
+            </div>
+          </form>
+        )}
+      </ModalBody>
+      <ModalFooter align="between">
+        {step === 'details' && (
+          <button
+            type="button"
+            onClick={() => setStep('source')}
+            className="px-4 py-2.5 text-slate-600 font-medium hover:text-slate-800 transition-colors"
+          >
+            Back
+          </button>
+        )}
+        <div className="flex gap-3 ml-auto">
+          <button
+            type="button"
+            onClick={onClose}
+            className="px-4 py-2.5 bg-slate-100 text-slate-700 font-semibold rounded-xl hover:bg-slate-200 transition-colors"
+          >
+            Cancel
+          </button>
+          {step === 'details' && (
+            <button
+              type="submit"
+              onClick={handleSubmit}
+              disabled={createMutation.isPending}
+              className="px-6 py-2.5 bg-gradient-to-r from-indigo-600 via-purple-600 to-pink-600 text-white font-semibold rounded-xl hover:shadow-lg transition-all disabled:opacity-50 disabled:cursor-not-allowed"
+            >
+              {createMutation.isPending ? (
+                <span className="flex items-center gap-2">
+                  <Loader2 className="w-4 h-4 animate-spin" />
+                  Creating...
+                </span>
+              ) : (
+                'Create Competition'
+              )}
+            </button>
+          )}
+        </div>
+      </ModalFooter>
+    </Modal>
+  );
+}
diff --git a/src/app/[locale]/admin/clubs/[club_id]/competitions/[competition_id]/CompetitionDetailComponent.tsx b/src/app/[locale]/admin/clubs/[club_id]/competitions/[competition_id]/CompetitionDetailComponent.tsx
new file mode 100644
index 0000000..0f4ee3a
--- /dev/null
+++ b/src/app/[locale]/admin/clubs/[club_id]/competitions/[competition_id]/CompetitionDetailComponent.tsx
@@ -0,0 +1,323 @@
+'use client';
+
+import React, { useState } from 'react';
+import Link from 'next/link';
+import {
+  ArrowLeft,
+  Loader2,
+  AlertCircle,
+  Calendar,
+  Users,
+  PlayCircle,
+  CheckCircle,
+  XCircle,
+  Clock,
+  Eye,
+  Settings,
+  Trophy,
+  ListOrdered,
+} from 'lucide-react';
+import useTranslation from '@/src/hooks/useTranslation';
+import Card from '@/src/components/cards/Card';
+import { CompetitionStatusBadge, CompetitionTypeBadge } from '@/src/components/competitions';
+import { useCompetition } from '@/src/hooks/queries/useCompetitionQueries';
+import {
+  usePublishCompetition,
+  useStartCompetition,
+  useFinishCompetition,
+  useCancelCompetition,
+} from '@/src/hooks/mutations/useCompetitionMutations';
+import OverviewTab from './tabs/OverviewTab';
+import RegistrationsTab from './tabs/RegistrationsTab';
+import ParticipantsTab from './tabs/ParticipantsTab';
+import FixturesTab from './tabs/FixturesTab';
+import StandingsTab from './tabs/StandingsTab';
+import type { CompetitionStatus } from '@/src/types/competition';
+
+interface CompetitionDetailComponentProps {
+  clubId: number;
+  competitionId: number;
+}
+
+type TabKey = 'overview' | 'registrations' | 'participants' | 'fixtures' | 'standings';
+
+const tabs: { key: TabKey; label: string; icon: React.ComponentType<{ className?: string }> }[] = [
+  { key: 'overview', label: 'Overview', icon: Eye },
+  { key: 'registrations', label: 'Registrations', icon: Users },
+  { key: 'participants', label: 'Participants', icon: Trophy },
+  { key: 'fixtures', label: 'Fixtures', icon: Calendar },
+  { key: 'standings', label: 'Standings', icon: ListOrdered },
+];
+
+function formatDate(dateString: string): string {
+  const date = new Date(dateString);
+  return date.toLocaleDateString('en-US', {
+    weekday: 'short',
+    month: 'short',
+    day: 'numeric',
+    year: 'numeric',
+    hour: '2-digit',
+    minute: '2-digit',
+  });
+}
+
+function StatusTransitionButton({
+  status,
+  competitionId,
+}: {
+  status: CompetitionStatus;
+  competitionId: number;
+}) {
+  const publishMutation = usePublishCompetition(competitionId);
+  const startMutation = useStartCompetition(competitionId);
+  const finishMutation = useFinishCompetition(competitionId);
+  const cancelMutation = useCancelCompetition(competitionId);
+
+  const isPending =
+    publishMutation.isPending ||
+    startMutation.isPending ||
+    finishMutation.isPending ||
+    cancelMutation.isPending;
+
+  if (status === 'draft') {
+    return (
+      <div className="flex gap-2">
+        <button
+          onClick={() => publishMutation.mutate()}
+          disabled={isPending}
+          className="inline-flex items-center px-4 py-2 bg-indigo-600 text-white font-semibold rounded-xl hover:bg-indigo-700 transition-colors disabled:opacity-50"
+        >
+          {publishMutation.isPending ? (
+            <Loader2 className="w-4 h-4 mr-2 animate-spin" />
+          ) : (
+            <PlayCircle className="w-4 h-4 mr-2" />
+          )}
+          Publish
+        </button>
+      </div>
+    );
+  }
+
+  if (status === 'published') {
+    return (
+      <div className="flex gap-2">
+        <button
+          onClick={() => startMutation.mutate()}
+          disabled={isPending}
+          className="inline-flex items-center px-4 py-2 bg-emerald-600 text-white font-semibold rounded-xl hover:bg-emerald-700 transition-colors disabled:opacity-50"
+        >
+          {startMutation.isPending ? (
+            <Loader2 className="w-4 h-4 mr-2 animate-spin" />
+          ) : (
+            <PlayCircle className="w-4 h-4 mr-2" />
+          )}
+          Start
+        </button>
+        <button
+          onClick={() => cancelMutation.mutate()}
+          disabled={isPending}
+          className="inline-flex items-center px-4 py-2 bg-red-100 text-red-700 font-semibold rounded-xl hover:bg-red-200 transition-colors disabled:opacity-50"
+        >
+          {cancelMutation.isPending ? (
+            <Loader2 className="w-4 h-4 mr-2 animate-spin" />
+          ) : (
+            <XCircle className="w-4 h-4 mr-2" />
+          )}
+          Cancel
+        </button>
+      </div>
+    );
+  }
+
+  if (status === 'running') {
+    return (
+      <div className="flex gap-2">
+        <button
+          onClick={() => finishMutation.mutate()}
+          disabled={isPending}
+          className="inline-flex items-center px-4 py-2 bg-purple-600 text-white font-semibold rounded-xl hover:bg-purple-700 transition-colors disabled:opacity-50"
+        >
+          {finishMutation.isPending ? (
+            <Loader2 className="w-4 h-4 mr-2 animate-spin" />
+          ) : (
+            <CheckCircle className="w-4 h-4 mr-2" />
+          )}
+          Finish
+        </button>
+      </div>
+    );
+  }
+
+  return null;
+}
+
+export default function CompetitionDetailComponent({
+  clubId,
+  competitionId,
+}: CompetitionDetailComponentProps) {
+  const { locale } = useTranslation();
+  const [activeTab, setActiveTab] = useState<TabKey>('overview');
+
+  const { data: competition, isLoading, error } = useCompetition(competitionId);
+
+  if (isLoading) {
+    return (
+      <div className="flex flex-col items-center justify-center py-20">
+        <Loader2 className="w-12 h-12 text-purple-600 animate-spin mb-4" />
+        <p className="text-slate-600">Loading competition...</p>
+      </div>
+    );
+  }
+
+  if (error || !competition) {
+    return (
+      <div className="py-8">
+        <Link
+          href={`/${locale}/admin/clubs/${clubId}/competitions`}
+          className="inline-flex items-center text-slate-600 hover:text-slate-900 font-medium transition-colors mb-6"
+        >
+          <ArrowLeft className="w-4 h-4 mr-2" />
+          Back to Competitions
+        </Link>
+        <div className="bg-red-50 border border-red-200 rounded-xl p-6">
+          <div className="flex items-start gap-3">
+            <AlertCircle className="w-6 h-6 text-red-600 flex-shrink-0" />
+            <div>
+              <h3 className="font-semibold text-red-800">Error Loading Competition</h3>
+              <p className="text-red-700 mt-1">
+                {error instanceof Error ? error.message : 'Competition not found'}
+              </p>
+            </div>
+          </div>
+        </div>
+      </div>
+    );
+  }
+
+  return (
+    <div>
+      {/* Back Link */}
+      <Link
+        href={`/${locale}/admin/clubs/${clubId}/competitions`}
+        className="inline-flex items-center text-slate-600 hover:text-slate-900 font-medium transition-colors mb-6"
+      >
+        <ArrowLeft className="w-4 h-4 mr-2" />
+        Back to Competitions
+      </Link>
+
+      {/* Header */}
+      <div className="mb-8">
+        <div className="flex flex-col lg:flex-row lg:items-start lg:justify-between gap-4 mb-4">
+          <div>
+            <div className="flex items-center gap-3 mb-2">
+              <CompetitionTypeBadge type={competition.type} size="sm" />
+              <CompetitionStatusBadge status={competition.status} size="sm" />
+            </div>
+            <h1 className="text-3xl font-bold text-slate-900">{competition.title}</h1>
+            {competition.description && (
+              <p className="text-slate-600 mt-2">{competition.description}</p>
+            )}
+          </div>
+          <StatusTransitionButton status={competition.status} competitionId={competitionId} />
+        </div>
+
+        {/* Quick Stats */}
+        <div className="grid grid-cols-2 md:grid-cols-4 gap-4">
+          <Card variant="bordered" padding="sm">
+            <div className="flex items-center gap-3">
+              <div className="w-10 h-10 bg-indigo-100 rounded-lg flex items-center justify-center">
+                <Calendar className="w-5 h-5 text-indigo-600" />
+              </div>
+              <div>
+                <p className="text-xs text-slate-500">Starts</p>
+                <p className="text-sm font-medium text-slate-800">
+                  {formatDate(competition.starts_at)}
+                </p>
+              </div>
+            </div>
+          </Card>
+          <Card variant="bordered" padding="sm">
+            <div className="flex items-center gap-3">
+              <div className="w-10 h-10 bg-purple-100 rounded-lg flex items-center justify-center">
+                <Users className="w-5 h-5 text-purple-600" />
+              </div>
+              <div>
+                <p className="text-xs text-slate-500">Participants</p>
+                <p className="text-sm font-medium text-slate-800">
+                  {competition.participant_count ?? 0}
+                </p>
+              </div>
+            </div>
+          </Card>
+          <Card variant="bordered" padding="sm">
+            <div className="flex items-center gap-3">
+              <div className="w-10 h-10 bg-amber-100 rounded-lg flex items-center justify-center">
+                <Clock className="w-5 h-5 text-amber-600" />
+              </div>
+              <div>
+                <p className="text-xs text-slate-500">Registrations</p>
+                <p className="text-sm font-medium text-slate-800">
+                  {competition.registration_count ?? 0} pending
+                </p>
+              </div>
+            </div>
+          </Card>
+          <Card variant="bordered" padding="sm">
+            <div className="flex items-center gap-3">
+              <div className="w-10 h-10 bg-pink-100 rounded-lg flex items-center justify-center">
+                <Trophy className="w-5 h-5 text-pink-600" />
+              </div>
+              <div>
+                <p className="text-xs text-slate-500">Stages</p>
+                <p className="text-sm font-medium text-slate-800">
+                  {competition.stages?.length ?? 0}
+                </p>
+              </div>
+            </div>
+          </Card>
+        </div>
+      </div>
+
+      {/* Tabs */}
+      <div className="border-b border-slate-200 mb-6">
+        <div className="flex overflow-x-auto scrollbar-hide -mb-px">
+          {tabs.map((tab) => {
+            const Icon = tab.icon;
+            const isActive = activeTab === tab.key;
+            return (
+              <button
+                key={tab.key}
+                onClick={() => setActiveTab(tab.key)}
+                className={`flex items-center gap-2 px-4 py-3 font-medium border-b-2 whitespace-nowrap transition-colors ${
+                  isActive
+                    ? 'border-purple-600 text-purple-600'
+                    : 'border-transparent text-slate-600 hover:text-slate-900 hover:border-slate-300'
+                }`}
+              >
+                <Icon className="w-4 h-4" />
+                {tab.label}
+              </button>
+            );
+          })}
+        </div>
+      </div>
+
+      {/* Tab Content */}
+      {activeTab === 'overview' && (
+        <OverviewTab competition={competition} clubId={clubId} />
+      )}
+      {activeTab === 'registrations' && (
+        <RegistrationsTab competitionId={competitionId} />
+      )}
+      {activeTab === 'participants' && (
+        <ParticipantsTab competitionId={competitionId} />
+      )}
+      {activeTab === 'fixtures' && (
+        <FixturesTab competition={competition} />
+      )}
+      {activeTab === 'standings' && (
+        <StandingsTab competition={competition} />
+      )}
+    </div>
+  );
+}
diff --git a/src/app/[locale]/admin/clubs/[club_id]/competitions/[competition_id]/page.tsx b/src/app/[locale]/admin/clubs/[club_id]/competitions/[competition_id]/page.tsx
new file mode 100644
index 0000000..2be7f6c
--- /dev/null
+++ b/src/app/[locale]/admin/clubs/[club_id]/competitions/[competition_id]/page.tsx
@@ -0,0 +1,13 @@
+import CompetitionDetailComponent from './CompetitionDetailComponent';
+
+export default async function CompetitionDetailPage({
+  params,
+}: {
+  params: Promise<{ club_id: string; competition_id: string }>;
+}) {
+  const { club_id, competition_id } = await params;
+  const clubId = parseInt(club_id, 10);
+  const competitionId = parseInt(competition_id, 10);
+
+  return <CompetitionDetailComponent clubId={clubId} competitionId={competitionId} />;
+}
diff --git a/src/app/[locale]/admin/clubs/[club_id]/competitions/[competition_id]/tabs/FixturesTab.tsx b/src/app/[locale]/admin/clubs/[club_id]/competitions/[competition_id]/tabs/FixturesTab.tsx
new file mode 100644
index 0000000..32a1179
--- /dev/null
+++ b/src/app/[locale]/admin/clubs/[club_id]/competitions/[competition_id]/tabs/FixturesTab.tsx
@@ -0,0 +1,274 @@
+'use client';
+
+import React, { useState } from 'react';
+import { Calendar, Play, RefreshCw, AlertCircle, Loader2, CheckCircle, Clock } from 'lucide-react';
+import Card from '@/src/components/cards/Card';
+import { useCompetitionFixtures } from '@/src/hooks/queries/useCompetitionQueries';
+import {
+  useGenerateFixtures,
+  useSetMatchWinner,
+} from '@/src/hooks/mutations/useCompetitionMutations';
+import type {
+  Competition,
+  CompetitionMatch,
+  CompetitionStage,
+  MatchStatus,
+} from '@/src/types/competition';
+
+interface FixturesTabProps {
+  competition: Competition;
+}
+
+const matchStatusConfig: Record<MatchStatus, {
+  label: string;
+  bgColor: string;
+  textColor: string;
+}> = {
+  draft: { label: 'Draft', bgColor: 'bg-slate-100', textColor: 'text-slate-600' },
+  needs_scheduling: { label: 'Needs Scheduling', bgColor: 'bg-amber-100', textColor: 'text-amber-700' },
+  scheduled: { label: 'Scheduled', bgColor: 'bg-indigo-100', textColor: 'text-indigo-700' },
+  in_progress: { label: 'In Progress', bgColor: 'bg-emerald-100', textColor: 'text-emerald-700' },
+  completed: { label: 'Completed', bgColor: 'bg-purple-100', textColor: 'text-purple-700' },
+  voided: { label: 'Voided', bgColor: 'bg-red-100', textColor: 'text-red-700' },
+};
+
+function MatchCard({
+  match,
+  competitionId,
+  stageId,
+}: {
+  match: CompetitionMatch;
+  competitionId: number;
+  stageId: number;
+}) {
+  const setWinnerMutation = useSetMatchWinner(competitionId, stageId);
+  const config = matchStatusConfig[match.status];
+
+  const homeName = match.home_participant?.display_name ?? 'TBD';
+  const awayName = match.away_participant?.display_name ?? 'TBD';
+  const canSetWinner =
+    match.status !== 'completed' &&
+    match.status !== 'voided' &&
+    match.home_participant_id &&
+    match.away_participant_id;
+
+  function handleSetWinner(winnerId: number) {
+    setWinnerMutation.mutate({
+      matchId: match.competition_match_id,
+      request: { winner_participant_id: winnerId },
+    });
+  }
+
+  return (
+    <div className="p-4 bg-white border border-slate-200 rounded-xl">
+      <div className="flex items-center justify-between mb-3">
+        <span className="text-xs text-slate-500">
+          Round {match.round_index + 1} • Match {match.match_index + 1}
+        </span>
+        <span className={`text-xs px-2 py-0.5 rounded-full ${config.bgColor} ${config.textColor}`}>
+          {config.label}
+        </span>
+      </div>
+
+      <div className="space-y-2">
+        {/* Home */}
+        <div
+          className={`flex items-center justify-between p-3 rounded-lg transition-colors ${
+            match.winner_participant_id === match.home_participant_id
+              ? 'bg-emerald-50 border border-emerald-200'
+              : 'bg-slate-50'
+          } ${canSetWinner && match.home_participant_id ? 'cursor-pointer hover:bg-purple-50' : ''}`}
+          onClick={() => canSetWinner && match.home_participant_id && handleSetWinner(match.home_participant_id)}
+        >
+          <span className={`font-medium ${homeName === 'TBD' ? 'text-slate-400' : 'text-slate-800'}`}>
+            {homeName}
+          </span>
+          {match.winner_participant_id === match.home_participant_id && (
+            <CheckCircle className="w-5 h-5 text-emerald-600" />
+          )}
+        </div>
+
+        <div className="text-center text-xs text-slate-400 font-medium">VS</div>
+
+        {/* Away */}
+        <div
+          className={`flex items-center justify-between p-3 rounded-lg transition-colors ${
+            match.winner_participant_id === match.away_participant_id
+              ? 'bg-emerald-50 border border-emerald-200'
+              : 'bg-slate-50'
+          } ${canSetWinner && match.away_participant_id ? 'cursor-pointer hover:bg-purple-50' : ''}`}
+          onClick={() => canSetWinner && match.away_participant_id && handleSetWinner(match.away_participant_id)}
+        >
+          <span className={`font-medium ${awayName === 'TBD' ? 'text-slate-400' : 'text-slate-800'}`}>
+            {awayName}
+          </span>
+          {match.winner_participant_id === match.away_participant_id && (
+            <CheckCircle className="w-5 h-5 text-emerald-600" />
+          )}
+        </div>
+      </div>
+
+      {match.scheduled_at && (
+        <div className="flex items-center gap-1.5 mt-3 text-xs text-slate-500">
+          <Clock className="w-3.5 h-3.5" />
+          {new Date(match.scheduled_at).toLocaleString()}
+        </div>
+      )}
+    </div>
+  );
+}
+
+function StageFixtures({
+  stage,
+  competitionId,
+}: {
+  stage: CompetitionStage;
+  competitionId: number;
+}) {
+  const { data: fixtures, isLoading, error } = useCompetitionFixtures(competitionId, stage.stage_id);
+  const generateMutation = useGenerateFixtures(competitionId);
+
+  const hasFixtures = fixtures && fixtures.length > 0;
+
+  function handleGenerateFixtures() {
+    generateMutation.mutate({
+      stageId: stage.stage_id,
+      request: {
+        stage_type: stage.stage_type,
+        legs: stage.config?.legs,
+        third_place_match: stage.config?.third_place_match,
+      },
+    });
+  }
+
+  if (isLoading) {
+    return (
+      <div className="flex items-center justify-center py-12">
+        <Loader2 className="w-8 h-8 text-purple-600 animate-spin" />
+      </div>
+    );
+  }
+
+  if (error) {
+    return (
+      <div className="flex items-center gap-2 p-4 bg-red-50 border border-red-200 rounded-xl">
+        <AlertCircle className="w-5 h-5 text-red-600" />
+        <p className="text-red-700">Failed to load fixtures</p>
+      </div>
+    );
+  }
+
+  if (!hasFixtures) {
+    return (
+      <div className="text-center py-12">
+        <Calendar className="w-12 h-12 text-slate-300 mx-auto mb-4" />
+        <h4 className="font-semibold text-slate-800 mb-2">No fixtures generated</h4>
+        <p className="text-slate-500 mb-4">
+          Generate fixtures to create the match schedule for this stage.
+        </p>
+        <button
+          onClick={handleGenerateFixtures}
+          disabled={generateMutation.isPending}
+          className="inline-flex items-center px-4 py-2 bg-gradient-to-r from-indigo-600 via-purple-600 to-pink-600 text-white font-semibold rounded-xl hover:shadow-lg transition-all disabled:opacity-50"
+        >
+          {generateMutation.isPending ? (
+            <Loader2 className="w-4 h-4 mr-2 animate-spin" />
+          ) : (
+            <Play className="w-4 h-4 mr-2" />
+          )}
+          Generate Fixtures
+        </button>
+      </div>
+    );
+  }
+
+  // Group by round
+  const rounds = fixtures.reduce((acc, match) => {
+    const round = match.round_index;
+    if (!acc[round]) acc[round] = [];
+    acc[round].push(match);
+    return acc;
+  }, {} as Record<number, CompetitionMatch[]>);
+
+  return (
+    <div className="space-y-6">
+      {Object.entries(rounds)
+        .sort(([a], [b]) => parseInt(a) - parseInt(b))
+        .map(([roundIndex, matches]) => (
+          <div key={roundIndex}>
+            <h4 className="font-semibold text-slate-700 mb-3">
+              Round {parseInt(roundIndex) + 1}
+            </h4>
+            <div className="grid gap-4 md:grid-cols-2 lg:grid-cols-3">
+              {matches
+                .sort((a, b) => a.match_index - b.match_index)
+                .map((match) => (
+                  <MatchCard
+                    key={match.competition_match_id}
+                    match={match}
+                    competitionId={competitionId}
+                    stageId={stage.stage_id}
+                  />
+                ))}
+            </div>
+          </div>
+        ))}
+    </div>
+  );
+}
+
+export default function FixturesTab({ competition }: FixturesTabProps) {
+  const [selectedStageId, setSelectedStageId] = useState<number | null>(
+    competition.stages?.[0]?.stage_id ?? null
+  );
+
+  const stages = competition.stages ?? [];
+  const selectedStage = stages.find((s) => s.stage_id === selectedStageId);
+
+  if (stages.length === 0) {
+    return (
+      <Card variant="bordered" padding="lg">
+        <div className="text-center py-8">
+          <Calendar className="w-12 h-12 text-slate-300 mx-auto mb-4" />
+          <h3 className="font-semibold text-slate-800 mb-1">No stages configured</h3>
+          <p className="text-slate-500">
+            Configure stages in the competition settings to manage fixtures.
+          </p>
+        </div>
+      </Card>
+    );
+  }
+
+  return (
+    <div>
+      {/* Stage Selector */}
+      {stages.length > 1 && (
+        <div className="flex gap-2 mb-6 overflow-x-auto pb-2">
+          {stages
+            .sort((a, b) => a.stage_order - b.stage_order)
+            .map((stage) => (
+              <button
+                key={stage.stage_id}
+                onClick={() => setSelectedStageId(stage.stage_id)}
+                className={`px-4 py-2 rounded-xl font-medium whitespace-nowrap transition-colors ${
+                  selectedStageId === stage.stage_id
+                    ? 'bg-purple-100 text-purple-700'
+                    : 'bg-slate-100 text-slate-600 hover:bg-slate-200'
+                }`}
+              >
+                {stage.name}
+              </button>
+            ))}
+        </div>
+      )}
+
+      {/* Fixtures */}
+      {selectedStage && (
+        <StageFixtures
+          stage={selectedStage}
+          competitionId={competition.competition_id}
+        />
+      )}
+    </div>
+  );
+}
diff --git a/src/app/[locale]/admin/clubs/[club_id]/competitions/[competition_id]/tabs/OverviewTab.tsx b/src/app/[locale]/admin/clubs/[club_id]/competitions/[competition_id]/tabs/OverviewTab.tsx
new file mode 100644
index 0000000..a664f41
--- /dev/null
+++ b/src/app/[locale]/admin/clubs/[club_id]/competitions/[competition_id]/tabs/OverviewTab.tsx
@@ -0,0 +1,207 @@
+'use client';
+
+import React from 'react';
+import { Calendar, Users, Eye, Globe, Lock, Link as LinkIcon } from 'lucide-react';
+import Card from '@/src/components/cards/Card';
+import type { Competition, CompetitionStage } from '@/src/types/competition';
+
+interface OverviewTabProps {
+  competition: Competition;
+  clubId: number;
+}
+
+function formatDate(dateString: string | null): string {
+  if (!dateString) return 'Not set';
+  const date = new Date(dateString);
+  return date.toLocaleDateString('en-US', {
+    weekday: 'short',
+    month: 'short',
+    day: 'numeric',
+    year: 'numeric',
+    hour: '2-digit',
+    minute: '2-digit',
+  });
+}
+
+function StageCard({ stage, index }: { stage: CompetitionStage; index: number }) {
+  const statusColors = {
+    pending: 'bg-slate-100 text-slate-700',
+    active: 'bg-emerald-100 text-emerald-700',
+    completed: 'bg-purple-100 text-purple-700',
+  };
+
+  const stageTypeLabels: Record<string, string> = {
+    round_robin: 'Round Robin',
+    group_stage: 'Group Stage',
+    knockout_single: 'Single Elimination',
+    knockout_double: 'Double Elimination',
+    rating_delta_challenge: 'Rating Challenge',
+  };
+
+  return (
+    <div className="flex items-center gap-4 p-4 bg-slate-50 rounded-xl">
+      <div className="w-10 h-10 bg-white rounded-lg flex items-center justify-center font-bold text-slate-600 border border-slate-200">
+        {index + 1}
+      </div>
+      <div className="flex-1">
+        <div className="flex items-center gap-2">
+          <h4 className="font-semibold text-slate-800">{stage.name}</h4>
+          <span className={`text-xs px-2 py-0.5 rounded-full ${statusColors[stage.status]}`}>
+            {stage.status}
+          </span>
+        </div>
+        <p className="text-sm text-slate-600">
+          {stageTypeLabels[stage.stage_type] || stage.stage_type}
+          {stage.match_count !== undefined && ` • ${stage.match_count} matches`}
+          {stage.groups && stage.groups.length > 0 && ` • ${stage.groups.length} groups`}
+        </p>
+      </div>
+    </div>
+  );
+}
+
+export default function OverviewTab({ competition, clubId }: OverviewTabProps) {
+  const visibilityIcons = {
+    public: Globe,
+    unlisted: LinkIcon,
+    private: Lock,
+  };
+  const VisibilityIcon = visibilityIcons[competition.visibility];
+
+  return (
+    <div className="grid gap-6 lg:grid-cols-2">
+      {/* Competition Details */}
+      <Card variant="bordered" padding="md">
+        <h3 className="text-lg font-semibold text-slate-800 mb-4">Competition Details</h3>
+        <div className="space-y-4">
+          <div className="flex items-start gap-3">
+            <Eye className="w-5 h-5 text-slate-400 mt-0.5" />
+            <div>
+              <p className="text-sm text-slate-500">Visibility</p>
+              <div className="flex items-center gap-2">
+                <VisibilityIcon className="w-4 h-4 text-slate-600" />
+                <p className="font-medium text-slate-800 capitalize">{competition.visibility}</p>
+              </div>
+            </div>
+          </div>
+          <div className="flex items-start gap-3">
+            <Calendar className="w-5 h-5 text-slate-400 mt-0.5" />
+            <div>
+              <p className="text-sm text-slate-500">Competition Period</p>
+              <p className="font-medium text-slate-800">{formatDate(competition.starts_at)}</p>
+              {competition.ends_at && (
+                <p className="text-sm text-slate-600">to {formatDate(competition.ends_at)}</p>
+              )}
+            </div>
+          </div>
+          <div className="flex items-start gap-3">
+            <Users className="w-5 h-5 text-slate-400 mt-0.5" />
+            <div>
+              <p className="text-sm text-slate-500">Registration Period</p>
+              {competition.registration_open_at ? (
+                <>
+                  <p className="font-medium text-slate-800">
+                    Opens: {formatDate(competition.registration_open_at)}
+                  </p>
+                  {competition.registration_close_at && (
+                    <p className="text-sm text-slate-600">
+                      Closes: {formatDate(competition.registration_close_at)}
+                    </p>
+                  )}
+                </>
+              ) : (
+                <p className="font-medium text-slate-800">Not configured</p>
+              )}
+            </div>
+          </div>
+        </div>
+      </Card>
+
+      {/* Stages */}
+      <Card variant="bordered" padding="md">
+        <h3 className="text-lg font-semibold text-slate-800 mb-4">Stages</h3>
+        {competition.stages && competition.stages.length > 0 ? (
+          <div className="space-y-3">
+            {competition.stages
+              .sort((a, b) => a.stage_order - b.stage_order)
+              .map((stage, index) => (
+                <StageCard key={stage.stage_id} stage={stage} index={index} />
+              ))}
+          </div>
+        ) : (
+          <div className="text-center py-8">
+            <p className="text-slate-500">No stages configured yet.</p>
+            <p className="text-sm text-slate-400 mt-1">
+              Stages will be created based on the competition type and configuration.
+            </p>
+          </div>
+        )}
+      </Card>
+
+      {/* Configuration Preview */}
+      {competition.config_snapshot && (
+        <Card variant="bordered" padding="md" className="lg:col-span-2">
+          <h3 className="text-lg font-semibold text-slate-800 mb-4">Configuration</h3>
+          <div className="grid gap-4 md:grid-cols-3">
+            {competition.config_snapshot.ops?.registration && (
+              <div className="p-4 bg-slate-50 rounded-xl">
+                <h4 className="font-medium text-slate-800 mb-2">Registration</h4>
+                <div className="space-y-1 text-sm text-slate-600">
+                  <p>
+                    Approval:{' '}
+                    {competition.config_snapshot.ops.registration.requires_approval
+                      ? 'Required'
+                      : 'Auto-approve'}
+                  </p>
+                  {competition.config_snapshot.ops.registration.max_participants && (
+                    <p>
+                      Max participants: {competition.config_snapshot.ops.registration.max_participants}
+                    </p>
+                  )}
+                  <p>
+                    Waitlist:{' '}
+                    {competition.config_snapshot.ops.registration.waitlist_enabled
+                      ? 'Enabled'
+                      : 'Disabled'}
+                  </p>
+                </div>
+              </div>
+            )}
+            {competition.config_snapshot.rating && (
+              <div className="p-4 bg-slate-50 rounded-xl">
+                <h4 className="font-medium text-slate-800 mb-2">Rating</h4>
+                <div className="space-y-1 text-sm text-slate-600">
+                  <p>
+                    Affects rating:{' '}
+                    {competition.config_snapshot.rating.affects_rating ? 'Yes' : 'No'}
+                  </p>
+                  {competition.config_snapshot.rating.rating_weight && (
+                    <p>Weight: {competition.config_snapshot.rating.rating_weight}x</p>
+                  )}
+                </div>
+              </div>
+            )}
+            {competition.config_snapshot.format && (
+              <div className="p-4 bg-slate-50 rounded-xl">
+                <h4 className="font-medium text-slate-800 mb-2">Format</h4>
+                <div className="space-y-1 text-sm text-slate-600">
+                  {competition.config_snapshot.format.participant_type && (
+                    <p className="capitalize">
+                      Type: {competition.config_snapshot.format.participant_type}
+                    </p>
+                  )}
+                  {competition.config_snapshot.format.team_size && (
+                    <p>
+                      Team size: {competition.config_snapshot.format.team_size.min}-
+                      {competition.config_snapshot.format.team_size.max}
+                    </p>
+                  )}
+                </div>
+              </div>
+            )}
+          </div>
+        </Card>
+      )}
+    </div>
+  );
+}
diff --git a/src/app/[locale]/admin/clubs/[club_id]/competitions/[competition_id]/tabs/ParticipantsTab.tsx b/src/app/[locale]/admin/clubs/[club_id]/competitions/[competition_id]/tabs/ParticipantsTab.tsx
new file mode 100644
index 0000000..1ab0f45
--- /dev/null
+++ b/src/app/[locale]/admin/clubs/[club_id]/competitions/[competition_id]/tabs/ParticipantsTab.tsx
@@ -0,0 +1,203 @@
+'use client';
+
+import React, { useState } from 'react';
+import { Plus, Users, UserMinus, Hash, AlertCircle, Loader2 } from 'lucide-react';
+import Card from '@/src/components/cards/Card';
+import { useCompetitionParticipants } from '@/src/hooks/queries/useCompetitionQueries';
+import {
+  useSetParticipantSeed,
+  useWithdrawParticipant,
+} from '@/src/hooks/mutations/useCompetitionMutations';
+import type { CompetitionParticipant, ParticipantStatus } from '@/src/types/competition';
+
+interface ParticipantsTabProps {
+  competitionId: number;
+}
+
+const statusColors: Record<ParticipantStatus, string> = {
+  active: 'bg-emerald-100 text-emerald-700',
+  withdrawn: 'bg-slate-100 text-slate-500',
+  eliminated: 'bg-red-100 text-red-700',
+};
+
+function ParticipantRow({
+  participant,
+  competitionId,
+}: {
+  participant: CompetitionParticipant;
+  competitionId: number;
+}) {
+  const [isEditingSeed, setIsEditingSeed] = useState(false);
+  const [seedValue, setSeedValue] = useState(participant.seed?.toString() ?? '');
+
+  const setSeedMutation = useSetParticipantSeed(competitionId);
+  const withdrawMutation = useWithdrawParticipant(competitionId);
+
+  function handleSeedSave() {
+    const seed = parseInt(seedValue, 10);
+    if (!isNaN(seed) && seed > 0) {
+      setSeedMutation.mutate(
+        { participantId: participant.participant_id, seed },
+        { onSuccess: () => setIsEditingSeed(false) }
+      );
+    }
+  }
+
+  return (
+    <div className="flex items-center gap-4 p-4 bg-white border border-slate-200 rounded-xl">
+      {/* Seed */}
+      <div className="w-12 flex-shrink-0">
+        {isEditingSeed ? (
+          <div className="flex items-center gap-1">
+            <input
+              type="number"
+              value={seedValue}
+              onChange={(e) => setSeedValue(e.target.value)}
+              className="w-12 px-2 py-1 text-center text-sm border border-slate-200 rounded focus:outline-none focus:ring-1 focus:ring-purple-500"
+              min="1"
+              autoFocus
+              onKeyDown={(e) => {
+                if (e.key === 'Enter') handleSeedSave();
+                if (e.key === 'Escape') setIsEditingSeed(false);
+              }}
+              onBlur={handleSeedSave}
+            />
+          </div>
+        ) : (
+          <button
+            onClick={() => setIsEditingSeed(true)}
+            className="w-10 h-10 flex items-center justify-center bg-slate-100 rounded-lg text-slate-600 font-medium hover:bg-slate-200 transition-colors"
+            title="Click to set seed"
+          >
+            {participant.seed ?? <Hash className="w-4 h-4" />}
+          </button>
+        )}
+      </div>
+
+      {/* Info */}
+      <div className="flex-1 min-w-0">
+        <div className="flex items-center gap-2">
+          <h4 className="font-semibold text-slate-800 truncate">
+            {participant.display_name}
+          </h4>
+          <span
+            className={`text-xs px-2 py-0.5 rounded-full ${statusColors[participant.status]}`}
+          >
+            {participant.status}
+          </span>
+        </div>
+        <div className="flex items-center gap-2 mt-1 text-sm text-slate-600">
+          {participant.members && participant.members.length > 0 && (
+            <span>
+              {participant.members.map((m) => m.display_name).join(', ')}
+            </span>
+          )}
+          {participant.group_name && (
+            <>
+              <span className="text-slate-400">•</span>
+              <span>Group {participant.group_name}</span>
+            </>
+          )}
+        </div>
+      </div>
+
+      {/* Actions */}
+      {participant.status === 'active' && (
+        <button
+          onClick={() => withdrawMutation.mutate(participant.participant_id)}
+          disabled={withdrawMutation.isPending}
+          className="p-2 text-slate-400 hover:text-red-600 hover:bg-red-50 rounded-lg transition-colors disabled:opacity-50"
+          title="Withdraw participant"
+        >
+          {withdrawMutation.isPending ? (
+            <Loader2 className="w-5 h-5 animate-spin" />
+          ) : (
+            <UserMinus className="w-5 h-5" />
+          )}
+        </button>
+      )}
+    </div>
+  );
+}
+
+function ParticipantSkeleton() {
+  return (
+    <div className="flex items-center gap-4 p-4 bg-white border border-slate-200 rounded-xl">
+      <div className="w-10 h-10 bg-slate-200 rounded-lg animate-pulse" />
+      <div className="flex-1">
+        <div className="flex items-center gap-2 mb-2">
+          <div className="h-5 w-32 bg-slate-200 rounded animate-pulse" />
+          <div className="h-5 w-16 bg-slate-200 rounded-full animate-pulse" />
+        </div>
+        <div className="h-4 w-48 bg-slate-200 rounded animate-pulse" />
+      </div>
+    </div>
+  );
+}
+
+export default function ParticipantsTab({ competitionId }: ParticipantsTabProps) {
+  const [statusFilter, setStatusFilter] = useState<ParticipantStatus | 'all'>('all');
+
+  const { data: participants, isLoading, error } = useCompetitionParticipants(competitionId, {
+    status: statusFilter === 'all' ? undefined : statusFilter,
+  });
+
+  const activeCount = participants?.filter((p) => p.status === 'active').length ?? 0;
+
+  return (
+    <div>
+      {/* Header */}
+      <div className="flex items-center justify-between gap-4 mb-6">
+        <select
+          value={statusFilter}
+          onChange={(e) => setStatusFilter(e.target.value as ParticipantStatus | 'all')}
+          className="px-4 py-2 bg-white border border-slate-200 rounded-xl text-sm font-medium text-slate-700 focus:outline-none focus:ring-2 focus:ring-purple-500"
+        >
+          <option value="all">All ({participants?.length ?? 0})</option>
+          <option value="active">Active ({activeCount})</option>
+          <option value="withdrawn">Withdrawn</option>
+          <option value="eliminated">Eliminated</option>
+        </select>
+      </div>
+
+      {/* Error */}
+      {error && (
+        <div className="flex items-center gap-2 p-4 bg-red-50 border border-red-200 rounded-xl mb-6">
+          <AlertCircle className="w-5 h-5 text-red-600" />
+          <p className="text-red-700">Failed to load participants</p>
+        </div>
+      )}
+
+      {/* List */}
+      {isLoading ? (
+        <div className="space-y-3">
+          {[1, 2, 3, 4, 5, 6].map((i) => (
+            <ParticipantSkeleton key={i} />
+          ))}
+        </div>
+      ) : participants && participants.length > 0 ? (
+        <div className="space-y-3">
+          {participants
+            .sort((a, b) => (a.seed ?? 999) - (b.seed ?? 999))
+            .map((participant) => (
+              <ParticipantRow
+                key={participant.participant_id}
+                participant={participant}
+                competitionId={competitionId}
+              />
+            ))}
+        </div>
+      ) : (
+        <Card variant="bordered" padding="lg">
+          <div className="text-center py-8">
+            <Users className="w-12 h-12 text-slate-300 mx-auto mb-4" />
+            <h3 className="font-semibold text-slate-800 mb-1">No participants yet</h3>
+            <p className="text-slate-500">
+              Approve registrations to add participants to this competition.
+            </p>
+          </div>
+        </Card>
+      )}
+    </div>
+  );
+}
diff --git a/src/app/[locale]/admin/clubs/[club_id]/competitions/[competition_id]/tabs/RegistrationsTab.tsx b/src/app/[locale]/admin/clubs/[club_id]/competitions/[competition_id]/tabs/RegistrationsTab.tsx
new file mode 100644
index 0000000..9e44fe8
--- /dev/null
+++ b/src/app/[locale]/admin/clubs/[club_id]/competitions/[competition_id]/tabs/RegistrationsTab.tsx
@@ -0,0 +1,224 @@
+'use client';
+
+import React, { useState } from 'react';
+import { Check, X, Clock, UserCheck, UserX, Loader2, AlertCircle } from 'lucide-react';
+import Card from '@/src/components/cards/Card';
+import { useCompetitionRegistrations } from '@/src/hooks/queries/useCompetitionQueries';
+import {
+  useApproveRegistration,
+  useRejectRegistration,
+} from '@/src/hooks/mutations/useCompetitionMutations';
+import type { CompetitionRegistration, RegistrationStatus } from '@/src/types/competition';
+
+interface RegistrationsTabProps {
+  competitionId: number;
+}
+
+const statusConfig: Record<RegistrationStatus, {
+  label: string;
+  bgColor: string;
+  textColor: string;
+  Icon: React.ComponentType<{ className?: string }>;
+}> = {
+  pending: {
+    label: 'Pending',
+    bgColor: 'bg-amber-100',
+    textColor: 'text-amber-700',
+    Icon: Clock,
+  },
+  approved: {
+    label: 'Approved',
+    bgColor: 'bg-emerald-100',
+    textColor: 'text-emerald-700',
+    Icon: UserCheck,
+  },
+  rejected: {
+    label: 'Rejected',
+    bgColor: 'bg-red-100',
+    textColor: 'text-red-700',
+    Icon: UserX,
+  },
+  waitlisted: {
+    label: 'Waitlisted',
+    bgColor: 'bg-slate-100',
+    textColor: 'text-slate-700',
+    Icon: Clock,
+  },
+  withdrawn: {
+    label: 'Withdrawn',
+    bgColor: 'bg-gray-100',
+    textColor: 'text-gray-700',
+    Icon: X,
+  },
+};
+
+function RegistrationRow({
+  registration,
+  competitionId,
+}: {
+  registration: CompetitionRegistration;
+  competitionId: number;
+}) {
+  const approveMutation = useApproveRegistration(competitionId);
+  const rejectMutation = useRejectRegistration(competitionId);
+  const isPending = approveMutation.isPending || rejectMutation.isPending;
+
+  const config = statusConfig[registration.status];
+  const StatusIcon = config.Icon;
+
+  function formatDate(dateString: string): string {
+    const date = new Date(dateString);
+    return date.toLocaleDateString('en-US', {
+      month: 'short',
+      day: 'numeric',
+      hour: '2-digit',
+      minute: '2-digit',
+    });
+  }
+
+  return (
+    <div className="flex items-center gap-4 p-4 bg-white border border-slate-200 rounded-xl">
+      {/* User Info */}
+      <div className="flex-1 min-w-0">
+        <div className="flex items-center gap-2">
+          <h4 className="font-semibold text-slate-800 truncate">
+            {registration.team_name || registration.display_name}
+          </h4>
+          <span className={`inline-flex items-center gap-1 text-xs px-2 py-0.5 rounded-full ${config.bgColor} ${config.textColor}`}>
+            <StatusIcon className="w-3 h-3" />
+            {config.label}
+          </span>
+        </div>
+        <div className="flex flex-wrap items-center gap-2 mt-1 text-sm text-slate-600">
+          {registration.members && registration.members.length > 0 && (
+            <span>
+              {registration.members.map((m) => m.display_name).join(', ')}
+            </span>
+          )}
+          <span className="text-slate-400">•</span>
+          <span>{formatDate(registration.created_at)}</span>
+        </div>
+        {registration.notes && (
+          <p className="text-sm text-slate-500 mt-1 truncate">
+            {registration.notes}
+          </p>
+        )}
+      </div>
+
+      {/* Actions */}
+      {registration.status === 'pending' && (
+        <div className="flex items-center gap-2">
+          <button
+            onClick={() => approveMutation.mutate(registration.registration_id)}
+            disabled={isPending}
+            className="p-2 bg-emerald-100 text-emerald-700 rounded-lg hover:bg-emerald-200 transition-colors disabled:opacity-50"
+            title="Approve"
+          >
+            {approveMutation.isPending ? (
+              <Loader2 className="w-5 h-5 animate-spin" />
+            ) : (
+              <Check className="w-5 h-5" />
+            )}
+          </button>
+          <button
+            onClick={() => rejectMutation.mutate(registration.registration_id)}
+            disabled={isPending}
+            className="p-2 bg-red-100 text-red-700 rounded-lg hover:bg-red-200 transition-colors disabled:opacity-50"
+            title="Reject"
+          >
+            {rejectMutation.isPending ? (
+              <Loader2 className="w-5 h-5 animate-spin" />
+            ) : (
+              <X className="w-5 h-5" />
+            )}
+          </button>
+        </div>
+      )}
+    </div>
+  );
+}
+
+function RegistrationSkeleton() {
+  return (
+    <div className="flex items-center gap-4 p-4 bg-white border border-slate-200 rounded-xl">
+      <div className="flex-1">
+        <div className="flex items-center gap-2 mb-2">
+          <div className="h-5 w-32 bg-slate-200 rounded animate-pulse" />
+          <div className="h-5 w-16 bg-slate-200 rounded-full animate-pulse" />
+        </div>
+        <div className="h-4 w-48 bg-slate-200 rounded animate-pulse" />
+      </div>
+      <div className="flex gap-2">
+        <div className="w-9 h-9 bg-slate-200 rounded-lg animate-pulse" />
+        <div className="w-9 h-9 bg-slate-200 rounded-lg animate-pulse" />
+      </div>
+    </div>
+  );
+}
+
+export default function RegistrationsTab({ competitionId }: RegistrationsTabProps) {
+  const [statusFilter, setStatusFilter] = useState<RegistrationStatus | 'all'>('all');
+
+  const { data: registrations, isLoading, error } = useCompetitionRegistrations(competitionId, {
+    status: statusFilter === 'all' ? undefined : statusFilter,
+  });
+
+  const pendingCount = registrations?.filter((r) => r.status === 'pending').length ?? 0;
+
+  return (
+    <div>
+      {/* Filter */}
+      <div className="flex items-center gap-4 mb-6">
+        <select
+          value={statusFilter}
+          onChange={(e) => setStatusFilter(e.target.value as RegistrationStatus | 'all')}
+          className="px-4 py-2 bg-white border border-slate-200 rounded-xl text-sm font-medium text-slate-700 focus:outline-none focus:ring-2 focus:ring-purple-500"
+        >
+          <option value="all">All Statuses</option>
+          <option value="pending">Pending ({pendingCount})</option>
+          <option value="approved">Approved</option>
+          <option value="rejected">Rejected</option>
+          <option value="waitlisted">Waitlisted</option>
+          <option value="withdrawn">Withdrawn</option>
+        </select>
+      </div>
+
+      {/* Error */}
+      {error && (
+        <div className="flex items-center gap-2 p-4 bg-red-50 border border-red-200 rounded-xl mb-6">
+          <AlertCircle className="w-5 h-5 text-red-600" />
+          <p className="text-red-700">Failed to load registrations</p>
+        </div>
+      )}
+
+      {/* List */}
+      {isLoading ? (
+        <div className="space-y-3">
+          {[1, 2, 3, 4, 5].map((i) => (
+            <RegistrationSkeleton key={i} />
+          ))}
+        </div>
+      ) : registrations && registrations.length > 0 ? (
+        <div className="space-y-3">
+          {registrations.map((registration) => (
+            <RegistrationRow
+              key={registration.registration_id}
+              registration={registration}
+              competitionId={competitionId}
+            />
+          ))}
+        </div>
+      ) : (
+        <Card variant="bordered" padding="lg">
+          <div className="text-center py-8">
+            <Clock className="w-12 h-12 text-slate-300 mx-auto mb-4" />
+            <h3 className="font-semibold text-slate-800 mb-1">No registrations yet</h3>
+            <p className="text-slate-500">
+              Registrations will appear here when players sign up.
+            </p>
+          </div>
+        </Card>
+      )}
+    </div>
+  );
+}
diff --git a/src/app/[locale]/admin/clubs/[club_id]/competitions/[competition_id]/tabs/StandingsTab.tsx b/src/app/[locale]/admin/clubs/[club_id]/competitions/[competition_id]/tabs/StandingsTab.tsx
new file mode 100644
index 0000000..cedba59
--- /dev/null
+++ b/src/app/[locale]/admin/clubs/[club_id]/competitions/[competition_id]/tabs/StandingsTab.tsx
@@ -0,0 +1,317 @@
+'use client';
+
+import React, { useState } from 'react';
+import { RefreshCw, ListOrdered, AlertCircle, Loader2, Trophy } from 'lucide-react';
+import Card from '@/src/components/cards/Card';
+import {
+  useCompetitionStandings,
+  useCompetitionLeaderboard,
+} from '@/src/hooks/queries/useCompetitionQueries';
+import {
+  useRecalculateStandings,
+  useRecalculateLeaderboard,
+} from '@/src/hooks/mutations/useCompetitionMutations';
+import type { Competition, CompetitionStage, CompetitionStanding, LeaderboardEntry, LeaderboardStats } from '@/src/types/competition';
+
+interface StandingsTabProps {
+  competition: Competition;
+}
+
+function StandingsTable({
+  standings,
+  competitionId,
+  stageId,
+}: {
+  standings: CompetitionStanding[];
+  competitionId: number;
+  stageId: number;
+}) {
+  const recalculateMutation = useRecalculateStandings(competitionId, stageId);
+
+  return (
+    <div>
+      <div className="flex items-center justify-between mb-4">
+        <h4 className="font-semibold text-slate-700">Standings</h4>
+        <button
+          onClick={() => recalculateMutation.mutate(undefined)}
+          disabled={recalculateMutation.isPending}
+          className="inline-flex items-center px-3 py-1.5 text-sm bg-slate-100 text-slate-600 rounded-lg hover:bg-slate-200 transition-colors disabled:opacity-50"
+        >
+          {recalculateMutation.isPending ? (
+            <Loader2 className="w-4 h-4 mr-1.5 animate-spin" />
+          ) : (
+            <RefreshCw className="w-4 h-4 mr-1.5" />
+          )}
+          Recalculate
+        </button>
+      </div>
+
+      <div className="overflow-x-auto">
+        <table className="w-full">
+          <thead>
+            <tr className="border-b border-slate-200">
+              <th className="text-left text-xs font-semibold text-slate-500 uppercase py-3 px-4">#</th>
+              <th className="text-left text-xs font-semibold text-slate-500 uppercase py-3 px-4">Team</th>
+              <th className="text-center text-xs font-semibold text-slate-500 uppercase py-3 px-4">P</th>
+              <th className="text-center text-xs font-semibold text-slate-500 uppercase py-3 px-4">W</th>
+              <th className="text-center text-xs font-semibold text-slate-500 uppercase py-3 px-4">D</th>
+              <th className="text-center text-xs font-semibold text-slate-500 uppercase py-3 px-4">L</th>
+              <th className="text-center text-xs font-semibold text-slate-500 uppercase py-3 px-4">GD</th>
+              <th className="text-center text-xs font-semibold text-slate-500 uppercase py-3 px-4 bg-purple-50">Pts</th>
+            </tr>
+          </thead>
+          <tbody>
+            {standings
+              .sort((a, b) => a.rank - b.rank)
+              .map((standing, index) => (
+                <tr
+                  key={standing.standing_id}
+                  className={`border-b border-slate-100 ${
+                    index < 2 ? 'bg-emerald-50/50' : ''
+                  }`}
+                >
+                  <td className="py-3 px-4">
+                    <span className={`font-semibold ${index < 2 ? 'text-emerald-600' : 'text-slate-600'}`}>
+                      {standing.rank}
+                    </span>
+                  </td>
+                  <td className="py-3 px-4 font-medium text-slate-800">
+                    {standing.display_name}
+                  </td>
+                  <td className="py-3 px-4 text-center text-slate-600">{standing.played}</td>
+                  <td className="py-3 px-4 text-center text-emerald-600">{standing.won}</td>
+                  <td className="py-3 px-4 text-center text-amber-600">{standing.drawn}</td>
+                  <td className="py-3 px-4 text-center text-red-600">{standing.lost}</td>
+                  <td className="py-3 px-4 text-center text-slate-600">
+                    {standing.goal_difference > 0 ? '+' : ''}
+                    {standing.goal_difference}
+                  </td>
+                  <td className="py-3 px-4 text-center font-bold text-purple-700 bg-purple-50">
+                    {standing.points}
+                  </td>
+                </tr>
+              ))}
+          </tbody>
+        </table>
+      </div>
+    </div>
+  );
+}
+
+function LeaderboardTable({
+  leaderboardData,
+  competitionId,
+  stageId,
+}: {
+  leaderboardData: { leaderboard: LeaderboardEntry[]; stats: LeaderboardStats };
+  competitionId: number;
+  stageId: number;
+}) {
+  const recalculateMutation = useRecalculateLeaderboard(competitionId, stageId);
+  const entries = leaderboardData.leaderboard;
+
+  return (
+    <div>
+      <div className="flex items-center justify-between mb-4">
+        <h4 className="font-semibold text-slate-700">Leaderboard</h4>
+        <button
+          onClick={() => recalculateMutation.mutate(undefined)}
+          disabled={recalculateMutation.isPending}
+          className="inline-flex items-center px-3 py-1.5 text-sm bg-slate-100 text-slate-600 rounded-lg hover:bg-slate-200 transition-colors disabled:opacity-50"
+        >
+          {recalculateMutation.isPending ? (
+            <Loader2 className="w-4 h-4 mr-1.5 animate-spin" />
+          ) : (
+            <RefreshCw className="w-4 h-4 mr-1.5" />
+          )}
+          Recalculate
+        </button>
+      </div>
+
+      <div className="space-y-2">
+        {entries
+          .sort((a, b) => a.rank - b.rank)
+          .map((entry, index) => (
+            <div
+              key={entry.entry_id}
+              className={`flex items-center gap-4 p-4 rounded-xl ${
+                index === 0
+                  ? 'bg-gradient-to-r from-amber-100 to-amber-50 border border-amber-200'
+                  : index === 1
+                    ? 'bg-gradient-to-r from-slate-200 to-slate-100 border border-slate-300'
+                    : index === 2
+                      ? 'bg-gradient-to-r from-orange-100 to-orange-50 border border-orange-200'
+                      : 'bg-white border border-slate-200'
+              }`}
+            >
+              <div
+                className={`w-10 h-10 rounded-full flex items-center justify-center font-bold ${
+                  index === 0
+                    ? 'bg-amber-500 text-white'
+                    : index === 1
+                      ? 'bg-slate-400 text-white'
+                      : index === 2
+                        ? 'bg-orange-400 text-white'
+                        : 'bg-slate-100 text-slate-600'
+                }`}
+              >
+                {entry.rank}
+              </div>
+              <div className="flex-1">
+                <h5 className="font-semibold text-slate-800">{entry.display_name}</h5>
+                <p className="text-sm text-slate-500">
+                  {entry.matches_counted} matches counted
+                </p>
+              </div>
+              <div className="text-right">
+                <div className="text-2xl font-bold text-purple-600">
+                  {entry.metric_value > 0 ? '+' : ''}
+                  {entry.metric_value.toFixed(1)}
+                </div>
+                <p className="text-xs text-slate-500">Rating Delta</p>
+              </div>
+            </div>
+          ))}
+      </div>
+    </div>
+  );
+}
+
+function StageStandings({
+  stage,
+  competitionId,
+}: {
+  stage: CompetitionStage;
+  competitionId: number;
+}) {
+  const isChallenge = stage.stage_type === 'rating_delta_challenge';
+
+  const {
+    data: standings,
+    isLoading: standingsLoading,
+    error: standingsError,
+  } = useCompetitionStandings(competitionId, stage.stage_id, undefined);
+
+  const {
+    data: leaderboard,
+    isLoading: leaderboardLoading,
+    error: leaderboardError,
+  } = useCompetitionLeaderboard(competitionId, stage.stage_id);
+
+  const isLoading = isChallenge ? leaderboardLoading : standingsLoading;
+  const error = isChallenge ? leaderboardError : standingsError;
+
+  if (isLoading) {
+    return (
+      <div className="flex items-center justify-center py-12">
+        <Loader2 className="w-8 h-8 text-purple-600 animate-spin" />
+      </div>
+    );
+  }
+
+  if (error) {
+    return (
+      <div className="flex items-center gap-2 p-4 bg-red-50 border border-red-200 rounded-xl">
+        <AlertCircle className="w-5 h-5 text-red-600" />
+        <p className="text-red-700">Failed to load standings</p>
+      </div>
+    );
+  }
+
+  if (isChallenge) {
+    if (!leaderboard || leaderboard.leaderboard.length === 0) {
+      return (
+        <div className="text-center py-12">
+          <Trophy className="w-12 h-12 text-slate-300 mx-auto mb-4" />
+          <h4 className="font-semibold text-slate-800 mb-2">No leaderboard data</h4>
+          <p className="text-slate-500">
+            Leaderboard will populate as matches are completed.
+          </p>
+        </div>
+      );
+    }
+    return (
+      <LeaderboardTable
+        leaderboardData={leaderboard}
+        competitionId={competitionId}
+        stageId={stage.stage_id}
+      />
+    );
+  }
+
+  if (!standings || standings.length === 0) {
+    return (
+      <div className="text-center py-12">
+        <ListOrdered className="w-12 h-12 text-slate-300 mx-auto mb-4" />
+        <h4 className="font-semibold text-slate-800 mb-2">No standings yet</h4>
+        <p className="text-slate-500">
+          Standings will populate as matches are completed.
+        </p>
+      </div>
+    );
+  }
+
+  return (
+    <StandingsTable
+      standings={standings}
+      competitionId={competitionId}
+      stageId={stage.stage_id}
+    />
+  );
+}
+
+export default function StandingsTab({ competition }: StandingsTabProps) {
+  const stages = competition.stages ?? [];
+  const [selectedStageId, setSelectedStageId] = useState<number | null>(
+    stages[0]?.stage_id ?? null
+  );
+
+  const selectedStage = stages.find((s) => s.stage_id === selectedStageId);
+
+  if (stages.length === 0) {
+    return (
+      <Card variant="bordered" padding="lg">
+        <div className="text-center py-8">
+          <ListOrdered className="w-12 h-12 text-slate-300 mx-auto mb-4" />
+          <h3 className="font-semibold text-slate-800 mb-1">No stages configured</h3>
+          <p className="text-slate-500">
+            Configure stages in the competition settings to view standings.
+          </p>
+        </div>
+      </Card>
+    );
+  }
+
+  return (
+    <div>
+      {/* Stage Selector */}
+      {stages.length > 1 && (
+        <div className="flex gap-2 mb-6 overflow-x-auto pb-2">
+          {stages
+            .sort((a, b) => a.stage_order - b.stage_order)
+            .map((stage) => (
+              <button
+                key={stage.stage_id}
+                onClick={() => setSelectedStageId(stage.stage_id)}
+                className={`px-4 py-2 rounded-xl font-medium whitespace-nowrap transition-colors ${
+                  selectedStageId === stage.stage_id
+                    ? 'bg-purple-100 text-purple-700'
+                    : 'bg-slate-100 text-slate-600 hover:bg-slate-200'
+                }`}
+              >
+                {stage.name}
+              </button>
+            ))}
+        </div>
+      )}
+
+      {/* Standings */}
+      {selectedStage && (
+        <StageStandings
+          stage={selectedStage}
+          competitionId={competition.competition_id}
+        />
+      )}
+    </div>
+  );
+}
diff --git a/src/app/[locale]/admin/clubs/[club_id]/competitions/page.tsx b/src/app/[locale]/admin/clubs/[club_id]/competitions/page.tsx
new file mode 100644
index 0000000..10fc16e
--- /dev/null
+++ b/src/app/[locale]/admin/clubs/[club_id]/competitions/page.tsx
@@ -0,0 +1,12 @@
+import CompetitionsPageComponent from './CompetitionsPageComponent';
+
+export default async function CompetitionsPage({
+  params,
+}: {
+  params: Promise<{ club_id: string }>;
+}) {
+  const { club_id } = await params;
+  const clubId = parseInt(club_id, 10);
+
+  return <CompetitionsPageComponent clubId={clubId} />;
+}
diff --git a/src/app/[locale]/admin/clubs/[club_id]/competitions/templates/CreateTemplateModal.tsx b/src/app/[locale]/admin/clubs/[club_id]/competitions/templates/CreateTemplateModal.tsx
new file mode 100644
index 0000000..9ac9abe
--- /dev/null
+++ b/src/app/[locale]/admin/clubs/[club_id]/competitions/templates/CreateTemplateModal.tsx
@@ -0,0 +1,265 @@
+'use client';
+
+import React, { useState, useEffect } from 'react';
+import { Trophy, Target, Zap, Layers, Loader2, AlertCircle } from 'lucide-react';
+import Modal from '@/src/components/modals/Modal';
+import ModalHeader from '@/src/components/modals/ModalHeader';
+import ModalBody from '@/src/components/modals/ModalBody';
+import ModalFooter from '@/src/components/modals/ModalFooter';
+import { useCreateTemplate } from '@/src/hooks/mutations/useCompetitionMutations';
+import type { CompetitionType, CreateTemplateRequest, StageType } from '@/src/types/competition';
+
+interface CreateTemplateModalProps {
+  isOpen: boolean;
+  onClose: () => void;
+  facilityId: number;
+}
+
+const competitionTypes: {
+  type: CompetitionType;
+  label: string;
+  description: string;
+  Icon: React.ComponentType<{ className?: string }>;
+  defaultStageType: StageType;
+}[] = [
+  {
+    type: 'league',
+    label: 'League',
+    description: 'Round-robin format with standings',
+    Icon: Trophy,
+    defaultStageType: 'round_robin',
+  },
+  {
+    type: 'tournament',
+    label: 'Tournament',
+    description: 'Knockout bracket format',
+    Icon: Target,
+    defaultStageType: 'knockout_single',
+  },
+  {
+    type: 'challenge',
+    label: 'Challenge',
+    description: 'Rating-based leaderboard',
+    Icon: Zap,
+    defaultStageType: 'rating_delta_challenge',
+  },
+  {
+    type: 'hybrid',
+    label: 'Hybrid',
+    description: 'Multiple stages combined',
+    Icon: Layers,
+    defaultStageType: 'group_stage',
+  },
+];
+
+export default function CreateTemplateModal({
+  isOpen,
+  onClose,
+  facilityId,
+}: CreateTemplateModalProps) {
+  const [formData, setFormData] = useState({
+    type: 'tournament' as CompetitionType,
+    name: '',
+    description: '',
+    sport_id: 1, // Default to padel
+  });
+  const [formError, setFormError] = useState<string | null>(null);
+
+  const createMutation = useCreateTemplate(facilityId);
+
+  // Reset form when modal closes
+  useEffect(() => {
+    if (!isOpen) {
+      setFormData({
+        type: 'tournament',
+        name: '',
+        description: '',
+        sport_id: 1,
+      });
+      setFormError(null);
+    }
+  }, [isOpen]);
+
+  async function handleSubmit(e: React.FormEvent) {
+    e.preventDefault();
+    setFormError(null);
+
+    if (!formData.name.trim()) {
+      setFormError('Name is required');
+      return;
+    }
+
+    const selectedType = competitionTypes.find((t) => t.type === formData.type);
+    if (!selectedType) {
+      setFormError('Invalid competition type');
+      return;
+    }
+
+    const request: CreateTemplateRequest = {
+      type: formData.type,
+      scope: 'facility',
+      sport_id: formData.sport_id,
+      name: formData.name.trim(),
+      description: formData.description.trim() || undefined,
+      config: {
+        format: {
+          stages: [
+            {
+              legs: formData.type === 'league' ? 2 : undefined,
+              points_win: formData.type === 'league' ? 3 : undefined,
+              points_draw: formData.type === 'league' ? 1 : undefined,
+              points_loss: formData.type === 'league' ? 0 : undefined,
+              third_place_match: formData.type === 'tournament' ? false : undefined,
+              leaderboard_metric:
+                formData.type === 'challenge' ? 'rating_delta_sum' : undefined,
+              min_matches: formData.type === 'challenge' ? 3 : undefined,
+            },
+          ],
+        },
+        ops: {
+          registration: {
+            requires_approval: true,
+            waitlist_enabled: true,
+          },
+        },
+        rating: {
+          affects_rating: true,
+          rating_weight: 1.0,
+        },
+      },
+    };
+
+    try {
+      await createMutation.mutateAsync(request);
+      onClose();
+    } catch (err) {
+      setFormError(err instanceof Error ? err.message : 'Failed to create template');
+    }
+  }
+
+  return (
+    <Modal isOpen={isOpen} onClose={onClose} size="lg">
+      <ModalHeader
+        title="Create Template"
+        subtitle="Create a reusable competition configuration"
+        onClose={onClose}
+      />
+      <form onSubmit={handleSubmit}>
+        <ModalBody padding="md">
+          <div className="space-y-5">
+            {formError && (
+              <div className="flex items-center gap-2 p-3 bg-red-50 border border-red-200 rounded-xl">
+                <AlertCircle className="w-5 h-5 text-red-600 flex-shrink-0" />
+                <p className="text-sm text-red-700">{formError}</p>
+              </div>
+            )}
+
+            {/* Competition Type */}
+            <div>
+              <label className="block text-sm font-medium text-slate-700 mb-2">
+                Type <span className="text-red-500">*</span>
+              </label>
+              <div className="grid grid-cols-2 gap-3">
+                {competitionTypes.map(({ type, label, description, Icon }) => (
+                  <button
+                    key={type}
+                    type="button"
+                    onClick={() => setFormData((prev) => ({ ...prev, type }))}
+                    className={`flex items-center gap-3 p-4 border rounded-xl text-left transition-colors ${
+                      formData.type === type
+                        ? 'border-purple-500 bg-purple-50'
+                        : 'border-slate-200 hover:border-slate-300'
+                    }`}
+                  >
+                    <div
+                      className={`w-10 h-10 rounded-lg flex items-center justify-center ${
+                        formData.type === type
+                          ? 'bg-purple-100'
+                          : 'bg-slate-100'
+                      }`}
+                    >
+                      <Icon
+                        className={`w-5 h-5 ${
+                          formData.type === type
+                            ? 'text-purple-600'
+                            : 'text-slate-500'
+                        }`}
+                      />
+                    </div>
+                    <div>
+                      <div
+                        className={`font-semibold ${
+                          formData.type === type
+                            ? 'text-purple-700'
+                            : 'text-slate-800'
+                        }`}
+                      >
+                        {label}
+                      </div>
+                      <div className="text-xs text-slate-500">{description}</div>
+                    </div>
+                  </button>
+                ))}
+              </div>
+            </div>
+
+            {/* Name */}
+            <div>
+              <label className="block text-sm font-medium text-slate-700 mb-1.5">
+                Name <span className="text-red-500">*</span>
+              </label>
+              <input
+                type="text"
+                value={formData.name}
+                onChange={(e) =>
+                  setFormData((prev) => ({ ...prev, name: e.target.value }))
+                }
+                placeholder="e.g., Standard Tournament (8 players)"
+                className="w-full px-4 py-2.5 border border-slate-200 rounded-xl focus:outline-none focus:ring-2 focus:ring-purple-500 focus:border-transparent"
+              />
+            </div>
+
+            {/* Description */}
+            <div>
+              <label className="block text-sm font-medium text-slate-700 mb-1.5">
+                Description
+              </label>
+              <textarea
+                value={formData.description}
+                onChange={(e) =>
+                  setFormData((prev) => ({ ...prev, description: e.target.value }))
+                }
+                placeholder="Describe the template configuration..."
+                rows={3}
+                className="w-full px-4 py-2.5 border border-slate-200 rounded-xl focus:outline-none focus:ring-2 focus:ring-purple-500 focus:border-transparent resize-none"
+              />
+            </div>
+          </div>
+        </ModalBody>
+        <ModalFooter align="right">
+          <button
+            type="button"
+            onClick={onClose}
+            className="px-4 py-2.5 bg-slate-100 text-slate-700 font-semibold rounded-xl hover:bg-slate-200 transition-colors"
+          >
+            Cancel
+          </button>
+          <button
+            type="submit"
+            disabled={createMutation.isPending}
+            className="px-6 py-2.5 bg-gradient-to-r from-indigo-600 via-purple-600 to-pink-600 text-white font-semibold rounded-xl hover:shadow-lg transition-all disabled:opacity-50 disabled:cursor-not-allowed"
+          >
+            {createMutation.isPending ? (
+              <span className="flex items-center gap-2">
+                <Loader2 className="w-4 h-4 animate-spin" />
+                Creating...
+              </span>
+            ) : (
+              'Create Template'
+            )}
+          </button>
+        </ModalFooter>
+      </form>
+    </Modal>
+  );
+}
diff --git a/src/app/[locale]/admin/clubs/[club_id]/competitions/templates/TemplatesPageComponent.tsx b/src/app/[locale]/admin/clubs/[club_id]/competitions/templates/TemplatesPageComponent.tsx
new file mode 100644
index 0000000..7d05b65
--- /dev/null
+++ b/src/app/[locale]/admin/clubs/[club_id]/competitions/templates/TemplatesPageComponent.tsx
@@ -0,0 +1,236 @@
+'use client';
+
+import React, { useState } from 'react';
+import Link from 'next/link';
+import { ArrowLeft, Plus, Trophy, Target, Zap, Layers, MoreVertical, Pencil, Trash2, Eye, EyeOff } from 'lucide-react';
+import useTranslation from '@/src/hooks/useTranslation';
+import Card from '@/src/components/cards/Card';
+import { useCompetitionTemplates } from '@/src/hooks/queries/useCompetitionQueries';
+import { useUpdateTemplate } from '@/src/hooks/mutations/useCompetitionMutations';
+import CreateTemplateModal from './CreateTemplateModal';
+import type { CompetitionTemplate, CompetitionType } from '@/src/types/competition';
+
+interface TemplatesPageComponentProps {
+  clubId: number;
+}
+
+const typeIcons: Record<CompetitionType, React.ComponentType<{ className?: string }>> = {
+  league: Trophy,
+  tournament: Target,
+  challenge: Zap,
+  hybrid: Layers,
+};
+
+const typeColors: Record<CompetitionType, string> = {
+  league: 'bg-amber-100 text-amber-700',
+  tournament: 'bg-purple-100 text-purple-700',
+  challenge: 'bg-pink-100 text-pink-700',
+  hybrid: 'bg-indigo-100 text-indigo-700',
+};
+
+function TemplateCard({
+  template,
+  onToggleActive,
+}: {
+  template: CompetitionTemplate;
+  onToggleActive: () => void;
+}) {
+  const [showMenu, setShowMenu] = useState(false);
+  const Icon = typeIcons[template.type];
+
+  return (
+    <Card variant="bordered" padding="none" className="overflow-visible">
+      <div className="p-5">
+        <div className="flex items-start justify-between gap-3 mb-3">
+          <div className={`w-10 h-10 rounded-lg flex items-center justify-center ${typeColors[template.type]}`}>
+            <Icon className="w-5 h-5" />
+          </div>
+          <div className="relative">
+            <button
+              onClick={() => setShowMenu(!showMenu)}
+              className="p-2 hover:bg-slate-100 rounded-lg transition-colors"
+            >
+              <MoreVertical className="w-4 h-4 text-slate-500" />
+            </button>
+            {showMenu && (
+              <>
+                <div
+                  className="fixed inset-0 z-10"
+                  onClick={() => setShowMenu(false)}
+                />
+                <div className="absolute right-0 top-full mt-1 w-48 bg-white border border-slate-200 rounded-xl shadow-lg z-20 py-1">
+                  <button
+                    onClick={() => {
+                      setShowMenu(false);
+                      // TODO: Open edit modal
+                    }}
+                    className="w-full flex items-center gap-2 px-4 py-2 text-sm text-slate-700 hover:bg-slate-50"
+                  >
+                    <Pencil className="w-4 h-4" />
+                    Edit Template
+                  </button>
+                  <button
+                    onClick={() => {
+                      setShowMenu(false);
+                      onToggleActive();
+                    }}
+                    className="w-full flex items-center gap-2 px-4 py-2 text-sm text-slate-700 hover:bg-slate-50"
+                  >
+                    {template.is_active ? (
+                      <>
+                        <EyeOff className="w-4 h-4" />
+                        Deactivate
+                      </>
+                    ) : (
+                      <>
+                        <Eye className="w-4 h-4" />
+                        Activate
+                      </>
+                    )}
+                  </button>
+                </div>
+              </>
+            )}
+          </div>
+        </div>
+
+        <h3 className="text-lg font-semibold text-slate-800 mb-1">
+          {template.name}
+        </h3>
+        {template.description && (
+          <p className="text-sm text-slate-600 mb-3 line-clamp-2">
+            {template.description}
+          </p>
+        )}
+
+        <div className="flex items-center gap-2 flex-wrap">
+          <span className={`text-xs px-2 py-1 rounded-full capitalize ${typeColors[template.type]}`}>
+            {template.type}
+          </span>
+          {!template.is_active && (
+            <span className="text-xs px-2 py-1 rounded-full bg-slate-100 text-slate-500">
+              Inactive
+            </span>
+          )}
+          {template.scope === 'platform' && (
+            <span className="text-xs px-2 py-1 rounded-full bg-indigo-100 text-indigo-700">
+              Platform
+            </span>
+          )}
+        </div>
+      </div>
+    </Card>
+  );
+}
+
+function TemplateCardSkeleton() {
+  return (
+    <Card variant="bordered" padding="none">
+      <div className="p-5">
+        <div className="flex items-start justify-between gap-3 mb-3">
+          <div className="w-10 h-10 bg-slate-200 rounded-lg animate-pulse" />
+          <div className="w-8 h-8 bg-slate-200 rounded-lg animate-pulse" />
+        </div>
+        <div className="h-6 w-3/4 bg-slate-200 rounded mb-2 animate-pulse" />
+        <div className="h-4 w-full bg-slate-200 rounded mb-3 animate-pulse" />
+        <div className="flex gap-2">
+          <div className="h-5 w-16 bg-slate-200 rounded-full animate-pulse" />
+        </div>
+      </div>
+    </Card>
+  );
+}
+
+export default function TemplatesPageComponent({ clubId }: TemplatesPageComponentProps) {
+  const { locale } = useTranslation();
+  const [isCreateModalOpen, setIsCreateModalOpen] = useState(false);
+
+  const { data: templates, isLoading, error } = useCompetitionTemplates(clubId);
+  const updateMutation = useUpdateTemplate();
+
+  function handleToggleActive(template: CompetitionTemplate) {
+    updateMutation.mutate({
+      templateId: template.template_id,
+      data: { is_active: !template.is_active },
+    });
+  }
+
+  return (
+    <div>
+      {/* Page Header */}
+      <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-4 mb-8">
+        <div>
+          <Link
+            href={`/${locale}/admin/clubs/${clubId}/competitions`}
+            className="inline-flex items-center text-slate-600 hover:text-slate-900 font-medium transition-colors mb-2"
+          >
+            <ArrowLeft className="w-4 h-4 mr-2" />
+            Back to Competitions
+          </Link>
+          <h2 className="text-2xl font-bold text-slate-900">Competition Templates</h2>
+          <p className="text-slate-600 mt-1">
+            Reusable configurations for creating competitions
+          </p>
+        </div>
+        <button
+          onClick={() => setIsCreateModalOpen(true)}
+          className="inline-flex items-center px-4 py-2.5 bg-gradient-to-r from-indigo-600 via-purple-600 to-pink-600 text-white font-semibold rounded-xl hover:shadow-lg transition-all"
+        >
+          <Plus className="w-5 h-5 mr-2" />
+          New Template
+        </button>
+      </div>
+
+      {/* Error State */}
+      {error && (
+        <div className="bg-red-50 border border-red-200 rounded-xl p-4 mb-6">
+          <p className="text-red-700 font-medium">
+            Failed to load templates. Please try again.
+          </p>
+        </div>
+      )}
+
+      {/* Templates Grid */}
+      {isLoading ? (
+        <div className="grid gap-4 md:grid-cols-2 lg:grid-cols-3">
+          {[1, 2, 3, 4, 5, 6].map((i) => (
+            <TemplateCardSkeleton key={i} />
+          ))}
+        </div>
+      ) : templates && templates.length > 0 ? (
+        <div className="grid gap-4 md:grid-cols-2 lg:grid-cols-3">
+          {templates.map((template) => (
+            <TemplateCard
+              key={template.template_id}
+              template={template}
+              onToggleActive={() => handleToggleActive(template)}
+            />
+          ))}
+        </div>
+      ) : (
+        <div className="flex flex-col items-center justify-center py-16">
+          <div className="w-16 h-16 bg-slate-100 rounded-full flex items-center justify-center mb-4">
+            <Trophy className="w-8 h-8 text-slate-400" />
+          </div>
+          <p className="text-slate-600 text-center mb-4">
+            No templates yet. Create your first template to get started.
+          </p>
+          <button
+            onClick={() => setIsCreateModalOpen(true)}
+            className="inline-flex items-center px-4 py-2.5 bg-gradient-to-r from-indigo-600 via-purple-600 to-pink-600 text-white font-semibold rounded-xl hover:shadow-lg transition-all"
+          >
+            <Plus className="w-5 h-5 mr-2" />
+            Create Template
+          </button>
+        </div>
+      )}
+
+      {/* Create Template Modal */}
+      <CreateTemplateModal
+        isOpen={isCreateModalOpen}
+        onClose={() => setIsCreateModalOpen(false)}
+        facilityId={clubId}
+      />
+    </div>
+  );
+}
diff --git a/src/app/[locale]/admin/clubs/[club_id]/competitions/templates/page.tsx b/src/app/[locale]/admin/clubs/[club_id]/competitions/templates/page.tsx
new file mode 100644
index 0000000..41f3efd
--- /dev/null
+++ b/src/app/[locale]/admin/clubs/[club_id]/competitions/templates/page.tsx
@@ -0,0 +1,12 @@
+import TemplatesPageComponent from './TemplatesPageComponent';
+
+export default async function TemplatesPage({
+  params,
+}: {
+  params: Promise<{ club_id: string }>;
+}) {
+  const { club_id } = await params;
+  const clubId = parseInt(club_id, 10);
+
+  return <TemplatesPageComponent clubId={clubId} />;
+}
diff --git a/src/components/ClubTabNavigation.tsx b/src/components/ClubTabNavigation.tsx
index 8e6a93e..28725d9 100644
--- a/src/components/ClubTabNavigation.tsx
+++ b/src/components/ClubTabNavigation.tsx
@@ -27,6 +27,7 @@ export default function ClubTabNavigation({ clubId }: ClubTabNavigationProps) {
     { key: 'slot-instances', label: 'Slot Instances', href: `${basePath}/slot-instances` },
     { key: 'plans', label: 'Plans', href: `${basePath}/plans` },
     { key: 'members', label: 'Members', href: `${basePath}/members` },
+    { key: 'competitions', label: 'Competitions', href: `${basePath}/competitions` },
     { key: 'settings', label: 'Settings', href: `${basePath}/settings` },
     { key: 'credits', label: 'Credits', href: `${basePath}/credits` },
     { key: 'transfers', label: 'Transfers', href: `${basePath}/transfers` },
diff --git a/src/components/competitions/CompetitionCard.tsx b/src/components/competitions/CompetitionCard.tsx
new file mode 100644
index 0000000..62cc1b8
--- /dev/null
+++ b/src/components/competitions/CompetitionCard.tsx
@@ -0,0 +1,105 @@
+'use client';
+
+import React from 'react';
+import Link from 'next/link';
+import { Calendar, Users, MapPin, ChevronRight } from 'lucide-react';
+import Card from '@/src/components/cards/Card';
+import CompetitionStatusBadge from './CompetitionStatusBadge';
+import CompetitionTypeBadge from './CompetitionTypeBadge';
+import type { Competition } from '@/src/types/competition';
+
+interface CompetitionCardProps {
+  competition: Competition;
+  facilityId: number;
+  className?: string;
+}
+
+function formatDate(dateString: string): string {
+  const date = new Date(dateString);
+  return date.toLocaleDateString('en-US', {
+    month: 'short',
+    day: 'numeric',
+    year: 'numeric',
+  });
+}
+
+function formatDateRange(startDate: string, endDate: string | null): string {
+  const start = formatDate(startDate);
+  if (!endDate) return start;
+  const end = formatDate(endDate);
+  return `${start} - ${end}`;
+}
+
+export default function CompetitionCard({
+  competition,
+  facilityId,
+  className = '',
+}: CompetitionCardProps) {
+  const href = `/facility/${facilityId}/competitions/${competition.competition_id}`;
+
+  return (
+    <Link href={href} className={`block group ${className}`}>
+      <Card
+        variant="bordered"
+        padding="none"
+        hover
+        className="overflow-hidden"
+      >
+        <div className="p-5">
+          {/* Header with badges */}
+          <div className="flex items-start justify-between gap-3 mb-3">
+            <div className="flex items-center gap-2 flex-wrap">
+              <CompetitionTypeBadge type={competition.type} size="xs" />
+              <CompetitionStatusBadge status={competition.status} size="xs" />
+            </div>
+            <ChevronRight className="w-5 h-5 text-slate-400 group-hover:text-purple-600 transition-colors flex-shrink-0" />
+          </div>
+
+          {/* Title */}
+          <h3 className="text-lg font-semibold text-slate-800 mb-2 group-hover:text-purple-700 transition-colors line-clamp-2">
+            {competition.title}
+          </h3>
+
+          {/* Description */}
+          {competition.description && (
+            <p className="text-sm text-slate-600 mb-4 line-clamp-2">
+              {competition.description}
+            </p>
+          )}
+
+          {/* Meta info */}
+          <div className="flex flex-wrap gap-4 text-sm text-slate-500">
+            <div className="flex items-center gap-1.5">
+              <Calendar className="w-4 h-4" />
+              <span>{formatDateRange(competition.starts_at, competition.ends_at)}</span>
+            </div>
+            {competition.participant_count !== undefined && (
+              <div className="flex items-center gap-1.5">
+                <Users className="w-4 h-4" />
+                <span>{competition.participant_count} participants</span>
+              </div>
+            )}
+            {competition.scope !== 'facility' && (
+              <div className="flex items-center gap-1.5">
+                <MapPin className="w-4 h-4" />
+                <span className="capitalize">{competition.scope.replace('_', ' ')}</span>
+              </div>
+            )}
+          </div>
+        </div>
+
+        {/* Registration status bar for published competitions */}
+        {competition.status === 'published' && competition.registration_count !== undefined && (
+          <div className="px-5 py-3 bg-slate-50 border-t border-slate-100">
+            <div className="flex items-center justify-between text-sm">
+              <span className="text-slate-600">Registrations</span>
+              <span className="font-medium text-slate-800">
+                {competition.registration_count} pending
+              </span>
+            </div>
+          </div>
+        )}
+      </Card>
+    </Link>
+  );
+}
diff --git a/src/components/competitions/CompetitionCardSkeleton.tsx b/src/components/competitions/CompetitionCardSkeleton.tsx
new file mode 100644
index 0000000..88b0538
--- /dev/null
+++ b/src/components/competitions/CompetitionCardSkeleton.tsx
@@ -0,0 +1,56 @@
+import React from 'react';
+import Card from '@/src/components/cards/Card';
+
+interface CompetitionCardSkeletonProps {
+  showRegistrationBar?: boolean;
+}
+
+export default function CompetitionCardSkeleton({
+  showRegistrationBar = false,
+}: CompetitionCardSkeletonProps) {
+  return (
+    <Card variant="bordered" padding="none" className="overflow-hidden">
+      <div className="p-5">
+        {/* Header with badges */}
+        <div className="flex items-start justify-between gap-3 mb-3">
+          <div className="flex items-center gap-2">
+            <div className="h-6 w-20 bg-slate-200 rounded-full animate-pulse" />
+            <div className="h-6 w-16 bg-slate-200 rounded-full animate-pulse" />
+          </div>
+          <div className="w-5 h-5 bg-slate-200 rounded animate-pulse" />
+        </div>
+
+        {/* Title */}
+        <div className="h-6 w-3/4 bg-slate-200 rounded-lg mb-2 animate-pulse" />
+
+        {/* Description */}
+        <div className="space-y-1 mb-4">
+          <div className="h-4 w-full bg-slate-200 rounded animate-pulse" />
+          <div className="h-4 w-2/3 bg-slate-200 rounded animate-pulse" />
+        </div>
+
+        {/* Meta info */}
+        <div className="flex gap-4">
+          <div className="flex items-center gap-1.5">
+            <div className="w-4 h-4 bg-slate-200 rounded animate-pulse" />
+            <div className="h-4 w-24 bg-slate-200 rounded animate-pulse" />
+          </div>
+          <div className="flex items-center gap-1.5">
+            <div className="w-4 h-4 bg-slate-200 rounded animate-pulse" />
+            <div className="h-4 w-20 bg-slate-200 rounded animate-pulse" />
+          </div>
+        </div>
+      </div>
+
+      {/* Registration status bar */}
+      {showRegistrationBar && (
+        <div className="px-5 py-3 bg-slate-50 border-t border-slate-100">
+          <div className="flex items-center justify-between">
+            <div className="h-4 w-20 bg-slate-200 rounded animate-pulse" />
+            <div className="h-4 w-16 bg-slate-200 rounded animate-pulse" />
+          </div>
+        </div>
+      )}
+    </Card>
+  );
+}
diff --git a/src/components/competitions/CompetitionList.tsx b/src/components/competitions/CompetitionList.tsx
new file mode 100644
index 0000000..d442ce3
--- /dev/null
+++ b/src/components/competitions/CompetitionList.tsx
@@ -0,0 +1,56 @@
+'use client';
+
+import React from 'react';
+import { Trophy } from 'lucide-react';
+import CompetitionCard from './CompetitionCard';
+import CompetitionCardSkeleton from './CompetitionCardSkeleton';
+import type { Competition } from '@/src/types/competition';
+
+interface CompetitionListProps {
+  competitions: Competition[];
+  facilityId: number;
+  isLoading?: boolean;
+  emptyMessage?: string;
+  className?: string;
+}
+
+export default function CompetitionList({
+  competitions,
+  facilityId,
+  isLoading = false,
+  emptyMessage = 'No competitions found',
+  className = '',
+}: CompetitionListProps) {
+  if (isLoading) {
+    return (
+      <div className={`grid gap-4 md:grid-cols-2 lg:grid-cols-3 ${className}`}>
+        {[1, 2, 3, 4, 5, 6].map((i) => (
+          <CompetitionCardSkeleton key={i} showRegistrationBar={i % 2 === 0} />
+        ))}
+      </div>
+    );
+  }
+
+  if (competitions.length === 0) {
+    return (
+      <div className={`flex flex-col items-center justify-center py-16 ${className}`}>
+        <div className="w-16 h-16 bg-slate-100 rounded-full flex items-center justify-center mb-4">
+          <Trophy className="w-8 h-8 text-slate-400" />
+        </div>
+        <p className="text-slate-600 text-center">{emptyMessage}</p>
+      </div>
+    );
+  }
+
+  return (
+    <div className={`grid gap-4 md:grid-cols-2 lg:grid-cols-3 ${className}`}>
+      {competitions.map((competition) => (
+        <CompetitionCard
+          key={competition.competition_id}
+          competition={competition}
+          facilityId={facilityId}
+        />
+      ))}
+    </div>
+  );
+}
diff --git a/src/components/competitions/CompetitionStatusBadge.tsx b/src/components/competitions/CompetitionStatusBadge.tsx
new file mode 100644
index 0000000..a29db5e
--- /dev/null
+++ b/src/components/competitions/CompetitionStatusBadge.tsx
@@ -0,0 +1,97 @@
+import React from 'react';
+import type { CompetitionStatus } from '@/src/types/competition';
+
+interface CompetitionStatusBadgeProps {
+  status: CompetitionStatus;
+  size?: 'xs' | 'sm' | 'md';
+  showDot?: boolean;
+  className?: string;
+}
+
+const statusConfig: Record<CompetitionStatus, {
+  label: string;
+  bgColor: string;
+  textColor: string;
+  dotColor: string;
+}> = {
+  draft: {
+    label: 'Draft',
+    bgColor: 'bg-slate-100',
+    textColor: 'text-slate-700',
+    dotColor: 'bg-slate-400',
+  },
+  published: {
+    label: 'Published',
+    bgColor: 'bg-indigo-50',
+    textColor: 'text-indigo-700',
+    dotColor: 'bg-indigo-500',
+  },
+  running: {
+    label: 'Running',
+    bgColor: 'bg-emerald-50',
+    textColor: 'text-emerald-700',
+    dotColor: 'bg-emerald-500',
+  },
+  finished: {
+    label: 'Finished',
+    bgColor: 'bg-purple-50',
+    textColor: 'text-purple-700',
+    dotColor: 'bg-purple-500',
+  },
+  cancelled: {
+    label: 'Cancelled',
+    bgColor: 'bg-red-50',
+    textColor: 'text-red-700',
+    dotColor: 'bg-red-500',
+  },
+};
+
+const sizeClasses = {
+  xs: {
+    padding: 'px-2 py-0.5',
+    text: 'text-xs',
+    dot: 'w-1.5 h-1.5',
+  },
+  sm: {
+    padding: 'px-2.5 py-1',
+    text: 'text-sm',
+    dot: 'w-2 h-2',
+  },
+  md: {
+    padding: 'px-3 py-1.5',
+    text: 'text-sm',
+    dot: 'w-2 h-2',
+  },
+};
+
+export default function CompetitionStatusBadge({
+  status,
+  size = 'sm',
+  showDot = true,
+  className = '',
+}: CompetitionStatusBadgeProps) {
+  const config = statusConfig[status];
+  const sizes = sizeClasses[size];
+
+  return (
+    <span
+      className={`
+        inline-flex items-center gap-1.5
+        ${sizes.padding}
+        ${config.bgColor}
+        ${config.textColor}
+        rounded-full
+        ${sizes.text}
+        font-medium
+        ${className}
+      `}
+    >
+      {showDot && (
+        <span
+          className={`${sizes.dot} ${config.dotColor} rounded-full ${status === 'running' ? 'animate-pulse' : ''}`}
+        />
+      )}
+      <span>{config.label}</span>
+    </span>
+  );
+}
diff --git a/src/components/competitions/CompetitionTypeBadge.tsx b/src/components/competitions/CompetitionTypeBadge.tsx
new file mode 100644
index 0000000..aa2c105
--- /dev/null
+++ b/src/components/competitions/CompetitionTypeBadge.tsx
@@ -0,0 +1,89 @@
+import React from 'react';
+import { Trophy, Target, Zap, Layers } from 'lucide-react';
+import type { CompetitionType } from '@/src/types/competition';
+
+interface CompetitionTypeBadgeProps {
+  type: CompetitionType;
+  size?: 'xs' | 'sm' | 'md';
+  showIcon?: boolean;
+  className?: string;
+}
+
+const typeConfig: Record<CompetitionType, {
+  label: string;
+  bgColor: string;
+  textColor: string;
+  Icon: React.ComponentType<{ className?: string }>;
+}> = {
+  league: {
+    label: 'League',
+    bgColor: 'bg-amber-50',
+    textColor: 'text-amber-700',
+    Icon: Trophy,
+  },
+  tournament: {
+    label: 'Tournament',
+    bgColor: 'bg-purple-50',
+    textColor: 'text-purple-700',
+    Icon: Target,
+  },
+  challenge: {
+    label: 'Challenge',
+    bgColor: 'bg-pink-50',
+    textColor: 'text-pink-700',
+    Icon: Zap,
+  },
+  hybrid: {
+    label: 'Hybrid',
+    bgColor: 'bg-indigo-50',
+    textColor: 'text-indigo-700',
+    Icon: Layers,
+  },
+};
+
+const sizeClasses = {
+  xs: {
+    padding: 'px-2 py-0.5',
+    text: 'text-xs',
+    icon: 'w-3 h-3',
+  },
+  sm: {
+    padding: 'px-2.5 py-1',
+    text: 'text-sm',
+    icon: 'w-3.5 h-3.5',
+  },
+  md: {
+    padding: 'px-3 py-1.5',
+    text: 'text-sm',
+    icon: 'w-4 h-4',
+  },
+};
+
+export default function CompetitionTypeBadge({
+  type,
+  size = 'sm',
+  showIcon = true,
+  className = '',
+}: CompetitionTypeBadgeProps) {
+  const config = typeConfig[type];
+  const sizes = sizeClasses[size];
+  const { Icon } = config;
+
+  return (
+    <span
+      className={`
+        inline-flex items-center gap-1.5
+        ${sizes.padding}
+        ${config.bgColor}
+        ${config.textColor}
+        rounded-full
+        ${sizes.text}
+        font-medium
+        ${className}
+      `}
+    >
+      {showIcon && <Icon className={sizes.icon} />}
+      <span>{config.label}</span>
+    </span>
+  );
+}
diff --git a/src/components/competitions/index.ts b/src/components/competitions/index.ts
new file mode 100644
index 0000000..023baca
--- /dev/null
+++ b/src/components/competitions/index.ts
@@ -0,0 +1,5 @@
+export { default as CompetitionStatusBadge } from './CompetitionStatusBadge';
+export { default as CompetitionTypeBadge } from './CompetitionTypeBadge';
+export { default as CompetitionCard } from './CompetitionCard';
+export { default as CompetitionCardSkeleton } from './CompetitionCardSkeleton';
+export { default as CompetitionList } from './CompetitionList';
diff --git a/src/hooks/mutations/useCompetitionMutations.ts b/src/hooks/mutations/useCompetitionMutations.ts
new file mode 100644
index 0000000..08aab8f
--- /dev/null
+++ b/src/hooks/mutations/useCompetitionMutations.ts
@@ -0,0 +1,592 @@
+import { useMutation, useQueryClient } from '@tanstack/react-query';
+import {
+  createTemplate,
+  updateTemplate,
+  createCompetition,
+  updateCompetition,
+  publishCompetition,
+  startCompetition,
+  finishCompetition,
+  cancelCompetition,
+  approveRegistration,
+  rejectRegistration,
+  createParticipant,
+  assignParticipantToGroup,
+  setParticipantSeed,
+  withdrawParticipant,
+  generateFixtures,
+  linkMatchToSlot,
+  unlinkMatchFromSlot,
+  setMatchWinner,
+  voidMatch,
+  recalculateStandings,
+  recalculateLeaderboard,
+} from '@/src/lib/api/competition-admin';
+import { competitionQueryKeys } from '@/src/hooks/queries/useCompetitionQueries';
+import type {
+  CreateTemplateRequest,
+  UpdateTemplateRequest,
+  CreateCompetitionRequest,
+  UpdateCompetitionRequest,
+  CreateParticipantRequest,
+  GenerateFixturesRequest,
+  LinkSlotRequest,
+  SetWinnerRequest,
+} from '@/src/types/competition';
+
+// ============================================================================
+// Template Mutations
+// ============================================================================
+
+/**
+ * Create a new competition template
+ */
+export function useCreateTemplate(facilityId: number) {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async (data: CreateTemplateRequest) => {
+      const result = await createTemplate(facilityId, data);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: competitionQueryKeys.templates() });
+    },
+  });
+}
+
+/**
+ * Update an existing template
+ */
+export function useUpdateTemplate() {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async ({
+      templateId,
+      data,
+    }: {
+      templateId: number;
+      data: UpdateTemplateRequest;
+    }) => {
+      const result = await updateTemplate(templateId, data);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    onSuccess: (_, variables) => {
+      queryClient.invalidateQueries({ queryKey: competitionQueryKeys.templates() });
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.templateDetail(variables.templateId),
+      });
+    },
+  });
+}
+
+// ============================================================================
+// Competition Mutations
+// ============================================================================
+
+/**
+ * Create a new competition
+ */
+export function useCreateCompetition(facilityId: number) {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async (data: CreateCompetitionRequest) => {
+      const result = await createCompetition(facilityId, data);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: competitionQueryKeys.lists() });
+    },
+  });
+}
+
+/**
+ * Update an existing competition
+ */
+export function useUpdateCompetition(competitionId: number) {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async (data: UpdateCompetitionRequest) => {
+      const result = await updateCompetition(competitionId, data);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: competitionQueryKeys.lists() });
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.detail(competitionId),
+      });
+    },
+  });
+}
+
+/**
+ * Publish a competition (draft -> published)
+ */
+export function usePublishCompetition(competitionId: number) {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async () => {
+      const result = await publishCompetition(competitionId);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: competitionQueryKeys.lists() });
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.detail(competitionId),
+      });
+    },
+  });
+}
+
+/**
+ * Start a competition (published -> running)
+ */
+export function useStartCompetition(competitionId: number) {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async () => {
+      const result = await startCompetition(competitionId);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: competitionQueryKeys.lists() });
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.detail(competitionId),
+      });
+    },
+  });
+}
+
+/**
+ * Finish a competition (running -> finished)
+ */
+export function useFinishCompetition(competitionId: number) {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async () => {
+      const result = await finishCompetition(competitionId);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: competitionQueryKeys.lists() });
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.detail(competitionId),
+      });
+    },
+  });
+}
+
+/**
+ * Cancel a competition
+ */
+export function useCancelCompetition(competitionId: number) {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async () => {
+      const result = await cancelCompetition(competitionId);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: competitionQueryKeys.lists() });
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.detail(competitionId),
+      });
+    },
+  });
+}
+
+// ============================================================================
+// Registration Mutations
+// ============================================================================
+
+/**
+ * Approve a registration
+ */
+export function useApproveRegistration(competitionId: number) {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async (registrationId: number) => {
+      const result = await approveRegistration(competitionId, registrationId);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.registrations(competitionId),
+      });
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.participants(competitionId),
+      });
+    },
+  });
+}
+
+/**
+ * Reject a registration
+ */
+export function useRejectRegistration(competitionId: number) {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async (registrationId: number) => {
+      const result = await rejectRegistration(competitionId, registrationId);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.registrations(competitionId),
+      });
+    },
+  });
+}
+
+// ============================================================================
+// Participant Mutations
+// ============================================================================
+
+/**
+ * Create a participant manually
+ */
+export function useCreateParticipant(competitionId: number) {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async (data: CreateParticipantRequest) => {
+      const result = await createParticipant(competitionId, data);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.participants(competitionId),
+      });
+    },
+  });
+}
+
+/**
+ * Assign a participant to a group
+ */
+export function useAssignParticipantToGroup(competitionId: number) {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async ({
+      participantId,
+      groupId,
+    }: {
+      participantId: number;
+      groupId: number;
+    }) => {
+      const result = await assignParticipantToGroup(participantId, groupId);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.participants(competitionId),
+      });
+    },
+  });
+}
+
+/**
+ * Set a participant's seed
+ */
+export function useSetParticipantSeed(competitionId: number) {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async ({
+      participantId,
+      seed,
+    }: {
+      participantId: number;
+      seed: number;
+    }) => {
+      const result = await setParticipantSeed(participantId, seed);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.participants(competitionId),
+      });
+    },
+  });
+}
+
+/**
+ * Withdraw a participant
+ */
+export function useWithdrawParticipant(competitionId: number) {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async (participantId: number) => {
+      const result = await withdrawParticipant(participantId);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.participants(competitionId),
+      });
+    },
+  });
+}
+
+// ============================================================================
+// Fixture Mutations
+// ============================================================================
+
+/**
+ * Generate fixtures for a stage
+ */
+export function useGenerateFixtures(competitionId: number) {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async ({
+      stageId,
+      request,
+    }: {
+      stageId: number;
+      request: GenerateFixturesRequest;
+    }) => {
+      const result = await generateFixtures(competitionId, stageId, request);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    onSuccess: (_, variables) => {
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.fixtures(competitionId, variables.stageId),
+      });
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.detail(competitionId),
+      });
+    },
+  });
+}
+
+/**
+ * Link a match to a slot
+ */
+export function useLinkMatchToSlot(competitionId: number, stageId: number) {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async ({
+      matchId,
+      request,
+    }: {
+      matchId: number;
+      request: LinkSlotRequest;
+    }) => {
+      const result = await linkMatchToSlot(matchId, request);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    onSuccess: (_, variables) => {
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.fixtures(competitionId, stageId),
+      });
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.match(variables.matchId),
+      });
+    },
+  });
+}
+
+/**
+ * Unlink a match from its slot
+ */
+export function useUnlinkMatchFromSlot(competitionId: number, stageId: number) {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async (matchId: number) => {
+      const result = await unlinkMatchFromSlot(matchId);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    onSuccess: (_, matchId) => {
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.fixtures(competitionId, stageId),
+      });
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.match(matchId),
+      });
+    },
+  });
+}
+
+/**
+ * Set a match winner manually
+ */
+export function useSetMatchWinner(competitionId: number, stageId: number) {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async ({
+      matchId,
+      request,
+    }: {
+      matchId: number;
+      request: SetWinnerRequest;
+    }) => {
+      const result = await setMatchWinner(matchId, request);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    onSuccess: (_, variables) => {
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.fixtures(competitionId, stageId),
+      });
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.match(variables.matchId),
+      });
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.standings(competitionId, stageId),
+      });
+    },
+  });
+}
+
+/**
+ * Void a match
+ */
+export function useVoidMatch(competitionId: number, stageId: number) {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async (matchId: number) => {
+      const result = await voidMatch(matchId);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    onSuccess: (_, matchId) => {
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.fixtures(competitionId, stageId),
+      });
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.match(matchId),
+      });
+    },
+  });
+}
+
+// ============================================================================
+// Standings/Leaderboard Mutations
+// ============================================================================
+
+/**
+ * Recalculate standings for a stage
+ */
+export function useRecalculateStandings(competitionId: number, stageId: number) {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async (groupId?: number) => {
+      const result = await recalculateStandings(competitionId, stageId, groupId);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.standings(competitionId, stageId),
+      });
+    },
+  });
+}
+
+/**
+ * Recalculate leaderboard for a challenge stage
+ */
+export function useRecalculateLeaderboard(competitionId: number, stageId: number) {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async () => {
+      const result = await recalculateLeaderboard(competitionId, stageId);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({
+        queryKey: competitionQueryKeys.leaderboard(competitionId, stageId),
+      });
+    },
+  });
+}
+
+// ============================================================================
+// Type exports for mutation results
+// ============================================================================
+
+export type CreateTemplateMutation = ReturnType<typeof useCreateTemplate>;
+export type UpdateTemplateMutation = ReturnType<typeof useUpdateTemplate>;
+export type CreateCompetitionMutation = ReturnType<typeof useCreateCompetition>;
+export type UpdateCompetitionMutation = ReturnType<typeof useUpdateCompetition>;
+export type PublishCompetitionMutation = ReturnType<typeof usePublishCompetition>;
+export type ApproveRegistrationMutation = ReturnType<typeof useApproveRegistration>;
+export type GenerateFixturesMutation = ReturnType<typeof useGenerateFixtures>;
diff --git a/src/hooks/queries/useCompetitionQueries.ts b/src/hooks/queries/useCompetitionQueries.ts
new file mode 100644
index 0000000..842b5ed
--- /dev/null
+++ b/src/hooks/queries/useCompetitionQueries.ts
@@ -0,0 +1,293 @@
+import { useQuery } from '@tanstack/react-query';
+import {
+  listTemplates,
+  getTemplate,
+  listCompetitions,
+  getCompetition,
+  listRegistrations,
+  listParticipants,
+  listFixtures,
+  getMatch,
+  getStandings,
+  getLeaderboard,
+} from '@/src/lib/api/competition-admin';
+import type {
+  CompetitionListFilters,
+  RegistrationListFilters,
+  ParticipantListFilters,
+  FixtureListFilters,
+  StandingsFilters,
+} from '@/src/types/competition';
+
+// ============================================================================
+// Query Keys
+// ============================================================================
+
+export const competitionQueryKeys = {
+  all: ['competitions'] as const,
+
+  // Templates
+  templates: () => [...competitionQueryKeys.all, 'templates'] as const,
+  templateList: (facilityId: number, filters?: { sport_id?: number; include_inactive?: boolean }) =>
+    [...competitionQueryKeys.templates(), 'list', facilityId, filters] as const,
+  templateDetail: (templateId: number) =>
+    [...competitionQueryKeys.templates(), 'detail', templateId] as const,
+
+  // Competitions
+  lists: () => [...competitionQueryKeys.all, 'list'] as const,
+  list: (facilityId: number, filters?: CompetitionListFilters) =>
+    [...competitionQueryKeys.lists(), facilityId, filters] as const,
+  details: () => [...competitionQueryKeys.all, 'detail'] as const,
+  detail: (competitionId: number) =>
+    [...competitionQueryKeys.details(), competitionId] as const,
+
+  // Registrations
+  registrations: (competitionId: number) =>
+    [...competitionQueryKeys.detail(competitionId), 'registrations'] as const,
+  registrationList: (competitionId: number, filters?: RegistrationListFilters) =>
+    [...competitionQueryKeys.registrations(competitionId), filters] as const,
+
+  // Participants
+  participants: (competitionId: number) =>
+    [...competitionQueryKeys.detail(competitionId), 'participants'] as const,
+  participantList: (competitionId: number, filters?: ParticipantListFilters) =>
+    [...competitionQueryKeys.participants(competitionId), filters] as const,
+
+  // Fixtures
+  fixtures: (competitionId: number, stageId: number) =>
+    [...competitionQueryKeys.detail(competitionId), 'fixtures', stageId] as const,
+  fixtureList: (competitionId: number, stageId: number, filters?: FixtureListFilters) =>
+    [...competitionQueryKeys.fixtures(competitionId, stageId), filters] as const,
+  match: (matchId: number) =>
+    [...competitionQueryKeys.all, 'match', matchId] as const,
+
+  // Standings
+  standings: (competitionId: number, stageId: number) =>
+    [...competitionQueryKeys.detail(competitionId), 'standings', stageId] as const,
+  standingsList: (competitionId: number, stageId: number, filters?: StandingsFilters) =>
+    [...competitionQueryKeys.standings(competitionId, stageId), filters] as const,
+
+  // Leaderboard
+  leaderboard: (competitionId: number, stageId: number) =>
+    [...competitionQueryKeys.detail(competitionId), 'leaderboard', stageId] as const,
+};
+
+// ============================================================================
+// Template Query Hooks
+// ============================================================================
+
+/**
+ * Fetch competition templates for a facility
+ */
+export function useCompetitionTemplates(
+  facilityId: number,
+  filters?: { sport_id?: number; include_inactive?: boolean }
+) {
+  return useQuery({
+    queryKey: competitionQueryKeys.templateList(facilityId, filters),
+    queryFn: async () => {
+      const result = await listTemplates(facilityId, filters);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    enabled: facilityId > 0,
+  });
+}
+
+/**
+ * Fetch a single template
+ */
+export function useCompetitionTemplate(templateId: number) {
+  return useQuery({
+    queryKey: competitionQueryKeys.templateDetail(templateId),
+    queryFn: async () => {
+      const result = await getTemplate(templateId);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    enabled: templateId > 0,
+  });
+}
+
+// ============================================================================
+// Competition Query Hooks
+// ============================================================================
+
+/**
+ * Fetch competitions for a facility
+ */
+export function useCompetitions(facilityId: number, filters?: CompetitionListFilters) {
+  return useQuery({
+    queryKey: competitionQueryKeys.list(facilityId, filters),
+    queryFn: async () => {
+      const result = await listCompetitions(facilityId, filters);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    enabled: facilityId > 0,
+  });
+}
+
+/**
+ * Fetch a single competition with stages
+ */
+export function useCompetition(competitionId: number) {
+  return useQuery({
+    queryKey: competitionQueryKeys.detail(competitionId),
+    queryFn: async () => {
+      const result = await getCompetition(competitionId);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    enabled: competitionId > 0,
+  });
+}
+
+// ============================================================================
+// Registration Query Hooks
+// ============================================================================
+
+/**
+ * Fetch registrations for a competition
+ */
+export function useCompetitionRegistrations(
+  competitionId: number,
+  filters?: RegistrationListFilters
+) {
+  return useQuery({
+    queryKey: competitionQueryKeys.registrationList(competitionId, filters),
+    queryFn: async () => {
+      const result = await listRegistrations(competitionId, filters);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    enabled: competitionId > 0,
+  });
+}
+
+// ============================================================================
+// Participant Query Hooks
+// ============================================================================
+
+/**
+ * Fetch participants for a competition
+ */
+export function useCompetitionParticipants(
+  competitionId: number,
+  filters?: ParticipantListFilters
+) {
+  return useQuery({
+    queryKey: competitionQueryKeys.participantList(competitionId, filters),
+    queryFn: async () => {
+      const result = await listParticipants(competitionId, filters);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    enabled: competitionId > 0,
+  });
+}
+
+// ============================================================================
+// Fixture Query Hooks
+// ============================================================================
+
+/**
+ * Fetch fixtures for a stage
+ */
+export function useCompetitionFixtures(
+  competitionId: number,
+  stageId: number,
+  filters?: FixtureListFilters
+) {
+  return useQuery({
+    queryKey: competitionQueryKeys.fixtureList(competitionId, stageId, filters),
+    queryFn: async () => {
+      const result = await listFixtures(competitionId, stageId, filters);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    enabled: competitionId > 0 && stageId > 0,
+  });
+}
+
+/**
+ * Fetch a single match
+ */
+export function useCompetitionMatch(matchId: number) {
+  return useQuery({
+    queryKey: competitionQueryKeys.match(matchId),
+    queryFn: async () => {
+      const result = await getMatch(matchId);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    enabled: matchId > 0,
+  });
+}
+
+// ============================================================================
+// Standings Query Hooks
+// ============================================================================
+
+/**
+ * Fetch standings for a stage
+ */
+export function useCompetitionStandings(
+  competitionId: number,
+  stageId: number,
+  filters?: StandingsFilters
+) {
+  return useQuery({
+    queryKey: competitionQueryKeys.standingsList(competitionId, stageId, filters),
+    queryFn: async () => {
+      const result = await getStandings(competitionId, stageId, filters);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    enabled: competitionId > 0 && stageId > 0,
+  });
+}
+
+// ============================================================================
+// Leaderboard Query Hooks
+// ============================================================================
+
+/**
+ * Fetch leaderboard for a challenge stage
+ */
+export function useCompetitionLeaderboard(
+  competitionId: number,
+  stageId: number,
+  limit: number = 100,
+  offset: number = 0
+) {
+  return useQuery({
+    queryKey: [...competitionQueryKeys.leaderboard(competitionId, stageId), limit, offset],
+    queryFn: async () => {
+      const result = await getLeaderboard(competitionId, stageId, limit, offset);
+      if (!result.success) {
+        throw new Error(result.error.detail);
+      }
+      return result.data;
+    },
+    enabled: competitionId > 0 && stageId > 0,
+  });
+}
diff --git a/src/lib/api/competition-admin.ts b/src/lib/api/competition-admin.ts
new file mode 100644
index 0000000..6bd984a
--- /dev/null
+++ b/src/lib/api/competition-admin.ts
@@ -0,0 +1,870 @@
+/**
+ * Competition Admin API Client
+ *
+ * Handles all competition management operations: templates, competitions,
+ * registrations, participants, fixtures, standings, and leaderboards.
+ */
+
+import type {
+  CompetitionTemplate,
+  CreateTemplateRequest,
+  UpdateTemplateRequest,
+  Competition,
+  CreateCompetitionRequest,
+  UpdateCompetitionRequest,
+  CompetitionListFilters,
+  CompetitionStage,
+  CompetitionRegistration,
+  CreateRegistrationRequest,
+  RegistrationListFilters,
+  CompetitionParticipant,
+  CreateParticipantRequest,
+  ParticipantListFilters,
+  CompetitionMatch,
+  GenerateFixturesRequest,
+  FixtureListFilters,
+  LinkSlotRequest,
+  SetWinnerRequest,
+  CompetitionStanding,
+  StandingsFilters,
+  LeaderboardEntry,
+  LeaderboardStats,
+  CompetitionAdminError,
+  CompetitionApiResult,
+} from '@/src/types/competition';
+import apiFetch from '@/src/utils/apiFetch';
+
+// ============================================================================
+// Helper Functions
+// ============================================================================
+
+/**
+ * Handle API response
+ * Flask backend wraps responses in: { status: 'success'|'fail', data: {...} }
+ */
+async function handleApiResponse<T>(response: Response): Promise<CompetitionApiResult<T>> {
+  if (response.ok) {
+    if (response.status === 204) {
+      return { success: true, data: undefined as T };
+    }
+
+    const json = await response.json();
+    const data = json.data !== undefined ? json.data : json;
+    return { success: true, data };
+  }
+
+  try {
+    const error: CompetitionAdminError = await response.json();
+    return { success: false, error };
+  } catch {
+    return {
+      success: false,
+      error: {
+        type: 'about:blank',
+        title: 'API Error',
+        status: response.status,
+        detail: response.statusText || 'An unexpected error occurred',
+        code: 'internal_error',
+      },
+    };
+  }
+}
+
+function buildNetworkError(message: string): CompetitionApiResult<never> {
+  return {
+    success: false,
+    error: {
+      type: 'about:blank',
+      title: 'Network Error',
+      status: 0,
+      detail: message,
+      code: 'internal_error',
+    },
+  };
+}
+
+// ============================================================================
+// Competition Templates
+// ============================================================================
+
+/**
+ * GET /competition/templates
+ * List competition templates
+ */
+export async function listTemplates(
+  facilityId: number,
+  filters?: { sport_id?: number; include_inactive?: boolean }
+): Promise<CompetitionApiResult<CompetitionTemplate[]>> {
+  try {
+    const params = new URLSearchParams();
+    params.set('facility_id', String(facilityId));
+    if (filters?.sport_id !== undefined) params.set('sport_id', String(filters.sport_id));
+    if (filters?.include_inactive) params.set('include_inactive', 'true');
+
+    const response = await apiFetch(`/competition/templates?${params}`, {
+      method: 'GET',
+      headers: { 'Content-Type': 'application/json' },
+    });
+
+    const result = await handleApiResponse<{ templates: CompetitionTemplate[] }>(response);
+    if (result.success && result.data.templates) {
+      return { success: true, data: result.data.templates };
+    }
+    return result as CompetitionApiResult<CompetitionTemplate[]>;
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to list templates');
+  }
+}
+
+/**
+ * GET /competition/templates/{template_id}
+ * Get a single template
+ */
+export async function getTemplate(
+  templateId: number
+): Promise<CompetitionApiResult<CompetitionTemplate>> {
+  try {
+    const response = await apiFetch(`/competition/templates/${templateId}`, {
+      method: 'GET',
+      headers: { 'Content-Type': 'application/json' },
+    });
+
+    const result = await handleApiResponse<{ template: CompetitionTemplate }>(response);
+    if (result.success && result.data.template) {
+      return { success: true, data: result.data.template };
+    }
+    return result as CompetitionApiResult<CompetitionTemplate>;
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to get template');
+  }
+}
+
+/**
+ * POST /competition/templates
+ * Create a new template
+ */
+export async function createTemplate(
+  facilityId: number,
+  request: CreateTemplateRequest
+): Promise<CompetitionApiResult<CompetitionTemplate>> {
+  try {
+    const response = await apiFetch('/competition/templates', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ ...request, facility_id: facilityId }),
+    });
+
+    const result = await handleApiResponse<{ template: CompetitionTemplate }>(response);
+    if (result.success && result.data.template) {
+      return { success: true, data: result.data.template };
+    }
+    return result as CompetitionApiResult<CompetitionTemplate>;
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to create template');
+  }
+}
+
+/**
+ * PATCH /competition/templates/{template_id}
+ * Update a template
+ */
+export async function updateTemplate(
+  templateId: number,
+  request: UpdateTemplateRequest
+): Promise<CompetitionApiResult<CompetitionTemplate>> {
+  try {
+    const response = await apiFetch(`/competition/templates/${templateId}`, {
+      method: 'PATCH',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify(request),
+    });
+
+    const result = await handleApiResponse<{ template: CompetitionTemplate }>(response);
+    if (result.success && result.data.template) {
+      return { success: true, data: result.data.template };
+    }
+    return result as CompetitionApiResult<CompetitionTemplate>;
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to update template');
+  }
+}
+
+// ============================================================================
+// Competitions
+// ============================================================================
+
+/**
+ * GET /competitions
+ * List competitions for a facility
+ */
+export async function listCompetitions(
+  facilityId: number,
+  filters?: CompetitionListFilters
+): Promise<CompetitionApiResult<Competition[]>> {
+  try {
+    const params = new URLSearchParams();
+    params.set('facility_id', String(facilityId));
+    if (filters?.status) params.set('status', filters.status);
+    if (filters?.sport_id !== undefined) params.set('sport_id', String(filters.sport_id));
+    if (filters?.type) params.set('type', filters.type);
+
+    const response = await apiFetch(`/competitions?${params}`, {
+      method: 'GET',
+      headers: { 'Content-Type': 'application/json' },
+    });
+
+    const result = await handleApiResponse<{ competitions: Competition[] }>(response);
+    if (result.success && result.data.competitions) {
+      return { success: true, data: result.data.competitions };
+    }
+    return result as CompetitionApiResult<Competition[]>;
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to list competitions');
+  }
+}
+
+/**
+ * GET /competition/{competition_id}
+ * Get competition with stages
+ */
+export async function getCompetition(
+  competitionId: number
+): Promise<CompetitionApiResult<Competition>> {
+  try {
+    const response = await apiFetch(`/competition/${competitionId}`, {
+      method: 'GET',
+      headers: { 'Content-Type': 'application/json' },
+    });
+
+    const result = await handleApiResponse<{ competition: Competition }>(response);
+    if (result.success && result.data.competition) {
+      return { success: true, data: result.data.competition };
+    }
+    return result as CompetitionApiResult<Competition>;
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to get competition');
+  }
+}
+
+/**
+ * POST /competition
+ * Create a new competition
+ */
+export async function createCompetition(
+  facilityId: number,
+  request: CreateCompetitionRequest
+): Promise<CompetitionApiResult<Competition>> {
+  try {
+    const response = await apiFetch('/competition', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ ...request, facility_id: facilityId }),
+    });
+
+    const result = await handleApiResponse<{ competition: Competition }>(response);
+    if (result.success && result.data.competition) {
+      return { success: true, data: result.data.competition };
+    }
+    return result as CompetitionApiResult<Competition>;
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to create competition');
+  }
+}
+
+/**
+ * PATCH /competition/{competition_id}
+ * Update a competition
+ */
+export async function updateCompetition(
+  competitionId: number,
+  request: UpdateCompetitionRequest
+): Promise<CompetitionApiResult<Competition>> {
+  try {
+    const response = await apiFetch(`/competition/${competitionId}`, {
+      method: 'PATCH',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify(request),
+    });
+
+    const result = await handleApiResponse<{ competition: Competition }>(response);
+    if (result.success && result.data.competition) {
+      return { success: true, data: result.data.competition };
+    }
+    return result as CompetitionApiResult<Competition>;
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to update competition');
+  }
+}
+
+/**
+ * POST /competition/{competition_id}/publish
+ * Publish a competition (draft -> published)
+ */
+export async function publishCompetition(
+  competitionId: number
+): Promise<CompetitionApiResult<Competition>> {
+  try {
+    const response = await apiFetch(`/competition/${competitionId}/publish`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+    });
+
+    const result = await handleApiResponse<{ competition: Competition }>(response);
+    if (result.success && result.data.competition) {
+      return { success: true, data: result.data.competition };
+    }
+    return result as CompetitionApiResult<Competition>;
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to publish competition');
+  }
+}
+
+/**
+ * POST /competition/{competition_id}/start
+ * Start a competition (published -> running)
+ */
+export async function startCompetition(
+  competitionId: number
+): Promise<CompetitionApiResult<Competition>> {
+  try {
+    const response = await apiFetch(`/competition/${competitionId}/start`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+    });
+
+    const result = await handleApiResponse<{ competition: Competition }>(response);
+    if (result.success && result.data.competition) {
+      return { success: true, data: result.data.competition };
+    }
+    return result as CompetitionApiResult<Competition>;
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to start competition');
+  }
+}
+
+/**
+ * POST /competition/{competition_id}/finish
+ * Finish a competition (running -> finished)
+ */
+export async function finishCompetition(
+  competitionId: number
+): Promise<CompetitionApiResult<Competition>> {
+  try {
+    const response = await apiFetch(`/competition/${competitionId}/finish`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+    });
+
+    const result = await handleApiResponse<{ competition: Competition }>(response);
+    if (result.success && result.data.competition) {
+      return { success: true, data: result.data.competition };
+    }
+    return result as CompetitionApiResult<Competition>;
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to finish competition');
+  }
+}
+
+/**
+ * POST /competition/{competition_id}/cancel
+ * Cancel a competition
+ */
+export async function cancelCompetition(
+  competitionId: number
+): Promise<CompetitionApiResult<Competition>> {
+  try {
+    const response = await apiFetch(`/competition/${competitionId}/cancel`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+    });
+
+    const result = await handleApiResponse<{ competition: Competition }>(response);
+    if (result.success && result.data.competition) {
+      return { success: true, data: result.data.competition };
+    }
+    return result as CompetitionApiResult<Competition>;
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to cancel competition');
+  }
+}
+
+// ============================================================================
+// Registrations
+// ============================================================================
+
+/**
+ * GET /competition/{competition_id}/registrations
+ * List registrations for a competition
+ */
+export async function listRegistrations(
+  competitionId: number,
+  filters?: RegistrationListFilters
+): Promise<CompetitionApiResult<CompetitionRegistration[]>> {
+  try {
+    const params = new URLSearchParams();
+    if (filters?.status) params.set('status', filters.status);
+
+    const queryString = params.toString();
+    const endpoint = `/competition/${competitionId}/registrations${queryString ? `?${queryString}` : ''}`;
+
+    const response = await apiFetch(endpoint, {
+      method: 'GET',
+      headers: { 'Content-Type': 'application/json' },
+    });
+
+    const result = await handleApiResponse<{ registrations: CompetitionRegistration[] }>(response);
+    if (result.success && result.data.registrations) {
+      return { success: true, data: result.data.registrations };
+    }
+    return result as CompetitionApiResult<CompetitionRegistration[]>;
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to list registrations');
+  }
+}
+
+/**
+ * POST /competition/{competition_id}/registrations/{registration_id}/approve
+ * Approve a registration
+ */
+export async function approveRegistration(
+  competitionId: number,
+  registrationId: number
+): Promise<CompetitionApiResult<{ participant_id: number }>> {
+  try {
+    const response = await apiFetch(
+      `/competition/${competitionId}/registrations/${registrationId}/approve`,
+      {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+      }
+    );
+
+    return handleApiResponse<{ participant_id: number }>(response);
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to approve registration');
+  }
+}
+
+/**
+ * POST /competition/{competition_id}/registrations/{registration_id}/reject
+ * Reject a registration
+ */
+export async function rejectRegistration(
+  competitionId: number,
+  registrationId: number
+): Promise<CompetitionApiResult<void>> {
+  try {
+    const response = await apiFetch(
+      `/competition/${competitionId}/registrations/${registrationId}/reject`,
+      {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+      }
+    );
+
+    return handleApiResponse<void>(response);
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to reject registration');
+  }
+}
+
+// ============================================================================
+// Participants
+// ============================================================================
+
+/**
+ * GET /competition/{competition_id}/participants
+ * List participants for a competition
+ */
+export async function listParticipants(
+  competitionId: number,
+  filters?: ParticipantListFilters
+): Promise<CompetitionApiResult<CompetitionParticipant[]>> {
+  try {
+    const params = new URLSearchParams();
+    if (filters?.status) params.set('status', filters.status);
+    if (filters?.stage_group_id !== undefined) params.set('stage_group_id', String(filters.stage_group_id));
+
+    const queryString = params.toString();
+    const endpoint = `/competition/${competitionId}/participants${queryString ? `?${queryString}` : ''}`;
+
+    const response = await apiFetch(endpoint, {
+      method: 'GET',
+      headers: { 'Content-Type': 'application/json' },
+    });
+
+    const result = await handleApiResponse<{ participants: CompetitionParticipant[] }>(response);
+    if (result.success && result.data.participants) {
+      return { success: true, data: result.data.participants };
+    }
+    return result as CompetitionApiResult<CompetitionParticipant[]>;
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to list participants');
+  }
+}
+
+/**
+ * POST /competition/{competition_id}/participants
+ * Create a participant manually (without registration)
+ */
+export async function createParticipant(
+  competitionId: number,
+  request: CreateParticipantRequest
+): Promise<CompetitionApiResult<CompetitionParticipant>> {
+  try {
+    const response = await apiFetch(`/competition/${competitionId}/participants`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify(request),
+    });
+
+    const result = await handleApiResponse<{ participant: CompetitionParticipant }>(response);
+    if (result.success && result.data.participant) {
+      return { success: true, data: result.data.participant };
+    }
+    return result as CompetitionApiResult<CompetitionParticipant>;
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to create participant');
+  }
+}
+
+/**
+ * POST /competition/participants/{participant_id}/assign-group
+ * Assign a participant to a group
+ */
+export async function assignParticipantToGroup(
+  participantId: number,
+  groupId: number
+): Promise<CompetitionApiResult<void>> {
+  try {
+    const response = await apiFetch(`/competition/participants/${participantId}/assign-group`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ group_id: groupId }),
+    });
+
+    return handleApiResponse<void>(response);
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to assign to group');
+  }
+}
+
+/**
+ * POST /competition/participants/{participant_id}/seed
+ * Set participant seed
+ */
+export async function setParticipantSeed(
+  participantId: number,
+  seed: number
+): Promise<CompetitionApiResult<void>> {
+  try {
+    const response = await apiFetch(`/competition/participants/${participantId}/seed`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ seed }),
+    });
+
+    return handleApiResponse<void>(response);
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to set seed');
+  }
+}
+
+/**
+ * POST /competition/participants/{participant_id}/withdraw
+ * Withdraw a participant
+ */
+export async function withdrawParticipant(
+  participantId: number
+): Promise<CompetitionApiResult<void>> {
+  try {
+    const response = await apiFetch(`/competition/participants/${participantId}/withdraw`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+    });
+
+    return handleApiResponse<void>(response);
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to withdraw participant');
+  }
+}
+
+// ============================================================================
+// Fixtures
+// ============================================================================
+
+/**
+ * POST /competition/{competition_id}/stages/{stage_id}/generate-fixtures
+ * Generate fixtures for a stage
+ */
+export async function generateFixtures(
+  competitionId: number,
+  stageId: number,
+  request: GenerateFixturesRequest
+): Promise<CompetitionApiResult<{ match_count: number; match_ids: number[] }>> {
+  try {
+    const response = await apiFetch(
+      `/competition/${competitionId}/stages/${stageId}/generate-fixtures`,
+      {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify(request),
+      }
+    );
+
+    return handleApiResponse<{ match_count: number; match_ids: number[] }>(response);
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to generate fixtures');
+  }
+}
+
+/**
+ * GET /competition/{competition_id}/stages/{stage_id}/fixtures
+ * List fixtures for a stage
+ */
+export async function listFixtures(
+  competitionId: number,
+  stageId: number,
+  filters?: FixtureListFilters
+): Promise<CompetitionApiResult<CompetitionMatch[]>> {
+  try {
+    const params = new URLSearchParams();
+    if (filters?.status) params.set('status', filters.status);
+    if (filters?.round_index !== undefined) params.set('round_index', String(filters.round_index));
+
+    const queryString = params.toString();
+    const endpoint = `/competition/${competitionId}/stages/${stageId}/fixtures${queryString ? `?${queryString}` : ''}`;
+
+    const response = await apiFetch(endpoint, {
+      method: 'GET',
+      headers: { 'Content-Type': 'application/json' },
+    });
+
+    const result = await handleApiResponse<{ fixtures: CompetitionMatch[] }>(response);
+    if (result.success && result.data.fixtures) {
+      return { success: true, data: result.data.fixtures };
+    }
+    return result as CompetitionApiResult<CompetitionMatch[]>;
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to list fixtures');
+  }
+}
+
+/**
+ * GET /competition/matches/{match_id}
+ * Get a single match
+ */
+export async function getMatch(
+  matchId: number
+): Promise<CompetitionApiResult<CompetitionMatch>> {
+  try {
+    const response = await apiFetch(`/competition/matches/${matchId}`, {
+      method: 'GET',
+      headers: { 'Content-Type': 'application/json' },
+    });
+
+    const result = await handleApiResponse<{ match: CompetitionMatch }>(response);
+    if (result.success && result.data.match) {
+      return { success: true, data: result.data.match };
+    }
+    return result as CompetitionApiResult<CompetitionMatch>;
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to get match');
+  }
+}
+
+/**
+ * POST /competition/matches/{match_id}/link-slot
+ * Link a match to a slot instance
+ */
+export async function linkMatchToSlot(
+  matchId: number,
+  request: LinkSlotRequest
+): Promise<CompetitionApiResult<void>> {
+  try {
+    const response = await apiFetch(`/competition/matches/${matchId}/link-slot`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify(request),
+    });
+
+    return handleApiResponse<void>(response);
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to link slot');
+  }
+}
+
+/**
+ * POST /competition/matches/{match_id}/unlink-slot
+ * Unlink a match from its slot instance
+ */
+export async function unlinkMatchFromSlot(
+  matchId: number
+): Promise<CompetitionApiResult<void>> {
+  try {
+    const response = await apiFetch(`/competition/matches/${matchId}/unlink-slot`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+    });
+
+    return handleApiResponse<void>(response);
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to unlink slot');
+  }
+}
+
+/**
+ * POST /competition/matches/{match_id}/set-winner
+ * Manually set match winner
+ */
+export async function setMatchWinner(
+  matchId: number,
+  request: SetWinnerRequest
+): Promise<CompetitionApiResult<void>> {
+  try {
+    const response = await apiFetch(`/competition/matches/${matchId}/set-winner`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify(request),
+    });
+
+    return handleApiResponse<void>(response);
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to set winner');
+  }
+}
+
+/**
+ * POST /competition/matches/{match_id}/void
+ * Void a match
+ */
+export async function voidMatch(
+  matchId: number
+): Promise<CompetitionApiResult<void>> {
+  try {
+    const response = await apiFetch(`/competition/matches/${matchId}/void`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+    });
+
+    return handleApiResponse<void>(response);
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to void match');
+  }
+}
+
+// ============================================================================
+// Standings
+// ============================================================================
+
+/**
+ * GET /competition/{competition_id}/stages/{stage_id}/standings
+ * Get standings for a stage
+ */
+export async function getStandings(
+  competitionId: number,
+  stageId: number,
+  filters?: StandingsFilters
+): Promise<CompetitionApiResult<CompetitionStanding[]>> {
+  try {
+    const params = new URLSearchParams();
+    if (filters?.group_id !== undefined) params.set('group_id', String(filters.group_id));
+
+    const queryString = params.toString();
+    const endpoint = `/competition/${competitionId}/stages/${stageId}/standings${queryString ? `?${queryString}` : ''}`;
+
+    const response = await apiFetch(endpoint, {
+      method: 'GET',
+      headers: { 'Content-Type': 'application/json' },
+    });
+
+    const result = await handleApiResponse<{ standings: CompetitionStanding[] }>(response);
+    if (result.success && result.data.standings) {
+      return { success: true, data: result.data.standings };
+    }
+    return result as CompetitionApiResult<CompetitionStanding[]>;
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to get standings');
+  }
+}
+
+/**
+ * POST /competition/{competition_id}/stages/{stage_id}/standings/recalculate
+ * Recalculate standings
+ */
+export async function recalculateStandings(
+  competitionId: number,
+  stageId: number,
+  groupId?: number
+): Promise<CompetitionApiResult<{ participant_count: number }>> {
+  try {
+    const response = await apiFetch(
+      `/competition/${competitionId}/stages/${stageId}/standings/recalculate`,
+      {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify(groupId !== undefined ? { group_id: groupId } : {}),
+      }
+    );
+
+    return handleApiResponse<{ participant_count: number }>(response);
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to recalculate standings');
+  }
+}
+
+// ============================================================================
+// Leaderboard
+// ============================================================================
+
+/**
+ * GET /competition/{competition_id}/stages/{stage_id}/leaderboard
+ * Get leaderboard for a challenge stage
+ */
+export async function getLeaderboard(
+  competitionId: number,
+  stageId: number,
+  limit: number = 100,
+  offset: number = 0
+): Promise<CompetitionApiResult<{ leaderboard: LeaderboardEntry[]; stats: LeaderboardStats }>> {
+  try {
+    const params = new URLSearchParams();
+    if (limit !== 100) params.set('limit', String(limit));
+    if (offset !== 0) params.set('offset', String(offset));
+
+    const queryString = params.toString();
+    const endpoint = `/competition/${competitionId}/stages/${stageId}/leaderboard${queryString ? `?${queryString}` : ''}`;
+
+    const response = await apiFetch(endpoint, {
+      method: 'GET',
+      headers: { 'Content-Type': 'application/json' },
+    });
+
+    return handleApiResponse<{ leaderboard: LeaderboardEntry[]; stats: LeaderboardStats }>(response);
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to get leaderboard');
+  }
+}
+
+/**
+ * POST /competition/{competition_id}/stages/{stage_id}/leaderboard/recalculate
+ * Recalculate leaderboard
+ */
+export async function recalculateLeaderboard(
+  competitionId: number,
+  stageId: number
+): Promise<CompetitionApiResult<{ entry_count: number }>> {
+  try {
+    const response = await apiFetch(
+      `/competition/${competitionId}/stages/${stageId}/leaderboard/recalculate`,
+      {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+      }
+    );
+
+    return handleApiResponse<{ entry_count: number }>(response);
+  } catch (error) {
+    return buildNetworkError(error instanceof Error ? error.message : 'Failed to recalculate leaderboard');
+  }
+}
diff --git a/src/types/competition.ts b/src/types/competition.ts
new file mode 100644
index 0000000..10876ec
--- /dev/null
+++ b/src/types/competition.ts
@@ -0,0 +1,508 @@
+/**
+ * Competition Admin TypeScript Types
+ *
+ * Types for competition management: templates, competitions, registrations,
+ * participants, fixtures, standings, and leaderboards.
+ */
+
+// ============================================================================
+// Competition Types (Enums)
+// ============================================================================
+
+export type CompetitionType = 'league' | 'tournament' | 'challenge' | 'hybrid';
+export type CompetitionScope = 'facility' | 'cross_facility' | 'platform';
+export type CompetitionStatus = 'draft' | 'published' | 'running' | 'finished' | 'cancelled';
+export type CompetitionVisibility = 'public' | 'unlisted' | 'private';
+export type StageType = 'round_robin' | 'group_stage' | 'knockout_single' | 'knockout_double' | 'rating_delta_challenge';
+export type StageStatus = 'pending' | 'active' | 'completed';
+export type RegistrationStatus = 'pending' | 'approved' | 'rejected' | 'waitlisted' | 'withdrawn';
+export type ParticipantType = 'single' | 'pair' | 'team';
+export type ParticipantStatus = 'active' | 'withdrawn' | 'eliminated';
+export type MatchStatus = 'draft' | 'needs_scheduling' | 'scheduled' | 'in_progress' | 'completed' | 'voided';
+
+// ============================================================================
+// Competition Templates
+// ============================================================================
+
+export interface CompetitionTemplate {
+  template_id: number;
+  type: CompetitionType;
+  scope: 'platform' | 'facility';
+  facility_id: number | null;
+  sport_id: number;
+  name: string;
+  description: string | null;
+  config: CompetitionConfig;
+  config_version: number;
+  source_template_id: number | null;
+  is_active: boolean;
+  created_at: string;
+  updated_at: string | null;
+  created_by_app_user_id: number;
+}
+
+export interface CreateTemplateRequest {
+  type: CompetitionType;
+  scope: 'platform' | 'facility';
+  sport_id: number;
+  name: string;
+  description?: string | null;
+  config: CompetitionConfig;
+}
+
+export interface UpdateTemplateRequest {
+  name?: string;
+  description?: string | null;
+  config?: CompetitionConfig;
+  is_active?: boolean;
+}
+
+// ============================================================================
+// Competitions
+// ============================================================================
+
+export interface Competition {
+  competition_id: number;
+  type: CompetitionType;
+  scope: CompetitionScope;
+  facility_id: number | null;
+  owner_app_user_id: number;
+  template_id: number | null;
+  series_id: number | null;
+  sport_id: number;
+  title: string;
+  description: string | null;
+  visibility: CompetitionVisibility;
+  status: CompetitionStatus;
+  registration_open_at: string | null;
+  registration_close_at: string | null;
+  starts_at: string;
+  ends_at: string | null;
+  config_snapshot: CompetitionConfig;
+  config_version: number;
+  created_at: string;
+  updated_at: string | null;
+  created_by_app_user_id: number;
+  // Joined data
+  stages?: CompetitionStage[];
+  participant_count?: number;
+  registration_count?: number;
+}
+
+export interface CreateCompetitionRequest {
+  type: CompetitionType;
+  scope?: CompetitionScope;
+  template_id?: number | null;
+  sport_id: number;
+  title: string;
+  description?: string | null;
+  visibility?: CompetitionVisibility;
+  registration_open_at?: string | null;
+  registration_close_at?: string | null;
+  starts_at: string;
+  ends_at?: string | null;
+  config?: CompetitionConfig;
+}
+
+export interface UpdateCompetitionRequest {
+  title?: string;
+  description?: string | null;
+  visibility?: CompetitionVisibility;
+  registration_open_at?: string | null;
+  registration_close_at?: string | null;
+  starts_at?: string;
+  ends_at?: string | null;
+}
+
+export interface CompetitionListFilters {
+  status?: CompetitionStatus;
+  sport_id?: number;
+  type?: CompetitionType;
+}
+
+// ============================================================================
+// Competition Stages
+// ============================================================================
+
+export interface CompetitionStage {
+  stage_id: number;
+  competition_id: number;
+  stage_type: StageType;
+  name: string;
+  stage_order: number;
+  status: StageStatus;
+  config: StageConfig;
+  created_at: string;
+  // Joined data
+  groups?: CompetitionGroup[];
+  match_count?: number;
+}
+
+export interface StageConfig {
+  // Round robin / group stage
+  legs?: number;
+  points_win?: number;
+  points_draw?: number;
+  points_loss?: number;
+  // Knockout
+  third_place_match?: boolean;
+  // Challenge
+  leaderboard_metric?: 'rating_delta_sum' | 'rating_delta_avg' | 'rating_delta_max';
+  min_matches?: number;
+}
+
+// ============================================================================
+// Competition Groups
+// ============================================================================
+
+export interface CompetitionGroup {
+  group_id: number;
+  stage_id: number;
+  name: string;
+  display_order: number;
+  // Joined data
+  participant_count?: number;
+}
+
+// ============================================================================
+// Registrations
+// ============================================================================
+
+export interface CompetitionRegistration {
+  registration_id: number;
+  competition_id: number;
+  app_user_id: number;
+  display_name: string;
+  email?: string;
+  status: RegistrationStatus;
+  team_name: string | null;
+  notes: string | null;
+  created_at: string;
+  updated_at: string | null;
+  reviewed_at: string | null;
+  reviewed_by_app_user_id: number | null;
+  // Joined data
+  members: RegistrationMember[];
+}
+
+export interface RegistrationMember {
+  origin_member_id: number;
+  display_name: string;
+  role: 'captain' | 'player';
+}
+
+export interface CreateRegistrationRequest {
+  origin_member_ids: number[];
+  team_name?: string | null;
+  notes?: string | null;
+}
+
+export interface RegistrationListFilters {
+  status?: RegistrationStatus;
+}
+
+// ============================================================================
+// Participants
+// ============================================================================
+
+export interface CompetitionParticipant {
+  participant_id: number;
+  competition_id: number;
+  registration_id: number | null;
+  participant_type: ParticipantType;
+  display_name: string;
+  seed: number | null;
+  status: ParticipantStatus;
+  stage_group_id: number | null;
+  created_at: string;
+  // Joined data
+  members: ParticipantMember[];
+  group_name?: string | null;
+}
+
+export interface ParticipantMember {
+  origin_member_id: number;
+  display_name: string;
+  role: 'captain' | 'player';
+}
+
+export interface CreateParticipantRequest {
+  origin_member_ids: number[];
+  participant_type?: ParticipantType;
+  display_name?: string | null;
+  seed?: number | null;
+  stage_group_id?: number | null;
+}
+
+export interface ParticipantListFilters {
+  status?: ParticipantStatus;
+  stage_group_id?: number;
+}
+
+// ============================================================================
+// Fixtures / Matches
+// ============================================================================
+
+export interface CompetitionMatch {
+  competition_match_id: number;
+  competition_id: number;
+  stage_id: number;
+  group_id: number | null;
+  round_index: number;
+  match_index: number;
+  home_participant_id: number | null;
+  away_participant_id: number | null;
+  home_from_match_id: number | null;
+  home_from_outcome: 'winner' | 'loser' | null;
+  away_from_match_id: number | null;
+  away_from_outcome: 'winner' | 'loser' | null;
+  slot_instance_id: number | null;
+  status: MatchStatus;
+  winner_participant_id: number | null;
+  scheduled_at: string | null;
+  created_at: string;
+  updated_at: string | null;
+  // Joined data
+  home_participant?: CompetitionParticipant | null;
+  away_participant?: CompetitionParticipant | null;
+  stage_name?: string;
+  group_name?: string | null;
+}
+
+export interface GenerateFixturesRequest {
+  stage_type: StageType;
+  legs?: number;
+  group_id?: number | null;
+  third_place_match?: boolean;
+}
+
+export interface FixtureListFilters {
+  status?: MatchStatus;
+  round_index?: number;
+}
+
+export interface LinkSlotRequest {
+  slot_instance_id: number;
+}
+
+export interface SetWinnerRequest {
+  winner_participant_id: number;
+}
+
+// ============================================================================
+// Standings
+// ============================================================================
+
+export interface CompetitionStanding {
+  standing_id: number;
+  stage_id: number;
+  group_id: number | null;
+  participant_id: number;
+  rank: number;
+  played: number;
+  won: number;
+  drawn: number;
+  lost: number;
+  goals_for: number;
+  goals_against: number;
+  goal_difference: number;
+  points: number;
+  updated_at: string;
+  // Joined data
+  display_name: string;
+  participant?: CompetitionParticipant;
+}
+
+export interface StandingsFilters {
+  group_id?: number;
+}
+
+// ============================================================================
+// Leaderboard
+// ============================================================================
+
+export interface LeaderboardEntry {
+  entry_id: number;
+  stage_id: number;
+  participant_id: number;
+  origin_member_id: number;
+  rank: number;
+  metric_value: number;
+  matches_counted: number;
+  updated_at: string;
+  // Joined data
+  display_name: string;
+  participant?: CompetitionParticipant;
+}
+
+export interface LeaderboardStats {
+  total_entries: number;
+  total_matches: number;
+  top_metric_value: number;
+}
+
+// ============================================================================
+// Competition Config
+// ============================================================================
+
+export interface CompetitionConfig {
+  format?: FormatConfig;
+  ops?: OpsConfig;
+  rating?: RatingConfig;
+  experience?: ExperienceConfig;
+}
+
+export interface FormatConfig {
+  stages: StageConfig[];
+  participant_type?: ParticipantType;
+  team_size?: { min: number; max: number };
+}
+
+export interface OpsConfig {
+  registration?: {
+    requires_approval?: boolean;
+    max_participants?: number;
+    waitlist_enabled?: boolean;
+  };
+  scheduling?: {
+    auto_schedule?: boolean;
+    preferred_days?: number[];
+    preferred_hours?: { start: number; end: number };
+  };
+  verification?: {
+    require_score_consensus?: boolean;
+    allow_admin_override?: boolean;
+  };
+}
+
+export interface RatingConfig {
+  affects_rating?: boolean;
+  rating_weight?: number;
+}
+
+export interface ExperienceConfig {
+  theme?: string;
+  share_cards?: boolean;
+  badges_enabled?: boolean;
+}
+
+// ============================================================================
+// Error Types (RFC-7807)
+// ============================================================================
+
+export interface CompetitionAdminError {
+  type: string;
+  title: string;
+  status: number;
+  detail: string;
+  code: CompetitionErrorCode;
+  errors?: ValidationError[];
+  meta?: Record<string, unknown>;
+}
+
+export interface ValidationError {
+  field: string;
+  message: string;
+}
+
+export type CompetitionErrorCode =
+  | 'validation_error'
+  | 'not_found'
+  | 'unauthorized'
+  | 'forbidden'
+  | 'internal_error'
+  | 'competition_not_found'
+  | 'template_not_found'
+  | 'registration_not_found'
+  | 'participant_not_found'
+  | 'match_not_found'
+  | 'stage_not_found'
+  | 'invalid_status_transition'
+  | 'registration_closed'
+  | 'already_registered'
+  | 'fixtures_already_generated'
+  | 'match_already_scheduled'
+  | 'match_already_completed';
+
+// ============================================================================
+// API Result Wrapper
+// ============================================================================
+
+export type CompetitionApiResult<T> =
+  | { success: true; data: T }
+  | { success: false; error: CompetitionAdminError };
+
+// ============================================================================
+// User-Friendly Error Messages
+// ============================================================================
+
+export const COMPETITION_ERROR_MESSAGES: Record<CompetitionErrorCode, { title: string; hint: string }> = {
+  validation_error: {
+    title: 'Please fix the highlighted fields.',
+    hint: 'Check your input and try again.',
+  },
+  not_found: {
+    title: 'Not found.',
+    hint: 'The resource you requested does not exist.',
+  },
+  unauthorized: {
+    title: 'Not authenticated.',
+    hint: 'Please log in and try again.',
+  },
+  forbidden: {
+    title: 'Access denied.',
+    hint: "You don't have permission to perform this action.",
+  },
+  internal_error: {
+    title: 'Something went wrong.',
+    hint: 'Please try again later.',
+  },
+  competition_not_found: {
+    title: 'Competition not found.',
+    hint: 'This competition may have been deleted.',
+  },
+  template_not_found: {
+    title: 'Template not found.',
+    hint: 'This template may have been deleted.',
+  },
+  registration_not_found: {
+    title: 'Registration not found.',
+    hint: 'This registration may have been deleted.',
+  },
+  participant_not_found: {
+    title: 'Participant not found.',
+    hint: 'This participant may have been withdrawn.',
+  },
+  match_not_found: {
+    title: 'Match not found.',
+    hint: 'This match may have been deleted.',
+  },
+  stage_not_found: {
+    title: 'Stage not found.',
+    hint: 'This stage may have been deleted.',
+  },
+  invalid_status_transition: {
+    title: 'Invalid status change.',
+    hint: 'This status transition is not allowed.',
+  },
+  registration_closed: {
+    title: 'Registration is closed.',
+    hint: 'The registration period for this competition has ended.',
+  },
+  already_registered: {
+    title: 'Already registered.',
+    hint: 'You are already registered for this competition.',
+  },
+  fixtures_already_generated: {
+    title: 'Fixtures already exist.',
+    hint: 'Fixtures have already been generated for this stage.',
+  },
+  match_already_scheduled: {
+    title: 'Match already scheduled.',
+    hint: 'This match has already been linked to a slot.',
+  },
+  match_already_completed: {
+    title: 'Match already completed.',
+    hint: 'This match has already been completed.',
+  },
+};