diff --git a/backend/services/tournamentService.js b/backend/services/tournamentService.js
index fdfd2fe..9a90a10 100644
--- a/backend/services/tournamentService.js
+++ b/backend/services/tournamentService.js
@@ -718,8 +718,9 @@ class TournamentService {
      * Minimeisterschaft anlegen: Turnier + 6 vorkonfigurierte Klassen (Jungen/Mädchen 12, 10, 8).
      * Name wird generiert: "Minimeisterschaften <Jahr> Ortsentscheid <ort>".
      * Jahr Y: 12 = in Y 11 oder 12 Jahre (Geburtsjahr Y-12 oder Y-11), 10 = 9/10 (Y-10, Y-9), 8 = 8 oder jünger (≥ Y-8).
+     * Standard-Gewinnsätze: 1.
      */
-    async addMiniChampionship(userToken, clubId, ort, date, year, winningSets = 3) {
+    async addMiniChampionship(userToken, clubId, ort, date, year, winningSets = 1) {
         await checkAccess(userToken, clubId);
         const ortTrimmed = (ort || '').trim();
         if (!ortTrimmed) {
@@ -734,38 +735,47 @@ class TournamentService {
             throw new Error('Ungültiges Jahr für die Minimeisterschaft');
         }
         const tournamentName = `Minimeisterschaften ${Y} Ortsentscheid ${ortTrimmed}`;
-        const t = await Tournament.create({
-            name: tournamentName,
-            date,
-            clubId: +clubId,
-            bestOfEndroundSize: 0,
-            type: '',
-            winningSets: winningSets || 3,
-            allowsExternal: false,
-            miniChampionshipYear: Y
-        });
-        const classes = [
-            { name: 'Jungen 12', gender: 'male', minBirthYear: Y - 12, maxBirthYear: Y - 11 },
-            { name: 'Jungen 10', gender: 'male', minBirthYear: Y - 10, maxBirthYear: Y - 9 },
-            { name: 'Jungen 8', gender: 'male', minBirthYear: Y - 8, maxBirthYear: null },
-            { name: 'Mädchen 12', gender: 'female', minBirthYear: Y - 12, maxBirthYear: Y - 11 },
-            { name: 'Mädchen 10', gender: 'female', minBirthYear: Y - 10, maxBirthYear: Y - 9 },
-            { name: 'Mädchen 8', gender: 'female', minBirthYear: Y - 8, maxBirthYear: null },
-        ];
-        for (let i = 0; i < classes.length; i++) {
-            await TournamentClass.create({
-                tournamentId: t.id,
-                name: classes[i].name,
-                sortOrder: i + 1,
-                isDoubles: false,
-                gender: classes[i].gender,
-                minBirthYear: classes[i].minBirthYear,
-                maxBirthYear: classes[i].maxBirthYear
-            });
+        const sets = (winningSets != null && winningSets >= 1) ? Number(winningSets) : 1;
+
+        const transaction = await Tournament.sequelize.transaction();
+        try {
+            const t = await Tournament.create({
+                name: tournamentName,
+                date,
+                clubId: +clubId,
+                type: '',
+                winningSets: sets,
+                allowsExternal: false,
+                miniChampionshipYear: Y
+            }, { transaction });
+
+            const classes = [
+                { name: 'Jungen 12', gender: 'male', minBirthYear: Y - 12, maxBirthYear: Y - 11 },
+                { name: 'Jungen 10', gender: 'male', minBirthYear: Y - 10, maxBirthYear: Y - 9 },
+                { name: 'Jungen 8', gender: 'male', minBirthYear: Y - 8, maxBirthYear: null },
+                { name: 'Mädchen 12', gender: 'female', minBirthYear: Y - 12, maxBirthYear: Y - 11 },
+                { name: 'Mädchen 10', gender: 'female', minBirthYear: Y - 10, maxBirthYear: Y - 9 },
+                { name: 'Mädchen 8', gender: 'female', minBirthYear: Y - 8, maxBirthYear: null },
+            ];
+            for (let i = 0; i < classes.length; i++) {
+                await TournamentClass.create({
+                    tournamentId: t.id,
+                    name: classes[i].name,
+                    sortOrder: i + 1,
+                    isDoubles: false,
+                    gender: classes[i].gender,
+                    minBirthYear: classes[i].minBirthYear,
+                    maxBirthYear: classes[i].maxBirthYear
+                }, { transaction });
+            }
+            await transaction.commit();
+            return JSON.parse(JSON.stringify(await Tournament.findByPk(t.id, {
+                attributes: ['id', 'name', 'date', 'allowsExternal', 'miniChampionshipYear']
+            })));
+        } catch (err) {
+            await transaction.rollback();
+            throw err;
         }
-        return JSON.parse(JSON.stringify(await Tournament.findByPk(t.id, {
-            attributes: ['id', 'name', 'date', 'allowsExternal', 'miniChampionshipYear']
-        })));
     }
 
     // 3. Teilnehmer hinzufügen (kein Duplikat) - klassengebunden
diff --git a/frontend/src/components/tournament/TournamentConfigTab.vue b/frontend/src/components/tournament/TournamentConfigTab.vue
index c37ec63..02d2e1d 100644
--- a/frontend/src/components/tournament/TournamentConfigTab.vue
+++ b/frontend/src/components/tournament/TournamentConfigTab.vue
@@ -48,7 +48,7 @@
             @update:newClassMinBirthYear="$emit('update:newClassMinBirthYear', $event)"
         />
 
-        <div class="stage-config" style="margin-top: 1.5rem;">
+        <div v-if="!isMiniChampionship" class="stage-config" style="margin-top: 1.5rem;">
             <h3>Zwischenrunde & Endrunde</h3>
             <div v-if="stageConfig.loading" style="opacity: 0.8;">
                 Lade Zwischenrunden …
@@ -224,6 +224,10 @@ export default {
             type: Boolean,
             required: true
         },
+        isMiniChampionship: {
+            type: Boolean,
+            default: false
+        },
         tournamentClasses: {
             type: Array,
             required: true
diff --git a/frontend/src/views/TournamentTab.vue b/frontend/src/views/TournamentTab.vue
index 7ecbb08..99c5fbc 100644
--- a/frontend/src/views/TournamentTab.vue
+++ b/frontend/src/views/TournamentTab.vue
@@ -95,6 +95,7 @@
                 :club-id="currentClub"
                 :tournament-id="selectedDate"
                 :tournament-name="currentTournamentName"
+                :is-mini-championship="isMiniChampionship"
                 :tournament-date="currentTournamentDate"
                 :winning-sets="currentWinningSets"
                 :is-group-tournament="isGroupTournament"