diff --git a/backend/services/tournamentService.js b/backend/services/tournamentService.js
index 9a90a10..82e7694 100644
--- a/backend/services/tournamentService.js
+++ b/backend/services/tournamentService.js
@@ -743,7 +743,9 @@ class TournamentService {
                 name: tournamentName,
                 date,
                 clubId: +clubId,
-                type: '',
+                type: 'groups',
+                numberOfGroups: 1,
+                advancingPerGroup: 1,
                 winningSets: sets,
                 allowsExternal: false,
                 miniChampionshipYear: Y
diff --git a/frontend/src/views/TournamentTab.vue b/frontend/src/views/TournamentTab.vue
index 99c5fbc..46675b7 100644
--- a/frontend/src/views/TournamentTab.vue
+++ b/frontend/src/views/TournamentTab.vue
@@ -1208,7 +1208,10 @@ export default {
             const tournament = tRes.data;
             this.currentTournamentName = tournament.name || '';
             this.currentTournamentDate = tournament.date || '';
-            this.currentWinningSets = tournament.winningSets || 3;
+            const defaultSets = tournament.miniChampionshipYear != null ? 1 : 3;
+            this.currentWinningSets = (tournament.winningSets != null && tournament.winningSets >= 1)
+                ? tournament.winningSets
+                : defaultSets;
             this.isGroupTournament = tournament.type === 'groups';
             // Defensive: Backend/DB kann (historisch/UI-default) 0/null liefern.
             // Für gruppenbasierte Turniere ohne Klassen brauchen wir hier aber eine sinnvolle Zahl,