diff --git a/tournaments/models/round.py b/tournaments/models/round.py
index 54d1c62..352435b 100644
--- a/tournaments/models/round.py
+++ b/tournaments/models/round.py
@@ -107,16 +107,16 @@ class Round(SideStoreModel):
         return True
 
     def prepare_match_group(self, next_round, parent_round, loser_final, double_butterfly_mode):
-        matches = self.match_set.filter(disabled=False).order_by('index')
+        matches = self.matches.filter(disabled=False).order_by('index')
         if len(matches) == 0:
             return None
         if next_round:
-            next_round_matches = next_round.match_set.filter(disabled=False).order_by('index')
+            next_round_matches = next_round.matches.filter(disabled=False).order_by('index')
         else:
             next_round_matches = []
 
         if len(matches) < len(next_round_matches):
-            all_matches = self.match_set.order_by('index')
+            all_matches = self.matches.order_by('index')
             filtered_matches = []
 
             # Process matches in pairs
@@ -152,7 +152,7 @@ class Round(SideStoreModel):
             else:
                 first_half_matches = list(matches)  # Convert QuerySet to a list
                 if self.index == 0 and loser_final:
-                    loser_match = loser_final.match_set.first()
+                    loser_match = loser_final.matches.first()
                     if loser_match:
                         first_half_matches.append(loser_match)