diff --git a/sync_dota2_matches.py b/sync_dota2_matches.py
index 40f6923..8db49a3 100644
--- a/sync_dota2_matches.py
+++ b/sync_dota2_matches.py
@@ -317,7 +317,16 @@ class Dota2CalendarSync:
                     score2 = int(score_parts.group(2))
                     
                     # Check if series is completed
-                    completed = self._is_series_completed(score1, score2, format_str)
+                    # Only mark as completed if the match has already started
+                    now = datetime.now(pytz.UTC)
+                    match_has_started = match_datetime <= now
+                    
+                    if match_has_started:
+                        completed = self._is_series_completed(score1, score2, format_str)
+                    else:
+                        # Future match with score - likely a placeholder/prediction
+                        completed = False
+                        logger.debug(f"Future match {team1} vs {team2} has score {score} but not marking as completed")
                     
                     if completed:
                         winner = team1 if score1 > score2 else team2