diff --git a/app/playoff.py b/app/playoff.py
index 0d5e8c7..8d4153a 100644
--- a/app/playoff.py
+++ b/app/playoff.py
@@ -92,10 +92,19 @@ def series_state(series_status):
     }
 
 
+def _game_number(game, state):
+    """This card's game number. Prefer the raw ``gameNumber`` field so we don't
+    drift forward once ``seriesStatus`` advances after the game ends."""
+    raw = game.get("gameNumber")
+    if isinstance(raw, int) and raw > 0:
+        return raw
+    return state["game_number"]
+
+
 def series_blurb(game):
     """One sentence of series context for a playoff card."""
     state = series_state(game.get("seriesStatus", {}))
-    g = state["game_number"]
+    g = _game_number(game, state)
     leader_name = _leader_name(game, state)
     trailer_name = _trailer_name(game, state)
 
@@ -137,7 +146,7 @@ def series_badges(game):
 def series_summary(game):
     """Short line rendered above the card, e.g. 'Game 2 of 7'."""
     state = series_state(game.get("seriesStatus", {}))
-    return f"Game {state['game_number']} of 7"
+    return f"Game {_game_number(game, state)} of 7"
 
 
 def is_pinned(game):
diff --git a/tests/conftest.py b/tests/conftest.py
index def4022..7016ad4 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -65,6 +65,7 @@ def make_playoff_game(
     bottom_abbrev="BOS",
     top_is_home=True,
     game_state="LIVE",
+    game_number=None,
     **kwargs,
 ):
     """Convenience wrapper around make_game for playoff fixtures.
@@ -87,7 +88,7 @@ def make_playoff_game(
         home_abbrev, away_abbrev = bottom_abbrev, top_abbrev
         home_name, away_name = "Bottom Seeds", "Top Seeds"
 
-    return make_game(
+    game = make_game(
         game_state=game_state,
         game_type=3,
         series_status=series_status,
@@ -97,6 +98,9 @@ def make_playoff_game(
         away_name=kwargs.pop("away_name", away_name),
         **kwargs,
     )
+    if game_number is not None:
+        game["gameNumber"] = game_number
+    return game
 
 
 LIVE_GAME = make_game()
diff --git a/tests/test_playoff_series.py b/tests/test_playoff_series.py
index ca9e5f8..51556c2 100644
--- a/tests/test_playoff_series.py
+++ b/tests/test_playoff_series.py
@@ -149,6 +149,12 @@ class TestSeriesSummary:
         game = make_playoff_game(top_wins=1, bottom_wins=1)
         assert series_summary(game) == "Game 3 of 7"
 
+    def test_finished_game_keeps_its_own_number(self):
+        # seriesStatus has advanced to 2-0 after this game finished, but the
+        # raw gameNumber pins the card to the game it actually represents.
+        game = make_playoff_game(top_wins=2, bottom_wins=0, game_number=2)
+        assert series_summary(game) == "Game 2 of 7"
+
 
 class TestIsPinned:
     def test_game7_live_is_pinned(self):