diff --git a/command_logic/logic_gameplay.py b/command_logic/logic_gameplay.py
index 7c45c18..7814455 100644
--- a/command_logic/logic_gameplay.py
+++ b/command_logic/logic_gameplay.py
@@ -4293,8 +4293,8 @@ async def _trigger_variant_renders(tier_ups: list) -> dict:
         if variant is None:
             continue
         player_id = tier_up["player_id"]
-        track = tier_up.get("track_name", "Batter")
-        card_type = "pitching" if track.lower() == "pitcher" else "batting"
+        ct = tier_up.get("card_type", "batter")
+        card_type = "pitching" if ct in ("sp", "rp") else "batting"
         try:
             result = await db_get(
                 f"players/{player_id}/{card_type}card/{today}/{variant}",
diff --git a/tests/test_post_game_render.py b/tests/test_post_game_render.py
index 2470dfe..2054525 100644
--- a/tests/test_post_game_render.py
+++ b/tests/test_post_game_render.py
@@ -12,10 +12,15 @@ class TestTriggerVariantRenders:
 
     @pytest.mark.asyncio
     async def test_calls_render_url_for_each_tier_up(self):
-        """Each tier-up with variant_created triggers a card render GET request."""
+        """Each tier-up with variant_created triggers a card render GET request.
+
+        card_type field ('sp', 'rp', 'batter') determines the render URL segment
+        ('pitchingcard' or 'battingcard'). This prevents silent wrong-type renders
+        when track_name strings vary ('Pitcher', 'Starting Pitcher', 'SP', etc.).
+        """
         tier_ups = [
-            {"player_id": 100, "variant_created": 7, "track_name": "Batter"},
-            {"player_id": 200, "variant_created": 3, "track_name": "Pitcher"},
+            {"player_id": 100, "variant_created": 7, "card_type": "batter"},
+            {"player_id": 200, "variant_created": 3, "card_type": "sp"},
         ]
 
         with patch(
@@ -26,14 +31,20 @@ class TestTriggerVariantRenders:
 
             assert mock_get.call_count == 2
             call_args_list = [call.args[0] for call in mock_get.call_args_list]
-            assert any("100" in url and "7" in url for url in call_args_list)
-            assert any("200" in url and "3" in url for url in call_args_list)
+            assert any(
+                "100" in url and "battingcard" in url and "7" in url
+                for url in call_args_list
+            )
+            assert any(
+                "200" in url and "pitchingcard" in url and "3" in url
+                for url in call_args_list
+            )
 
     @pytest.mark.asyncio
     async def test_skips_tier_ups_without_variant(self):
         """Tier-ups without variant_created are skipped."""
         tier_ups = [
-            {"player_id": 100, "track_name": "Batter"},
+            {"player_id": 100, "card_type": "batter"},
         ]
 
         with patch(
@@ -46,7 +57,7 @@ class TestTriggerVariantRenders:
     async def test_api_failure_does_not_raise(self):
         """Render trigger failures are swallowed — fire-and-forget."""
         tier_ups = [
-            {"player_id": 100, "variant_created": 7, "track_name": "Batter"},
+            {"player_id": 100, "variant_created": 7, "card_type": "batter"},
         ]
 
         with patch(