The Cardinals and United tied in a Badgerland Conference game, though Fond du Lac won in a shootout to earn points in league play.
Ryan Sabel recorded a hat trick for the Cardinals, which opened up a 3-1 lead after the first period before needing a late rally to send the game to overtime.
Sabel scored his third goal at 16:39 in the third period to tie the game at 4-4.
Henry Lange also had a goal and two assists for Fond du Lac. Zach Wilson chipped in two assists, while Cole Carlson and Sabel each had one.
TJ Draves made 20 saves in goal.
| Appleton | 1 | 1 | 2 | 0 | — 4 |
| Fond du Lac | 3 | 0 | 1 | 0 | — 4 |
First period: FDL— Ryan Sabel (Cole Carlson, Henry Lange), 10:44. FDL— Sabel (Zach Wilson, Lange), 15:27. FDL— Lange (Sabel, Wilson), 15:42. APP— Erik Horman (Connor Zilisch, Kieran Brosnan), 16:53.
Second period: APP— Matthew Baker (Zilisch, Horman), 2:18.
Third period: APP— Zilisch, 9:32. APP— Ethan Baker, 14:23. FDL— Sabel, 16:39.
Saves: APP— Gage Olson, 27. FDL— TJ Draves, 20.