The LaSalle Vipers continue to fight for their playoff lives tonight, while the Flyers and Maroons play a pivotal game.
LaSalle is home for Game 6 after thumping London 7-3 on the road last night.
The Vipers faced a 3-2 deficit in their first round series against Sarnia as well.
Chatham and Leamington are knotted at two games a piece, as their series shifts to Leamington for Game 5.
The Flyers got the best of Chatham in Chatham last night, 3-1.
The road team has won each of the first four games in the series.