The St. Thomas Stars have staved off elimination after beating the London Nationals 5-2 in Game 4 on Tuesday.
Max Vinogradov and James Turner scored the two goals for London.
London leads the best of seven series 3-1.
The Nationals will try again to close out the series in Game 5 on Wednesday at 7 p.m. in London.
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The Leamington Flyers topped the Strathroy Rockets 6-2 in Game 4.
Dylan Weston led Leamington with two goals, while Matthew Boring, Colton O'Brien, Michael Andrews and Wyatt O'Neil all scored once.
The Flyers now lead the Rockets 3-1 in the best of seven series.
The two teams face off in Game 5 on Thursday. The puck drops at 7:10 p.m. in Leamington.
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In Junior C playoff action, the Lakeshore Canadiens shutout the Essex 73's 1-0 in Game 1.
Eric Larue scored the sole goal of the game for Lakeshore.
The puck drops for Game 2 at 7 p.m. on Friday in Lakeshore.