The Leamington Flyers beat Strathroy 2-1 in overtime on Thursday to eliminate the Rockets in Game 5.
Thomas Michaud scored the game-winner for Leamington OT, and Dylan Weston scored once during regular play.
Leamington beat the Rockets 4-1 in the best-of-seven series.
The Flyers will now move on to the western conference semi-finals.