Marcus Johansson scored his second goal of the game on Frederik Andersen six and a half minutes into overtime as the Washington Capitals edged the Leafs 2-1 in Game 6 winning the series 4-2 with five of the six games decided in extra time.
Johansson pulled Washington even at 1-1 with less than eight minutes to go in the third period after Auston Matthews broke a scoreless tie with his fourth goal of the series for Toronto.
Washington will face the Pittsburgh Penguins in the second round for the second straight spring.