Patrice Bergeron tied it with 51 seconds left in regulation then scored the game-winner 6:05 into overtime on Monday night to give Boston a 5-4 victory over the Maple Leafs in Game 7 as the Bruins turned back Toronto's comeback with a rally of their own.
Tuukka Rask stopped 24 shots for Boston, which led the best-of-seven series 3-1 before the Maple Leafs won two in a row to force a seventh game.
Toronto opened a 4-1 lead in the third period of the decisive game, but Boston cut the deficit to two midway through the third period and then scored twice in the final 82 seconds to force overtime.
James Reimer made 30 saves for the Maple Leafs. Cody Franson scored twice, and former Bruin Phil Kessel had a goal and an assist for Toronto.
The win completed a whipsaw of a weekend for Boston, which won Games 3 and 4 in Toronto last week to put the Maple Leafs on the brink of elimination, but failed to clinch at home on Friday and again in Game 6 when the series returned to the Air Canada Centre.
RANGERS 5, CAPITALS 0
Led by Henrik Lundqvist's 35 saves in a second consecutive shutout, and goals from some unlikely sources, New York beat Washington in Game 7 to reach the Eastern Conference semifinals.
New York contained Alex Ovechkin again and completed its comeback after trailing in the series 2-0 and 3-2 — the latest in Washington's long history of playoff collapses.
Sixth-seeded New York faces No. 4 Boston in the second round.
It is the first time New York won a Game 7 on the road in its history.
Arron Asham put New York ahead in the first period, before Taylor Pyatt and Michael Del Zotto made it 3-0 early in the second on goals 2:10 apart.
Ryan Callahan added a goal 13 seconds into the third period, and when Mats Zuccarello scored with about 13½ minutes remaining, thousands of red-clad fans streamed to the exits.