"They're a really good team, they play well at home," Boston forward Brad Marchand said. "We knew they were going to push back, they did, and they had a good game. We were right there; their goalie made some really big saves, so put it behind us and on to the next one."
Marleau scored at 3:49 of the second period to give the Maple Leafs a 2-1 lead after Mitchell Marner received a lead pass from Morgan Rielly to set up a 2-on-1 with Marleau.
The goal came 43 seconds after McQuaid tied it 1-1 at 3:06.
"[Marleau] scores goals at will when he gets around that net. He's got a good touch," said Marner, who had an assist on each of Marleau's goals playing on a line with center Tomas Plekanec. "He doesn't miss much, and we saw it here tonight. We need that going forward."
Chara tied it 2-2 with a sharp-angled shot below the left face-off circle at 6:19.
James van Riemsdyk gave the Maple Leafs a 1-0 lead when he scored on the power play with 2:55 left in the first period. It was his second goal of the series.
"That's the style of game that I expected, we expected," Bruins forward Patrice Bergeron said. "That's it. They got the win, and we have to be better next game. Adjust and adapt and be better."