Erik Kallgren, who made seven saves in relief in the third period, said he overheard a conversation between Samsonov and the training staff during the second period and began mentally preparing to come into the game.
"I felt pretty good, it's obviously not ideal coming in after two periods," Kallgren said. "I'd been sitting down for a long time so I was a little bit stiff and cold, but I got a few shots in the beginning and kind of got into it. It's definitely a little easier to get some time [knowing I'm coming in] trying to get as warm as I could."
Brad Marchand scored on a penalty shot for his 800th NHL point, and Linus Ullmark made 26 saves for the Bruins (10-2-0).
"I think Toronto checked better than we did tonight. It was hard for us to generate a lot of offense, so you have to tip your hat to them," Boston coach Jim Montgomery said. It was breakouts, we weren't very clean, and then just our puck decisions through the neutral zone making sure we were able to establish a forecheck, which we weren't able to."
Matthews put Toronto ahead 2-1 at 14:07 of the second period with a power-play goal. William Nylander carried the puck into the zone and rounded the net before finding Matthews at the top of the goal crease for a tap-in.
"It was a really nice play," Matthews said. "He just kind of went for a walk there and just tried to get open. He's got all the skill in the world to make plays and he sees the ice extremely well. I just tried to get open there and he put it right on a tee for me."
The Maple Leafs took a 1-0 lead at 7:19 of the first period. Michael Bunting kicked the puck to Matthews behind the net and Matthews backhanded a shot past Ullmark's blocker at the side of the net.
Matthews has scored in three straight games and has five goals in his past five games.
"I don't think we played with the puck as much as we'd like to, especially in the offensive zone," Bruins forward David Krejci said. "I guess we couldn't wear them down by the third period."
"We have to realize every time we play a game now that teams are going to be ready for us, so it was a good test for us. We have to learn from it and make sure we are as prepared as the other team now."