Rask protected the lead by making 19 saves in the first two periods. He got some help from McAvoy, who prevented a puck from going into the net by hitting it in midair after it went off the post and the goalie's back.
"It's a team effort," Rask said. "The game starts a certain way and then there might be a penalty kill. You know you may have to make a save and you try to keep it tight and hopefully trust your teammates that they're going to get that first goal, get that lead, and then kind of let that ball roll from that."
The Bruins extended the lead to 2-0 at 2:31 of the third period, when Carlo scored with a knuckling wrist shot from the right point that bounced off the ice and went into the net off Binnington's blocker.
Kuhlman, who was playing for the first time since April 30, scored his first NHL playoff goal at 10:15 to make it 3-0, shooting high on the blocker side from the top of the right circle.