Trent Frederic scored twice, and Linus Ullmark made 23 saves for Boston (24-8-6), which has won five of its past six games.
“I really liked our third period. I thought we were smart,” Bruins coach Jim Montgomery said. “We didn’t give up an odd-man rush. We had numbers everywhere, and we kept hanging on to pucks in the offensive zone, making them defend so they didn’t have much energy to go the other way.”
Nikita Kucherov had a goal and two assists, and Brayden Point scored twice for Tampa Bay (19-17-5), which has lost four of its past six games. Andrei Vasilevskiy made 20 saves.
“Penalties hurt us early, kind of took the wind out of our sails,” Lightning coach Jon Cooper said. “We got ourselves back. I don’t know, it was a weird game. A lot of weird pucks going in the net. … Boston’s a heck of a team, but I don’t know, for us, we felt that could have been a winnable game, and you look up at the scoreboard and it’s 7-3. So, a little bit of a headshaker for me.”