Brayden Point scored his team-best 21st goal for the Lightning, who earned their eighth victory in their last nine contests.
Louis Domingue made 32 saves in his return to the Tampa Bay net after having his NHL-high 11-game goalie-start streak end in Detroit.
David Pastrnak scored a goal and added an assist for the Bruins, who lost their third straight. Boston dropped both games on its Florida road trip, including a 5-0 loss to the Panthers on Tuesday.
Rask recorded 27 saves.
Boston welcomed back top pairing defenseman Charlie McAvoy, who was activated from injured reserve earlier in the day. McAvoy sustained a concussion on Oct. 18 against Edmonton and had appeared in just seven games all season.
Top line center Colby Cave had a steal in the offensive zone and quickly put a shot on goal, and Pastrnak cleaned up the rebound for his 20th goal at 2:04. The goal was the third in the last 10 games for the right winger.
Point evened it at 14:59 in a mad scramble in front of Rask after Nikita Kucherov whipped a pass into the slot to the high-scoring center. Tyler Johnson also assisted on the marker.
Boston played a tighter game in the second period and led 12-6 in shots over the Lightning, but neither club could break the tie.
--Field Level Media
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