Tim Schaller gave the Bruins their first goal after he crashed the net to deflect the puck past goalie Andrei Vasilevskiy. That spot is now occupied by the Boston Bruins (48-17-11), who now have 107 points to Tampa Bay's 106 while having played one fewer game than their Sunshine State foes.
The Boston Bruins have claimed first place in the Eastern Conference.
Postseason implications were apparent throughout, including a rare fight for Pastrnak in the third period and Rask unloading a flurry of punches on Cory Conacher of Tampa Bay during a scrum in the second.
David Pastrnak notched Boston's second goal on the power play just 32 seconds later.
The score would be 2-1 Bruins till the third period when Patrice Bergeron scored his 28th goal of the season to make it 3-1 Bruins.
The Lightning cut it to 3-2 when Hedman beat Rask through his legs with 6:06 remaining. For at least two nights, the B's will be in control of the top seed in the Eastern Conference after defeating the Tampa Bay Lightning 4-2 on Thursday night at TD Garden.
50s today, then a frigid Easter weekend
Rain will shift to the east and out of the area by noon but clouds will stick around most of the day with highs near 50. The threat of heavy rain is over, but the light rain that's fallen all afternoon has continued this evening.
With the win, Boston changes its playoff destiny, now drawing the New Jersey Devils in a first-round matchup if the playoffs started today rather than the Toronto Maple Leafs. Wingels took the puck away from Ryan McDonagh and exchanged passes with Schaller.
The Bruins are 10-2-3 in their last 15 games, the first 13 of those games without Bergeron.
BLACKHAWKS: Defenseman Brent Seabrook played in his 1,000th National Hockey League regular-season game.
The game paused for a few minutes with 8:44 left in the second after Rask took a few shots at Conacher when he was slow to get up after getting tangled with Brandon Carlo in the crease. "He (Rask) stood up for himself and obviously guys will jump in if necessary". Boston fans roared their approval by shouting "Tuuuuuuuuk!" throughout the altercation. Boston improved to 7-1-0 in its past eight against Tampa Bay.
The team announced Wednesday that Zdeno Chara has signed a one-year contract extension that will pay him $5 million in base salary in the 2018-19 season. Tampa Bay coach Jon Cooper entered the game with 239 wins, tied with John Tortorella for most in franchise history.
But at this point, it's hard to imagine anyone in the East being able to hold this Bruins team back.