Playing a day after rallying to beat Chicago at home, the Senators built their 3-0 lead in the opening 16:47.
After Pastrnak’s power-play goal late in the first period, Ottawa pushed to 5-1 just seven minutes into the second the two quick scores from Stutzle and Cozens. Boston coach Marco Sturm then lifted Korpisalo.
The Bruins were 8-1-1 following a loss their previous 10 times.
Stutzle outhustled Pavel Zacha in front before pushing the puck into the net to make it 4-1 and Cozens scored on a shot from the right point.
In the opening period, Batherson fired a wrister from the slot that Korpisalo seemed to miss trying to make a glove save just 90 seconds into the game.
Batherson outworked Bruins defenceman Andrew Peeke, battling for a loose puck in front of the crease before kicking it over to Giroux, who pushed it into the net with 6:16 left in the first.
Zetterlund then scored on a shot that didn’t seem to have much of an opening before slipping between Korpisalo’s right arm and the near post with 3:13 left in the period.
Skating with a two-man advantage, Pastrnak’s one-timer beat Ullmark with 53 seconds to go in the first.
UP NEXT
Senators: Host the Buffalo Sabres on Tuesday.
Bruins: Host the Montreal Canadiens on Tuesday.
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AP NHL: https://www.apnews.com/hub/NHL
Ken Powtak, The Associated Press