"We weren't clean with the puck early on," Bruins coach Bruce Cassidy said. "They bottled up the neutral zone, something we've seen of teams in the past here in Ottawa. It took us awhile to sort of get to our game, where we could get through there and establish a little something. But eventually we got there, and it took everybody. We found a way to win."
The Bruins have outscored opponents 23-9 during their winning streak and are 6-0-3 in their past nine games.
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Brad Marchand and Zdeno Chara scored in the third period for Boston (17-3-5), and Tuukka Rask made 33 saves for his fifth straight win.
"Best tandem in the League, in our opinion," Cassidy said of Rask and Jaroslav Halak, who made 36 saves in an 8-1 win against the Montreal Canadiens on Tuesday. "We feel that no matter who we put in there every night, the goaltending, very rarely they have an off night. Tuukka was certainly our best player, certainly early on. He made the saves he needed to and a couple late, for that matter."
Thomas Chabot scored, and Anders Nilsson made 19 saves for the Senators (11-13-1), who have lost two in a row in regulation for the first time since Oct. 19-21.
"I thought we worked really hard," Ottawa coach D.J. Smith said. "We made a couple of mistakes that ended up in our net, some real good players of theirs scored, we just didn't find a way to score on our chances, but I don't know if we can play much better through [the first] two periods."
Chabot took a pass between his legs from Chris Tierney through the neutral zone, broke in between two Bruins, and scored with a snap shot over Rask's glove to give the Senators a 1-0 lead 41 seconds into the third period. It was his second goal in three games.