Ottawa, ON (SportsNetwork.com) - Bobby Ryan's late marker, coming after a potential Bruins' go-ahead goal was wiped out due to review, gave Ottawa a 4-3 victory over Boston in the back end of a home-and-home set.
Zack Smith, Patrick Wiercioch and Cory Conacher also tallied for the Senators, who avenged a 5-0 loss in Friday's opener and won for just the second time in their last six.
Craig Anderson came up with 29 saves for the win after being shelled for four scores in the third period at Boston.
Jarome Iginla, Daniel Paille and David Warsofsky scored for the Bruins, who fell short in their quest for a four-game win streak.
Tuukka Rask started, but was pulled after yielding three goals on 12 shots. Chad Johnson finished up with 17 saves, but allowed the winner.
"It would have been nice to come out of here with at least a point. I thought we deserved at least that much with how hard we competed to get back into the game," said Boston coach Claude Julien.
Warsofsky forged a 3-3 deadlock on his first career score at 6:36 of the third, and the Bruins were denied their first lead of the contest as a video review revealed that Iginla intentionally kicked in a puck at the left post near the midway point.
Ryan then gave the Senators a 4-3 edge when he beat Johnson with a backhander under the crossbar to cap a breakaway with 4:35 to play.
"There weren't that many chances in the third," said Ryan. "Truthfully I was just hoping that was going to be the game-winner."
The Bruins were all over Anderson with Johnson pulled and a power play in the final two minutes of regulation, but failed to come up with an equalizer despite several shots and more quality chances.
Wiercioch put the Sens on the board and put any hopes of another Rask shutout to rest on his shot from the left circle with 7:04 played in the first period.
Paille evened the score on a tremendous individual effort, beating Anderson through the pads from the left circle with 7:54 remaining, but Ottawa jumped back on top thanks to Conacher's tip of a rolling backhander by Kyle Turris at 14:28.
Smith's backhander gave the hosts a 3-1 edge just 29 seconds into the second, then Rask gave way to his backup. Iginla's tip of Milan Lucic's low shot pulled Boston within a goal at 13:51.
Ottawa has beaten Boston in back-to-back home dates (Nov. 15-Dec. 29) for the first time since doing so Jan. 9 and 27, 2007 ... Prior to the contest, the Bruins announced that defenseman Dennis Seidenberg will miss the remainder of the season after sustaining ACL and MCL injuries in Friday's 5-0 win over the Panthers ... Boston recalled forward Nick Johnson, defensemen David Warsofsky and Zach Trotman from Providence (AHL) on an emergency basis and assigned goaltender Niklas Svedberg to Providence.