BOSTON -- Patrice Bergeron scored the winning goal with 1:21 left in overtime after a replay review, lifting the surging Boston Bruins to a 2-1 win over the Ottawa Senators on Thursday night.
Nathan Horton scored the other goal for Boston, which won its fourth straight and was coming off a 4-1 road trip. The Bruins are 13-2-2 this season.
Tuukka Rask made 30 saves for the Bruins, including a pair of stellar stops in OT.
Jim O'Brien scored for the Senators, who had a five-game winning streak snapped.
Bergeron deflected a shot from the left circle that broke off Ottawa goalie Robin Lehner and trickled across the goal line. The crowd roared, the light went on and horn sounded, but the referee behind the net waved it off.
After a review, replays clearly showed the puck slid across when Lehner reached back and knocked it into the net before pulling it back out.
Lehner, recalled from the AHL on Feb. 22 after top goaltender Craig Anderson was sidelined with a sprained ankle, stopped 44 shots.
Rask's stops in overtime came on point-blank bids, the second coming off the stick of Kyle Turris' one-timer with just under 2 minutes left.
Bruins forward Milan Lucic was whistled for closing his hand on the puck with 32 seconds left in regulation when he fell on the ice behind the Senators' net, but Rask made a nice stop on Mika Zibanejad's bid from the point.
Boston took a 1-0 lead on Horton's goal 5:48 into the second period.
Ottawa tied it on O'Brien's power-play goal midway into the period, snapping Boston's streak of successfully killing off penalties at 27 straight.
With Ottawa's power play in the closing seconds, Kaspars Daugavins broke in on a clean breakaway. Rask made a right pad stop before David Krejci mishandled the rebound in a scramble in front before O'Brien slipped a shot into the net.
Midway into the second, Krejci split the defense and skated in for a backhand bid he fired wide while he was being hooked by Sergei Gonchar.
A little over 2 minutes after the Senators killed off Gonchar's penalty, Boston was whistled for too many men on the ice, setting the stage for O'Brien's tying goal.
The Senators lost some key pieces to their team, including defenseman Erik Karlsson, who is out for the season with a lacerated Achilles, and center Jason Spezza, also out for the season after back surgery. Top goaltender Anderson has missed the last three games with his sprained ankle.
But it hasn't slowed their play the past two weeks.
The Senators played the Bruins through a scoreless first period despite getting outshot 11-5. Neither team had any really good scoring chances.
NOTES: Lehnan had his only career shutout against the Bruins exactly one year ago, a 1-0 win at TD Garden. ... The Bruins opened a stretch of three home games in four days. They host Tampa Bay on Saturday and longtime rival Montreal Sunday night. ... Boston went 5-1 against Ottawa last season. ... Lehner, a backup the past two games, played in just his 14th career game. ... Anderson, injured last Thursday against the Rangers, entered the night with a league leading .952 save percentage.