BOSTON (AP) – Scottie Upshall scored with 9.9 seconds left in overtime Thursday night to lift the Philadelphia Flyers to a 4-3 win over the Boston Bruins, who got 51 saves from Tim Thomas.

Joni Pitkanen, R.J. Umberger and Mike Richards had the other Flyers’ goals. Philadelphia snapped a five-game losing streak.

Mark Mowers ended his stretch of 27 games without a goal by scoring a pair for Boston, and defenseman Zdeno Chara had his 10th of the season.

Martin Biron, acquired from Buffalo on Tuesday for a second-round pick in the 2007 draft, made 34 saves in his Flyers’ debut. He made a right pad save on Petr Tenkrat’s clean breakaway bid with just under 15 minutes to play.

Upshall, sent in on a partial breakaway on a pass from Pitkanen, slipped around defenseman Andrew Ference before shifting to his backhand and putting the puck behind Thomas for the game-winner.

The Bruins, outshot 55-37, have allowed more than 50 shots on goal in two of their last three games. Boston dropped its third straight after a four-game winning streak seemingly got it back in the playoff race.

Boston jumped ahead 1-0 on Mowers’ first goal of the game – and his first since Dec. 29 – 4:10 into the opening period. They made it 2-0 when Mowers beat Biron with a wrister from the right circle 3:59 later.

Mowers, who entered the night with just two goals all season, also went 24 games without a goal after scoring in Boston’s second game of the season.

The Flyers cut it to 2-1 on Pitkanen’s score midway into the opening period.

Philadelphia, which owned a 21-10 shot advantage in the second period, tied it 2-2 when Umberger scored off a rebound in front for a power-play goal at 4:53.

Richards completed a 2-on-1 break for a short-handed score by beating Thomas inside the right post before he could get across, making it 3-2 at 11:33.

Boston tied it at 3-3 on a two-man advantage at 12:36 when the 6-foot-9 Chara scored out of a scramble in front by outmuscling a defender.

Boston’s newcomers Aaron Ward, acquired from the Rangers for defense Paul Mara on Tuesday, and Dennis Wideman, picked up from St. Louis for winger Brad Boyes, also before the trading deadline, saw their first action with the Bruins.

Notes: Mowers also had just two assists in his last 22 games. … Boston RW Glen Murray played after missing the last four with a groin injury. …The fans gave a loud ovation to the crew members of the USS John F. Kennedy, which is currently in Boston, when they were recognized on the video board. … It was a matchup of two of the league’s three teams that have allowed the most goals, with Philadelphia having given up the most overall.