David Pastrnak scored at the 4:22 mark of overtime as the Boston Bruins erased a pair of two-goal deficits to beat the host Calgary Flames 4-3 on Tuesday night.

Pastrnak skated into the right circle with Charlie McAvoy's drop feed and whipped the game-winning goal off the post past Calgary netminder Dustin Wolf.

Elias Lindholm netted Boston's opening goal and added an assist against his former team, while Morgan Geekie and Marc McLaughlin each scored in the third to extend the game beyond 60 minutes.

Jeremy Swayman made 20 saves for the Bruins, who dropped the first two games of a five-game road trip but have won back-to-back games and six of eight overall.

All three Calgary goals came in the second period, with Matt Coronato and Nazem Kadri tallying in a 27-second span to open the scoring. Ryan Lomberg's first goal as a Flame made it 3-1 entering the second intermission.

Wolf made 31 stops for Calgary, which has split its last four contests (2-1-1).

Boston had a 35-23 shots advantage, recording 15 in the third period and four more in overtime, and won 68 percent of its faceoffs.

The Bruins quickly erased their two-goal deficit in the third, beginning with Geekie's rebound at the 4:14 mark. McLaughlin brought Boston even for the first time at 6:51, scoring a rebound goal off his own one-time attempt in the slot following a Brad Marchand centering pass.

Boston pressured through the third, but Swayman helped keep the game tied when he saved Jakob Pelletier's backhander on a short-handed breakaway halfway through the period.

Coronato scored first only 54 seconds into the middle period. Blake Coleman's feed found the Harvard University product open just inside the left circle, where he beat Swayman blocker side.

Quickly doubling the score, Kadri took Jonathan Huberdeau's centering pass and buried it past the screened goaltender for his fourth goal in as many games at 1:21.

Lindholm brought Boston within 2-1 at 6:31, driving down the left side and towards the crease to break a wrister through Wolf.

Lomberg, who won the Stanley Cup with the Florida Panthers last season, raced down the middle of the rink and scored off a deflection of Connor Zary's shot from the left side at 17:19.

--Field Level Media