CALGARY -- Brad Marchand scored with 1:24 remaining in overtime to give the Boston Bruins a 2-1 win against the Calgary Flames at Scotiabank Saddledome on Monday.
Marchand deked goaltender David Rittich before sliding the puck five-hole to give Boston its 12th win in 15 games (12-3-0).
"[Riley Nash] made a great play to get it up," Marchand said. "When I got in, I wanted to shoot it, but [Rittich] didn't look like he was going to bite at all, so I made a move and it went in."
[WATCH: All Bruins vs. Flames highlights]
David Pastrnak scored, and Tuukka Rask made 28 saves for the Bruins (36-13-8, 80 points), who trail the Tampa Bay Lightning by one point for first place in the Atlantic Division with two games in hand. Boston, which lost 6-1 at the Vancouver Canucks on Saturday, has not lost consecutive games since Dec. 14-16.
Video: BOS@CGY: Pastrnak rips shot short side past Rittich
"I think it starts at the top with leadership, and just having that constant belief we can do it, we can get the job done regardless of who we're playing against," Nash said. "I think it's just that constant belief from the top down that we'll pull it out."
Matthew Tkachuk scored, and Rittich made 31 saves for the Flames, who have lost seven of their past eight games at home (1-3-4).
"It's frustrating," Tkachuk said. "They're a really good team. Didn't give us many chances at all. The ones that we did get, we've got to capitalize. We did a good job of limiting … I don't think we gave up a ton either. It was a pretty solid game, but it [stinks] when you can't pull out the win."
Video: BOS@CGY: Tkachuk jams home rebound for PPG
Calgary (30-21-9, 69 points) is two points behind the Los Angeles Kings for third place in the Pacific Division. It also trails the Minnesota Wild by two points for the second wild card into the Stanley Cup Playoffs from the Western Conference.
Pastrnak scored to put the Bruins ahead 1-0 at 5:59 of the first period after a turnover by Flames defenseman TJ Brodie.
Tkachuk tied the game 1-1 with a power-play goal at 5:28 of the second period. The goal, off the rebound of a Sean Monahan shot, came on Calgary's sixth shot on goal of the game.
Rittich stopped Pastrnak on a breakaway at 6:10 of the third period to keep the game tied.
"That team is a hard team to beat," Flames coach Glen Gulutzan said. "Look across the League, not many teams are beating them. You can't really beat them without goaltending. We got it tonight and gave us a chance. We had great goaltending."
Goal of the game
Marchand's goal at 3:36 of overtime.
Video: BOS@CGY: Marchand goes five-hole for OT winner
Save of the game
Rask stopping Sam Bennett at 2:18 of overtime.
Video: BOS@CGY: Rask denies Bennett twice in overtime
Highlight of the game
Rittich's save on Pastrnak at 6:10 of the third period.
Video: BOS@CGY: Rittich stretches to deny Pastrnak's break
They said it
"First 40 (minutes), we played really well, really limited their opportunities. They had a few chances, but that's what [goalie Tuukka Rask] is there for. If we can continue to sustain that for 60 minutes every night we're going to be a really good team, really hard to play against." -- Bruins forward Brad Marchand
"There are games where we lost where we played good games. Mentally, it's hard, when you lose a game, you think you maybe have to change something or do something different, and that's not necessarily the case." -- Flames defenseman TJ Brodie
Need to know
Marchand's goal was his first since Jan. 23. … Rask, who is 6-0-3 in nine games against the Flames, is 21-2-2 with a 1.79 goals-against average and .935 save percentage since Nov. 29. … Bergeron has eight points (five goals, three assists) in his past six games and 28 (17 goals, 11 assists) in his past 21. ... Flames forward Johnny Gaudreau helped set up Tkachuk's goal and reached 50 assists in a season for the first time in his NHL career. … Calgary forward Morgan Klimchuk had one hit and one takeaway in 7:25 in his NHL debut, and defenseman Travis Hamonic played his 500th NHL game.
Bruins: At the Edmonton Oilers on Tuesday (9 p.m. ET; SNW, NESN, NHL.TV)
Flames: At the Vegas Golden Knights on Wednesday (10:30 p.m. ET; ATTSN-RM, SNF, NHL.TV)
Video: Marchand lifts Bruins to OT win against Flames, 2-1