OTTAWA - The Canadiens were bested 5-1 by the Senators on Wednesday night at the Canadian Tire Centre.
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It was the 10th meeting of the year between the two teams.
After scoring two consecutive game-winning goals in overtime, youngster Cole Caufield earned a promotion.
The 20-year-old American started the game on a line with Phillip Danault and Josh Anderson.
The Senators got on the scoreboard at the 11:35 mark of the first period.
Centreman Shane Pinto jumped on a rebound off a shot from defenseman Artem Zub and beat goaltender Jake Allen to give Ottawa a 1-0 lead.
It was Pinto's first career NHL goal. He was playing in his ninth game of the season.
The Canadiens tied things up with 32 seconds left in the first period.
Sharpshooter Tyler Toffoli hit a streaking Joel Edmundson, who scored his third goal of the year.
The veteran defenseman snapped a 20-game goal drought on the play.
With a helper on Edmundson's tally, centreman Nick Suzuki extended his point streak to seven games.
That's the way things stood after 20 minutes. Ottawa was leading 11-10 in shots.
The Senators went ahead 2-1 at the 3:44 mark of the second period.
Left all alone in the slot, winger Brady Tkachuk buried a feed from centreman Josh Norris for his 17th goal of the season.
The Senators doubled their advantage with eight seconds left in the frame.
Left-winger Nick Paul tipped a point shot from defenseman Erik Brannstrom for his fifth goal of the season.
For his part, Brannstrom collected his third assist of the night on the play.
Montreal trailed 3-1 at the break. Ottawa led 28-17 in shots after 40 minutes as well.
Connor Brown added another goal for the Senators at the 4:40 mark of the third period.
The right-winger was left all alone to the right of Allen and he buried Zub's feed with a one-timer.
It was his 19th goal of the season.
Then, Alex Formenton made it 5-1 for the Senators with his fourth goal of the campaign.
That's the way things ended.
Allen finished the game with 29 saves.
The Canadiens will be back in action on Thursday night when they visit the Toronto Maple Leafs at Scotiabank Arena.