Paul Byron and Jonathan Drouin scored in the shootout as the Montreal Canadiens beat the Pittsburgh Penguins 4-3 on Saturday night.

Tomas Tatar had two goals and an assist, and Brendan Gallagher had a goal and an assist for the Canadiens. Antti Niemi stopped 25 shots through overtime in his first start of the season.

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Pittsburgh Penguins' Bryan Rust (17) moves in on Montreal Canadiens goaltender Antti Niemi as Canadiens' Noah Juulsen defends during the third period of an NHL hockey game, Saturday, Oct. 13, 2018 in Montreal.  (Graham HughesCanadian Press via AP)

Paul Byron and Jonathan Drouin scored in the shootout as the Montreal Canadiens beat the Pittsburgh Penguins 4-3 on Saturday night.

Pittsburgh Penguins goaltender Casey DeSmith is scored on by Montreal Canadiens' Jonathan Drouin during the shootout in an NHL hockey game, Saturday, Oct. 13, 2018 in Montreal.  (Graham HughesCanadian Press via AP)

After Byron and Drouin both beat DeSmith blocker side in the shootout, Sidney Crosby had to score for Pittsburgh to send it to the third round but he hit the outside of the post.

Pittsburgh Penguins' Sidney Crosby moves in on Montreal Canadiens goaltender Antti Niemi during the third period of an NHL hockey game, Saturday, Oct. 13, 2018 in Montreal.  (Graham HughesCanadian Press via AP)

The Canadiens came out buzzing in the second period, scoring three straight goals before Kessel tied it again. Montreal outshot Pittsburgh 19-4 in the second.

Pittsburgh Penguins goaltender Casey DeSmith makes a save against Montreal Canadiens' Max Domi during the overtime period of an NHL hockey game, Saturday, Oct. 13, 2018 in Montreal.  (Graham HughesCanadian Press via AP)

Tatar got his second of the game, on the power play, by firing the puck off DeSmith and in from the side of the net at 8:51 to push Montreal ahead.

Montreal Canadiens goaltender Antti Niemi makes a save against Pittsburgh Penguins' Sidney Crosby during the shootout in an NHL hockey game, Saturday, Oct. 13, 2018 in Montreal.  (Graham HughesCanadian Press via AP)

It looked like the Canadiens had taken a 4-3 lead in the third period when defenseman Victor Mete put the puck past DeSmith, but the goal was called back for goaltender interference on Andrew Shaw after a challenge by Penguins coach Mike Sullivan.

Pittsburgh Penguins goaltender Casey DeSmith is pressured by Montreal Canadiens' Artturi Lehkonen (62) as Penguins' Olli Maatta defends during the first period of an NHL hockey game, Saturday, Oct. 13, 2018 in Montreal.  (Graham HughesCanadian Press via AP)

Penguins: Host Vancouver on Tuesday night.

Dominik Simon, Kris Letang and Phil Kessel scored in regulation for the Penguins, and Casey DeSmith had 37 saves through overtime.

Pittsburgh Penguins' Bryan Rust (17) moves in on Montreal Canadiens goaltender Antti Niemi as Canadiens' Noah Juulsen defends during the third period of an NHL hockey game, Saturday, Oct. 13, 2018 in Montreal.  (Graham HughesCanadian Press via AP)

Pittsburgh Penguins' Bryan Rust (17) moves in on Montreal Canadiens goaltender Antti Niemi as Canadiens' Noah Juulsen defends during the third period of an NHL hockey game, Saturday, Oct. 13, 2018 in Montreal. (Graham HughesCanadian Press via AP)

After Byron and Drouin both beat DeSmith blocker side in the shootout, Sidney Crosby had to score for Pittsburgh to send it to the third round but he hit the outside of the post.

The Canadiens beat the Penguins for the second time in eight days, winning 5-1 in Pittsburgh last Saturday.

Simon and Letang scored in the first period to give the Penguins a 2-0 lead. Daniel Sprong fed Simon in front of the goal with a one-handed scoop pass and the 24-year-old beat Niemi on the backhand at 3:13. Letang doubled Pittsburgh's lead with 4:44 left with a shot on Niemi's blocker side.

Pittsburgh Penguins goaltender Casey DeSmith is scored on by Montreal Canadiens' Jonathan Drouin during the shootout in an NHL hockey game, Saturday, Oct. 13, 2018 in Montreal.  (Graham HughesCanadian Press via AP)

Pittsburgh Penguins goaltender Casey DeSmith is scored on by Montreal Canadiens' Jonathan Drouin during the shootout in an NHL hockey game, Saturday, Oct. 13, 2018 in Montreal. (Graham HughesCanadian Press via AP)

The Canadiens came out buzzing in the second period, scoring three straight goals before Kessel tied it again. Montreal outshot Pittsburgh 19-4 in the second.

Just 11 seconds into the middle period, Tatar beat Letang to a loose puck in front of the net, then fired past DeSmith for his first in a Canadiens uniform.

Gallagher tied it 2-2 at 7:38 after jumping on a rebound of Jeff Petry's point shot.

Pittsburgh Penguins' Sidney Crosby moves in on Montreal Canadiens goaltender Antti Niemi during the third period of an NHL hockey game, Saturday, Oct. 13, 2018 in Montreal.  (Graham HughesCanadian Press via AP)

Pittsburgh Penguins' Sidney Crosby moves in on Montreal Canadiens goaltender Antti Niemi during the third period of an NHL hockey game, Saturday, Oct. 13, 2018 in Montreal. (Graham HughesCanadian Press via AP)

Tatar got his second of the game, on the power play, by firing the puck off DeSmith and in from the side of the net at 8:51 to push Montreal ahead.

With the Pens on a man advantage, Kessel made it 3-3 from the slot at 11:14.

Montreal failed to score on a 5-on-3 power play that lasted 1:49 to end the second period.

Pittsburgh Penguins goaltender Casey DeSmith makes a save against Montreal Canadiens' Max Domi during the overtime period of an NHL hockey game, Saturday, Oct. 13, 2018 in Montreal.  (Graham HughesCanadian Press via AP)

Pittsburgh Penguins goaltender Casey DeSmith makes a save against Montreal Canadiens' Max Domi during the overtime period of an NHL hockey game, Saturday, Oct. 13, 2018 in Montreal. (Graham HughesCanadian Press via AP)

It looked like the Canadiens had taken a 4-3 lead in the third period when defenseman Victor Mete put the puck past DeSmith, but the goal was called back for goaltender interference on Andrew Shaw after a challenge by Penguins coach Mike Sullivan.

NOTES: Montreal also had a goal overturned in its previous, also due to goalie interference against Shaw, in its 3-0 loss to Los Angeles. ... Pittsburgh D Justin Schultz left the game in the first period and did not return. Schultz's leg folded awkwardly as fell to the ice after taking a hit by Tomas Plekanec, who was making his 999th career start.

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Montreal Canadiens goaltender Antti Niemi makes a save against Pittsburgh Penguins' Sidney Crosby during the shootout in an NHL hockey game, Saturday, Oct. 13, 2018 in Montreal.  (Graham HughesCanadian Press via AP)

Montreal Canadiens goaltender Antti Niemi makes a save against Pittsburgh Penguins' Sidney Crosby during the shootout in an NHL hockey game, Saturday, Oct. 13, 2018 in Montreal. (Graham HughesCanadian Press via AP)

Penguins: Host Vancouver on Tuesday night.

Canadiens: Host Detroit on Monday night.

More AP NHL: www.apnews.com/tag/NHL and www.twitter.com/AP_Sports

Pittsburgh Penguins goaltender Casey DeSmith is pressured by Montreal Canadiens' Artturi Lehkonen (62) as Penguins' Olli Maatta defends during the first period of an NHL hockey game, Saturday, Oct. 13, 2018 in Montreal.  (Graham HughesCanadian Press via AP)

Pittsburgh Penguins goaltender Casey DeSmith is pressured by Montreal Canadiens' Artturi Lehkonen (62) as Penguins' Olli Maatta defends during the first period of an NHL hockey game, Saturday, Oct. 13, 2018 in Montreal. (Graham HughesCanadian Press via AP)