Mitch Marner's goal midway through the third period was the winner, and the Toronto Maple Leafs beat the Calgary Flames 4-3 on Tuesday night.

Marner scored Toronto’s fourth goal at 12:14 of the third period. With his assist on an Auston Matthews' goal, Marner has two goals and four assists in his last four games.

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Toronto Maple Leafs' Wayne Simmonds, left, checks Calgary Flames' Nikita Nesterov during the first period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Mitch Marner's goal midway through the third period was the winner, and the Toronto Maple Leafs beat the Calgary Flames 4-3 on Tuesday night.

Toronto Maple Leafs' Justin Holl, right, crashes over goalie Frederik Andersen, center, trying keep Calgary Flames' Matthew Tkachuk from the puck during the second period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Frederik Andersen stopped 23 of 26 shots for the win.

Toronto Maple Leafs' Zach Bogosian, left, checks Calgary Flames' Derek Ryan during the first period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Toronto coach Sheldon Keefe said Tuesday that Campbell will be sidelined for “weeks.”

Toronto Maple Leafs' Wayne Simmonds, left, scores on Calgary Flames goalie Jacob Markstrom during the first period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Maple Leafs: At Edmonton Oilers for two games, Thursday and Saturday.

Toronto Maple Leafs goalie Frederik Andersen, left, makes a save on Calgary Flames' Matthew Tkachuk during the second period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Toronto Maple Leafs goalie Frederik Andersen, left, makes a save on Calgary Flames' Matthew Tkachuk during the second period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Toronto Maple Leafs' Mitchell Marner, right, chases Calgary Flames' Andrew Mangiapane during the third period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Toronto Maple Leafs' Mitchell Marner, right, chases Calgary Flames' Andrew Mangiapane during the third period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Toronto Maple Leafs' Justin Holl, centre, plays the puck in between Calgary Flames' Noah Hanifin, left, and Matthew Tkachuk during the second period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Toronto Maple Leafs' Justin Holl, centre, plays the puck in between Calgary Flames' Noah Hanifin, left, and Matthew Tkachuk during the second period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Toronto Maple Leafs' John Tavares, right, checks Calgary Flames' Dominik Simon during the third period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Toronto Maple Leafs' John Tavares, right, checks Calgary Flames' Dominik Simon during the third period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Matthews also had a goal and an assist for the Maple Leafs (6-2-0). Wayne Simmonds and Travis Boyd also scored for Toronto. Defenseman Morgan Rielly had a pair of assists.

Toronto Maple Leafs' Wayne Simmonds, left, checks Calgary Flames' Nikita Nesterov during the first period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Toronto Maple Leafs' Wayne Simmonds, left, checks Calgary Flames' Nikita Nesterov during the first period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Frederik Andersen stopped 23 of 26 shots for the win.

Johnny Gaudreau scored twice for Calgary (2-2-1). Milan Lucic also scored and Jacob Markstrom stopped 17 shots in the loss.

Maple Leafs backup goaltender Jack Campbell was replaced in the lineup by Michael Hutchinson. Campbell injured his leg in the final minute of Sunday’s 3-2 win over the Flames when Matthew Tkachuk fell on him in a goal-mouth scrum.

Toronto Maple Leafs' Justin Holl, right, crashes over goalie Frederik Andersen, center, trying keep Calgary Flames' Matthew Tkachuk from the puck during the second period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Toronto Maple Leafs' Justin Holl, right, crashes over goalie Frederik Andersen, center, trying keep Calgary Flames' Matthew Tkachuk from the puck during the second period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Toronto coach Sheldon Keefe said Tuesday that Campbell will be sidelined for “weeks.”

NOTES: After enjoying the gentlest schedule to start the season of any team in the all-Canadian Scotia North Division, the Flames will play 21 games in the next 40 days. ... The Maple Leafs wore No. 10 patches on their chests in memory of George Armstrong, who captained Toronto to four Stanley Cups in the 1960s and died this week at age 90. Every Leaf wore No. 10 and “Armstrong” on their back during warm-up. ... Flames winger Dillon Dube was scratched for a second straight game with an upper-body injury.

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Toronto Maple Leafs' Zach Bogosian, left, checks Calgary Flames' Derek Ryan during the first period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Toronto Maple Leafs' Zach Bogosian, left, checks Calgary Flames' Derek Ryan during the first period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Maple Leafs: At Edmonton Oilers for two games, Thursday and Saturday.

Flames: At Montreal Canadiens for two games, Thursday and Saturday.

More AP NHL: https://apnews.com/NHL and https://twitter.com/AP_Sports

Toronto Maple Leafs' Wayne Simmonds, left, scores on Calgary Flames goalie Jacob Markstrom during the first period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Toronto Maple Leafs' Wayne Simmonds, left, scores on Calgary Flames goalie Jacob Markstrom during the first period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Toronto Maple Leafs goalie Frederik Andersen, left, makes a save on Calgary Flames' Matthew Tkachuk during the second period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Toronto Maple Leafs goalie Frederik Andersen, left, makes a save on Calgary Flames' Matthew Tkachuk during the second period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Toronto Maple Leafs' Mitchell Marner, right, chases Calgary Flames' Andrew Mangiapane during the third period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Toronto Maple Leafs' Mitchell Marner, right, chases Calgary Flames' Andrew Mangiapane during the third period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Toronto Maple Leafs' Justin Holl, centre, plays the puck in between Calgary Flames' Noah Hanifin, left, and Matthew Tkachuk during the second period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Toronto Maple Leafs' Justin Holl, centre, plays the puck in between Calgary Flames' Noah Hanifin, left, and Matthew Tkachuk during the second period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Toronto Maple Leafs' John Tavares, right, checks Calgary Flames' Dominik Simon during the third period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)

Toronto Maple Leafs' John Tavares, right, checks Calgary Flames' Dominik Simon during the third period of an NHL hockey game, Tuesday, Jan. 26, 2021 in Calgary, Alberta. (Jeff McIntoshThe Canadian Press via AP)