Alex Pietrangelo scored the tiebreaking goal in the third period, leading the defending champion Blues to a 3-2 victory over the Toronto Maple Leafs on Monday night.

Oskar Sundqvist and Brayden Schenn also scored and Jordan Binnington stopped 32 shots to help St. Louis improve to 2-0-1 this season.

On the decisive goal at 7:51 of the third, David Perron found a pinching Pietrangelo, who beat a down-and-out Frederik Andersen from a tight angle at the bottom of the faceoff circle for his second of the season. Pietrangelo also earned his 400th career point and 23rd game-winner to break a tie with Al MacInnis for the most by a defenseman in franchise history.

Frederik Gauthier and William Nylander scored for Toronto, which has dropped two straight (2-1-1). Andersen finished with 26 saves.

The Blues opened the scoring at 8:30 of the second when Sundqvist - the Blues' fourth-line center - moved in on Andersen and fired a slap shot from the top of the faceoff circle that defenseman Tyson Barrie tried to block with his stick.

The Maple Leafs tied it when Jason Spezza batted a puck out of the air to Gauthier, who banged in his second of the season with 8:26 left.

Fans at Scotiabank barely had a chance to sit back down when they were on their feet again 24 seconds later when Nylander finished off a beautiful passing play with Cody Ceci and Andreas Johnsson for his second.

The Blues are at Ottawa on Thursday night.