Mitch Marner scored with 51 seconds left in overtime the Maple Leafs a 5-4 win over the Bruins Tuesday night at TD Garden. It was one of the most demoralizing losses of the season for the reeling Bruins, who blew leads of 3-0 and 4-3 as Toronto scored three times in the third period.

The Bruins more than once had two points well within their grasp, but fell in overtime after a bad penalty changed the momentum.

Toronto had momentum after erasing the Bruins' three-goal lead until David Pastrnak stole the pick from Jake McCabe in the left-wing corner. With Matt Poitras cutting to the net, Pastrnak chose to keep it himself and flicked a wrist shot by Stolarz to put the Bruins head 4-3 with 9:27 left.