Desharnais, whose scoring drought even attracted the attention of Montreal's new mayor, perched in front of the net to redirect Josh Gorges' drive in the first period. The goal stood after a video review to determine whether Desharnais had scored with a high stick.
Travis Moen also scored his first of the season, and Daniel Briere added a goal for the Canadiens, who have won two straight.
Ovechkin scored on a last first-period power play and again in the third period to give him an NHL-leading 19 goals.
That was something I've been dreaming of, something I've told myself before the third period I was going to do ... It was an amazing feeling. It's hard to describe. I didn't believe it went in at first but when I saw all the reaction and all the fans going crazy and my teammates going crazy, it's just an unbelievable feeling. I didn't know what to do. I didn't know whether to jump or just skate and do a Theo Fleury. I don't think I'm the same caliber player he is so I couldn't do it.
— Flames forward Mikael Backlund on scoring the overtime winner against the Ducks in Gm. 3