Ignacio Piatti completed the Montreal Impact's comeback with a stoppage-time winner from distance in a 2-1 victory at the Chicago Fire on Saturday.
Kennedy Igboananike opened the scoring for Chicago in the 29th minute with a fine curling effort from the side of the 18-yard box.
But Montreal were back level in the second half as Didier Drogba, who came on as a substitute minutes earlier, scored his first goal of the season with a backheeled finish.
Chicago went close to taking the lead again but Evan Bush did well to stop Alex Morrell's shot, and in the 91st minute Piatti's powerful shot from the corner of the box stole all three points for the Eastern Conference leaders.