The Montreal Impact stunned one of the hottest team's in MLS on Saturday by blanking Toronto FC 1-0 in the latest edition of the 401 Derby.

Ignacio Piatti's goal in the 73rd minute stood to be the winner. The Impact midfielder picked up a Dominic Oduro feed and beat a sprawling Alex Bono for his 14th goal of the season.

Toronto had an excellent chance to tie the game in the 87th minute, but Tosaint Ricketts put his header off the side of the goal.

The win is Montreal's (9-7-10) first since Aug. 6 -- a stretch of three games. It was also the Impact's first MLS victory at BMO Field, snapping an 0-3-3 stretch. With the three points, Montreal temporarily moves into a tie for fourth in the Eastern Conference.

The loss snaps Toronto's (12-8-7) stretch of five straight wins on home turf and the Reds' overall unbeaten streak at seven games. TFC remains in top seed in the East, but could be passed by New York City FC on Sunday.

Sebastian Giovinco was awarded a free kick in the 64th minute after being taken down just outside the area by Hernan Bernardello, however, Evan Bush was able to make the save. The Atomic Ant left the game soon after favouring his right leg following a challenge from Kyle Bekker and was replaced by Tsubasa Endoh.