Ignacio Piatti scored in the 73rd minute and the visiting Montreal Impact beat Toronto FC 1-0 Saturday to end the Reds' unbeaten streak at seven games.
Piatti picked up Dominic Oduro's feed and beat goalkeeper Alex Bono for his 14th goal of the season.
Toronto had a chance to tie it in the 87th minute, but Tosaint Ricketts put his header off the side of the goal.
Montreal (9-7-10) won for the first time in MLS play at BMO Field, snapping an 0-3-3 stretch.
Toronto (12-8-7) had won five straight at home.
FC Dallas 3, Dynamo 1 • In Houston, Michael Barrios scored twice, including the go-ahead goal in the 60th minute, and FC Dallas beat Houston.