Seven games were on the Major League Soccer schedule for Saturday.
Ignacio Piatti scored twice (PK-13', 50') as the Montreal Impact dominated the visiting, ten-man Portland Timbers 4-1.
David Accam scored the only goal of the match in the 52nd minute as the Chicago Fire handed DC United their third straight defeat 1-0 on the road.
Harry Shipp scored the only goal of the match in the 42nd minute as the Seattle Sounders defeated visiting Real Salt Lake 1-0.
In Atlanta United's 4-1 home domination of the Houston Dynamo, Miguel Almiron delivered the hosts' first-ever hat trick (30', 42', PK-80').
At Chester, Pennsylvania:
C.J. Sapong (67') and Haris Medunjanin (75') each scored a goal as the Philadelphia Union came from behind to register a franchise-record fourth straight win, 2-1 over the visiting Colorado Rapids.
At Vancouver, British Columbia:
Christian Techera (40') and Tim Parker (67') each scored once as the Vancouver Whitecaps blanked visiting Sporting Kansas City 2-0.
At Frisco, Texas:
Jahmir Hyka scored the game's lone goal in the 81st minute while David Bingham made three saves to preserve both the shutout and the victory as the San Jose Earthquakes knocked off previously-unbeaten FC Dallas 1-0 on the road.