CARSON, Calif. - Colorado took advantage of a Los Angeles' absence of international players and won 1-0 at the Galaxy on Saturday to cut the gap between the two teams to a single point.
That result and Seattle's home win over Chicago saw the Sounders move clear into second place in the Western Conference.
Sporting Kansas City went clear top of the Eastern Conference after a home win against Columbus, while there were also home victories for Dallas over Vancouver and Portland over Toronto.
Colorado's Edson Buddle scored the sole goal in the 75th minute, rocketing a shot into the upper-left corner of the net after Vicente Sanchez stripped Galaxy defender Todd Dunivant of the ball on Los Angeles' left wing.
The Galaxy, which was without Robbie Keane, Landon Donovan, Omar Gonzalez and Jaime Penedo on international duty, lost at home for the first time since early May.
Seattlle benefited from an own goal in the 89th minute to beat Chicago 2-1 and bring up its fourth straight win.
Gonzalo Segares ran back toward the goal to clear the ball and instead knocked it into the net.
Lamar Neagle also scored for Seattle and Mike Magee netted for Chicago, which has never beaten the Sounders and lost there for the fourth straight time.
Sporting Kansas City moved three points clear atop the East, ahead of New York and Montreal who play on Sunday, with a 3-0 win over Columbus.
Claudio Bieler converted a penalty in the first half for his first goal in nearly two months, while Soony Saad netted in the 41st and C.J. Sapong headed home in the 55th to complete the scoring.
Dallas' Mauro Diaz and Jair Benitez scored in the final five minutes to lift the hosts to a 3-1 win over Vancouver.
Daigo Kobayashi gave Vancouver the lead in the 4th minute but Je-Vaughn Watson equalized in the 8th.
The game remained deadlocked until the 87th when Diaz tapped a pass from Fabian Castillo into the centre of the net from inside 10 yards. Benitez added another goal with a looping volley from close to midfield that sailed over the head of the Whitecaps goalkeeper in the 90th.
Portland's Kalif Alhassan opened the scoring in first-half stoppage time and the Timbers rattled on three goals in the last 10 minutes to record a 4-0 win over Toronto.
Rodney Wallace, Will Johnson and Diego Valeri all scored in the late flurry to help Portland remain tied with Colorado for fourth place in the Western Conference.
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