The New York Red Bulls extended their lead atop the Eastern Conference in MLS as Real Salt Lake moved top in the west.
In a battle between two of the competition's top teams on Sunday, the Red Bulls came from behind to draw 1-1 against the Seattle Sounders.
Brad Evans had given the Sounders the lead from the penalty spot on the stroke of half-time, but Australia international Tim Cahill levelled on 76 minutes.
Seattle won a penalty just before half-time when an Evans cross struck the arm of Swedish defender Markus Holgersson.
Evans stepped up to take the spot-kick, powerfully placing the penalty into the bottom corner and giving Luis Robles no chance.
Cahill equalised for the Red Bulls with a fine goal, curling his finish into the corner to earn his side a point.
The draw saw Seattle slip from top spot in the Western Conference as Real Salt Lake edged the Vancouver Whitecaps 1-0.
Devon Sandoval's ninth-minute opener was all they needed at BC Place Stadium in Vancouver.
Sporting Kansas City fell four points behind the Red Bulls after a 1-0 loss to the Philadelphia Union, who had Conor Casey strike in the first half.
Italian striker Marco Di Vaio scored his 19th league goal of the season but his Montreal Impact were held to a 2-2 draw at the Chicago Fire.
Mike Magee, second to Di Vaio in the scoring charts with 18, netted a brace for Chicago.
The Los Angeles Galaxy's indifferent season continued as they suffered a 1-0 loss to the Portland Timbers and New England and the Houston Dynamo drew 1-1.
The San Jose Earthquakes left it late to get past Chivas USA as Chris Wondolowski's 87th-minute goal gave them a 1-0 win.
Toronto conceded early before easing to a comfortable 4-1 win over DC United and the Columbus Crew were 4-2 victors at Dallas.