CHESTER, Pennsylvania (AP) — Chris Pontius scored in the 78th minute to lift D.C. United to their fourth straight victory with a 1-0 win over the Philadelphia Union on Saturday night.
D.C. United moved four points ahead of the New York Red Bulls for first place in the Eastern Conference. It's their first four-game winning streak since the 2008 season.
The struggling Union haven't won in six outings since a 1-0 victory over Chivas USA on April 21.
A sellout crowd of 18,876 showed up at PPL Park for the debut of interim manager John Hackworth, who was promoted when Peter Nowak stepped down on Wednesday after two-plus seasons.
Hackworth was an assistant coach under Nowak since the Union's inception in 2010.
At Vancouver, British Columbia, Sebastien Le Toux's goal in the 80th-minute gave undermanned Vancouver victory over Colorado.
Vancouver won while playing a man down after striker Darren Mattocks was sent off in the 60th minute following his second yellow card.
The Whitecaps posted their seventh victory of the season, surpassing the six they mustered in their 2011 expansion season. Vancouver moved to 25 points, six clear of Colorado in the Western Conference standings.
Davide Chiumiento created the game's only goal after his clever dribble evaded three defenders and his cross found Le Toux's who's sliding volley beat Colorado keeper Matt Pickens.
At Houston, Adam Moffat scored his first goal of the season in the 76th minute to give Houston a 2-1 win over 10-man FC Dallas.
Moffat knocked home the rebound after FC Dallas goalkeeper Kevin Hartman couldn't clear a Brad Davis corner kick.
FC Dallas played the last 26 minutes with just 10 players after Jair Benitez was given a red card for hitting Dynamo midfielder Colin Clark in the head. The incident provoked a minor melee between both teams, but cooler heads prevailed.
Earlier, Dynamo striker Will Bruin opened the scoring in the third minute before Jackson Goncalves equalized in the 59th minute. Gonclaves took advantage of Scott Sealy's initial shot cannoning off Dynamo Houston defender Jermaine Taylor to place the rebound past 'keeper Tally Hall.
At Montreal, Felipe Martin, Justin Mapp, Andrew Wenger and Lamar Neagle all scored to help Montreal beat 10-man Seattle.
Eddie Johnson scored for the Sounders who were reduced to 10 men in the 57th minute when Jhon Kennedy Hurtado was sent off for a nasty tackle on Collen Warner.
Patrice Bernier created three of the Impact's goals to help Montreal end a two-game losing streak.
Bernier made a quick move at the right side of the area and slipped the ball to Martin at the top of the box to curl a shot inside the far post in the 18th minute.
Mapp scored 6 minutes into the second half when he took a long pass from Bernier and cut most of the way across the front of the penalty area before firing a low shot inside the left post.
At Foxborough, Massachusetts, Andy Gruenebaum made five saves for his fifth cleansheet of the season to help Columbus to a scoreless draw against New England.
The Crew are unbeaten in six matches and extended their unbeaten streak five against the Revolution.
Columbus move to 19 points from 13 matches, with New England two points further back in seventh place the Eastern Conference.
Matt Reis had three saves for New England for his third cleansheet of the season and 58th of his career. The Revolution had scored in six straight matches and totaled 12 goals in their previous six at home.
At Kansas City, C.J. Sapong and Julio Cesar scored in the first half to help Sporting beat Toronto FC, spoiling the debut of new manager Paul Mariner.
Mariner, who had been Toronto's director of player development, took over last week when Aron Winter was fired after just one win in his first 10 games.
Sapong put Kansas City up 1-0 in the 18th minute, scoring from close range after a cross from Jacob Peterson, and Julio Cesar added another in the 35th when he volleyed home Graham Zusi's corner kick from the top right corner of the 6-yard box.
Zusi's assist moved him back into a share of the MLS lead with Dwayne De Rosario of D.C. United.
At Carson, California, Fabian Espindola scored two goals to help Real Salt Lake beat Chivas USA 3-0.
Espindola put Real Salt Lake up in the 41st minute after Kyle Beckerman's 35-yard pass found the Argentine, who eluded Chivas defender Danny Califf to head in the opening goal.
Espindola added another goal in the 54th minutes when Ned Grabavoy found him mid-run. Espindola then beat defender Rauwshan McKenzie before scoring his second of the night.
Salt Lake added a third goal in stoppage time when midfielder Will Johnson hit his first of the season.