BRIDGEVIEW, Ill. (AP) — Patrick Nyarko justified his first MLS start with an early goal to give the Chicago Fire a 1-0 win over Chivas USA on Saturday night, then left due to a head injury before halftime.

It was an eventful night for the former Virginia Tech player, who got a concussion after he and Chivas defender Claudio Suarez knocked heads in first-half stoppage time. Suarez was being evaluated.

The Fire got to 29 points, within four of Eastern Conference leader New England, though Columbus is between them with 31.

DYNAMO 2, CREW 0: At Houston, Brad Davis scored in the 13th minute and Brian Ching followed a half hour later to help Houston extend its unbeaten streak to five games.

Houston climbed to 26 points, within one of first place Real Salt Lake in the Western Conference.

Columbus lost for the first time in three games and stayed on 31, missing a chance to overtake idle New England (33) for first place in the East.

D.C. UNITED 2, WIZARDS 0: At Washington, Luciano Emilio scored his 11th goal of the season and Jaime Moreno had a goal and an assist.

United won for the fifth time in six MLS games and took sole possession of fourth place in the Eastern Conference with 25 points. Zach Wells recorded his first shutout in 16 games this season.

Emilio took a crossing pass in the 28th minute from Moreno and, after switching the ball from his right foot, blasted a shot with his left into the lower left corner. Emilio is now tied for second in goals in the MLS with Edson Buddle of Los Angeles and Kenny Cooper of Dallas.