The Crew (11-11-8) are 0-4-1 in the past five and trail Eastern Conference leader Houston by a point.

Landon Donovan, a second-half substitute, took a ball in the air from Omar Gonzalez on the right side of the penalty area and fired a hard shot that William Hesmer saved.

“Being opportunistic is pretty much what it comes down to,’’ Barrett said. “It was a header back in. I was running back from the previous attacking play. [Crew defender Julius] James just had a little mix up. Landon a great shot, put it on goal.’’

The rebound came to Barrett, who entered in the 84th minute, and he put it in from the left side.

“Hesmer made a great save and it fell right to me at the back post,’’ Barrett said. “If I hadn’t finished that I pretty much would have hated myself. I’m pretty happy.’’

Earlier, Josh Saunders had made three key saves in the final six minutes to give the Western Conference-leading Galaxy (17-3-10) 16 shutouts, one shy of the league mark. They are 5-0-1 in six games.

“We had chances. We didn’t capitalize,’’ Hesmer said. “We came out and took it to them. We were going to go down swinging and we did, unfortunately.’’

Dynamo 1, FC Dallas 0 - Geoff Cameron scored in the 87th minute as Houston (10-9-12) won on the road for the first time this season.

Dallas (13-10-7) was shut out for the third straight game.

Cameron scored on a header from outside the left side of the goalie’s box, Brad Davis assisted on the score with a cross coming off a corner kick. Houston goalkeeper Tally Hall finished with four saves to earn his fifth shutout of the season.

Dallas’s Andrew Jacobson had a goal disallowed in the 42d minute after George John was called for interfering with the goalkeeper.

FC Dallas held a 19-11 advantage in total shots. Dallas goalkeeper Kevin Hartman finished with three saves.

Red Bulls 2, Timbers 0 - Dane Richards scored in the first half and Luke Rodgers converted a penalty kick in the second half to lead host New York.

The Red Bulls (8-7-15) won at home for the first time since July 6.

Portland (10-13-7) dropped 2 points behind New York in the race for a wild-card berth. The loss snapped the Timbers’ five-game unbeaten streak (3-0-2). However, Portland has not had any success on the road, falling to 1-9-4 away from home.

D.C. United 4, Real Salt Lake 1 - Dwayne De Rosario scored the quickest hat trick in league history to spark United (9-8-11) in Washington.

De Rosario, who also became the first D.C. player to get multiple regular-season hat tricks, scored on a header in the 22d minute, got his second in the 27th, and converted a free kick in the 31st.

Rapids 1, Earthquakes 1 - Drew Moor scored in the 71st minute to lift host Colorado into a draw with San Jose.

San Jose goalkeeper Jon Busch stopped a shot by Jeff Larentowicz and the rebound came right to Moor, who sent the ball back into the net.

Colorado (10-9-12) ended a three-game losing streak but extended its winless streak to 0-3-2. The Rapids have been held to four goals in that stretch.

Chris Wondolowski scored in the 19th minute for San Jose (6-11-13), which is 0-1-2 over its last three and 0-5-4 in the last nine road games.

San Jose played without Sam Cronin, who missed the game with a yellow card accumulation.