Dwayne De Rosario did the damage in a 2-0 win, extending the 'Quakes' winless run to nine matches. Andy Najar was sent off late in the match.
Neither D.C. nor San Jose could make any serious incisions into the opposing defense, with the lone shot on target in the half coming from an Alan Gordon header that fell comfortably into the hands of Bill Hamid. United had a few threatening chances, registering six shots, but could not put any on target despite some shaky defending from the Earthquakes.
United took control in the second half, thanks to Dwayne De Rosario. The former Earthquake put his third team of the season ahead when he took advantage of a slip from Nana Attakora to get in behind the defense and easily beat Jon Busch in the 57th minute. Ten minutes later, the Canadian international struck again, side footing a finish into the far corner that gave Busch no chance.
The Earthquakes got a glimmer of hope when Andy Najar was shown a straight red card for tripping up Joey Gjertsen just outside the penalty area when Gjertsen was through on goal, though there were questions of offside on the play. However, the threat subsided as Tim Ward's subsequent free kick rebounded off the wall.
Chris Wondolowski had a one-on-one chance saved by Bill Hamid in the 80th minute, but other than that golden chance, the Earthquakes couldn't break down a sturdy D.C. United defense, as the visitors came away with a valuable win.