CARSON, CA - SEPTEMBER 12: (L-R, Back to Front Row) Jeff Cunningham #9, Atiba Harris #16, goalkeeper Dario Sala #44, George John #14, Dave van den Bergh #7, Ugo Ihemelu #3, Pablo Ricchetti #6, Marvin Chavez #17, David Ferreira #10, Dax McCarty #13 and Jair Benitez #5 of FC Dallas pose for a team photo prior to the MLS match against the Los Angeles Galaxy at The Home Depot Center on September 12, 2009 in Carson, California. FC Dallas defeated the Galaxy 6-3. (Photo by Victor Decolongon/Getty Images)
Cunningham, who missed FC Dallas' 1-0 win over Houston on Wednesday due to a sore left knee, scored on a right-footed shot from 10 yards out.
Heath Pearce started the scoring sequence with a pass to David Ferreira who redirected the ball to a streaking Cunningham. Cunningham then scored his fourth goal of the season and FC Dallas (2-1-4) won its second straight.
United midfielder Kurt Morsink nearly tied it the 79th minute with a shot from outside the penalty circle that hit the crossbar. United (1-6-0) was shut out for the fifth time this season.
FC Dallas goalkeeper Kevin Hartman had four saves, including two within an 11-second span on shots by Danny Allsopp and Adam Cristman from within the penalty box.
FC Dallas did not get a shot on goal until Daniel Hernandez's shot from 25 yards away in the 50th minute before finishing with seven.
D.C. United goalie Bill Hamid finished with five saves in his second career MLS start.