An early second half own goal gave Dallas all three points over the Union in Texas.
Union match reports
Match Report: New England Revolution 1-3 Philadelphia Union
The Union returned to league action with a 3-1 victory in New England. Jim Curtin moves to 3-0-0 as interim Philadelphia coach.
Match Report: Philadelphia Union 2-1 New York Cosmos
The Union survived another extra time match, taking down the New York Cosmos 2-1 courtesy of a brace from Sebastien Le Toux to advance to the US Open Cup quarterfinals.
Match report: Philadelphia Union 3-1 Harrisburg City Islanders
It was ugly, but the Union fought back after going down a goal in the first half, finding an equalizer late in regulation time before scoring twice in the second period of extra time to advance to the fifth round of the US Open Cup.
Match Report: Philadelphia Union 3-3 Vancouver Whitecaps
In their final match before the World Cup break, the Union came from behind with an exhilarating comeback, but were forced to settle for a 3-3 draw.
Match report: Philadelphia Union 3-0 Chivas USA
Conor Casey got the job done for the Union, bagging a brace as the Union snapped their two-game losing streak, 3-0.