FCD got second half goals from Fabian Castillo and Andres Escobar on their way to victory at Toyota Stadium.
Keeper Chris Seitz earned his second shutout, but the goalkeeper was kept busy throughout the first half. Billy Forbes broke through off to the right side of the six-yard box and attempted to pick out the back post, but Seitz got down to make a diving save. The deflection fell to a wide-open Eric Hassli but the Frenchman was unable to keep his shot on frame.
After the halftime break FCD was able to push a little harder towards goal. It wasn't until the 74th minute that FCD would find their break through goal. Andrew Jacobson helped started the play on the flank where he pushed a long ball to Castillo. The young Colombian brought down the ball and made one move to beat his defender as he then put a shot by the San Antonio keeper for the game's first goal.
FCD would double their lead just moments later in the 81st minute from Escobar. The Colombian winger raced up the flank on a give-and-go with David Texeira, who played a perfect ball back to Escobar. His shot by the San Antonio keeper was enough to push the lead to 2-0.
FC Dallas will now travel to Houston to face the Dynamo early next week. The winner of that match qualifies for the quarterfinal round of the 101-year-old tournament.