HOUSTON (AP) -- Second-half substitute Danny Mwanga scored three minutes into stoppage time, and the Philadelphia Union came from behind to beat the Houston Dynamo 3-2 on Saturday night.

Sebastien Le Toux drove down the right side and cut into the box before feeding Mwanga in the middle of the goalkeeper's area. Mwanga did the rest, driving home the winner.

Mwanga fed Le Toux in the 69th minute to tie the score 2-2. Mwanga gave Le Toux a centering pass into the upper box, and Le Toux did the rest, freezing Houston goalkeeper Pat Onstad and nailing a bullet into the center net.

Philadelphia's win spoiled the return of Houston forward Brian Ching, who was not included on the U.S. national team roster for the World Cup. Ching entered the game as a sub to start the second half and paid immediate dividends, knotting the score 1-1 in the 52nd minute with a header into the net off a free kick by Brad Davis.

Houston (5-5-1) took a 2-1 lead in the 59th minute on a header by Eddie Robinson off another free kick by Davis, while Philadelphia (2-5-1) took a 1-0 lead in the 39th minute on a goal by Shea Salinas.