Danny Mwanga scored in the 73rd minute to give the Union a 1-1 tie with the Colorado Rapids on Saturday.
The rookie's seventh goal of the season came on an assist from Sebastien Le Toux.
Philadelphia is winless with three ties in its past five games.
Jeff Larentowicz scored from 30 yards in the 59th minute out after Union goalkeeper Chris Seitz stopped a shot but couldn't control the rebound.
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Copyright AP - Associated Press
