The Union will play at D.C. United on June 5.
Martinez scored in the fifth minute. Both clubs had to vacate the field in the 22nd minute because of lightning. The game was delayed 58 minutes. From there, it was all Philadelphia.
Adu scored on a header in the 29th minute and contributed a penalty kick in the 73rd.
The Rhinos of the USL Pro division are the only team outside of MLS to win this tournament since MLS teams began competing in 1996.
(Copyright 2011 Philadelphia Union. Reprinted by permission)