Juan Martin del Potro, of Argentina, rests on the net after losing a point during the second set against Novak Djokovic, of Serbia, in the quarterfinal round of play at the U.S. Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Charles Krupa)

Associated Press
Juan Martin del Potro, of Argentina, rests on the net after losing a point during the second set against Novak Djokovic, of Serbia, in the quarterfinal round of play at the U.S. Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Charles Krupa)
Juan Martin del Potro, of Argentina, rests on the net after losing a point during the second set against Novak Djokovic, of Serbia, in the quarterfinal round of play at the U.S. Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Charles Krupa)
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