Novak Djokovic of Serbia celebrates winning his match against Brazil's Rogerio Dutra Silva in the third round of play at the 2012 US Open tennis tournament, Friday, Aug. 31, 2012, in New York. (AP Photo/Mike Groll)

Associated Press
Novak Djokovic of Serbia celebrates winning his match against Brazil's Rogerio Dutra Silva  in the third round of play at the 2012 US Open tennis tournament,  Friday, Aug. 31, 2012, in New York. (AP Photo/Mike Groll)
Novak Djokovic of Serbia celebrates winning his match against Brazil's Rogerio Dutra Silva in the third round of play at the 2012 US Open tennis tournament, Friday, Aug. 31, 2012, in New York. (AP Photo/Mike Groll)
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