Novak Djokovic, of Serbia, smiles at the top of the Empire State Building in New York, Tuesday Sept. 13, 2011. Djokovic defeated Rafael Nadal Sunday to win his first U.S. Open tennis championship and third Grand Slam trophy of the year. (AP Photo/Seth Wenig)

Associated Press
Novak Djokovic, of Serbia, smiles at the top of the Empire State Building in New York, Tuesday Sept. 13, 2011. Djokovic defeated Rafael Nadal Sunday to win his first U.S. Open tennis championship and third Grand Slam trophy of the year. (AP Photo/Seth Wenig)
Novak Djokovic, of Serbia, smiles at the top of the Empire State Building in New York, Tuesday Sept. 13, 2011. Djokovic defeated Rafael Nadal Sunday to win his first U.S. Open tennis championship and third Grand Slam trophy of the year. (AP Photo/Seth Wenig)
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