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Novak Djokovic, of Serbia, returns to Nikolay Davydenko, of Russia, during the third round of the U.S. Open tennis tournament in New York, Saturday, Sept. 3, 2011. (AP Photo/Elise Amendola)

Associated Press
Novak Djokovic, of Serbia, returns to Nikolay Davydenko, of Russia, during the third round of the U.S. Open tennis tournament in New York, Saturday, Sept. 3, 2011. (AP Photo/Elise Amendola)
Novak Djokovic, of Serbia, returns to Nikolay Davydenko, of Russia, during the third round of the U.S. Open tennis tournament in New York, Saturday, Sept. 3, 2011. (AP Photo/Elise Amendola)
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