Roger Federer of Switzerland, left, and Novak Djokovic of Serbia, right, leave the court after a semifinal match at the U.S. Open tennis tournament in New York, Saturday, Sept. 10, 2011. (AP Photo/Elise Amendola)

Associated Press
Roger Federer of Switzerland, left, and Novak Djokovic of Serbia, right, leave the court after a semifinal match at the U.S. Open tennis tournament in New York, Saturday, Sept. 10, 2011. (AP Photo/Elise Amendola)
Roger Federer of Switzerland, left, and Novak Djokovic of Serbia, right, leave the court after a semifinal match at the U.S. Open tennis tournament in New York, Saturday, Sept. 10, 2011. (AP Photo/Elise Amendola)
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