Roger Federer of Switzerland returns a shot to Novak Djokovic of Serbia during a semifinal match at the U.S. Open tennis tournament in New York, Saturday, Sept. 10, 2011. (AP Photo/Charlie Riedel)

Associated Press
Roger Federer of Switzerland returns a shot to Novak Djokovic of Serbia during a semifinal match at the U.S. Open tennis tournament in New York, Saturday, Sept. 10, 2011. (AP Photo/Charlie Riedel)
Roger Federer of Switzerland returns a shot to Novak Djokovic of Serbia during a semifinal match at the U.S. Open tennis tournament in New York, Saturday, Sept. 10, 2011. (AP Photo/Charlie Riedel)
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