Roger Federer of Switzerland wipes his face with a towel during a break as he plays Novak Djokovic of Serbia during their ATP World Tour Tennis singles final match in London, Monday, Nov. 12, 2012. (AP Photo/Sang Tan)

Associated Press
Roger Federer of Switzerland wipes his face with a towel during a break as he plays  Novak Djokovic of Serbia during their ATP World Tour Tennis singles final match in London, Monday, Nov.  12, 2012. (AP Photo/Sang Tan)
Roger Federer of Switzerland wipes his face with a towel during a break as he plays Novak Djokovic of Serbia during their ATP World Tour Tennis singles final match in London, Monday, Nov. 12, 2012. (AP Photo/Sang Tan)
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