Roger Federer of Switzerland serves to David Ferrer of Spain during their ATP World Tennis Finals singles match in London Thursday, Nov. 8, 2012. (AP Photo/Kirsty Wigglesworth)

Associated Press
Roger Federer of Switzerland serves to David Ferrer of Spain during their ATP World Tennis Finals singles match in London Thursday, Nov. 8, 2012. (AP Photo/Kirsty Wigglesworth)
Roger Federer of Switzerland serves to David Ferrer of Spain during their ATP World Tennis Finals singles match in London Thursday, Nov. 8, 2012. (AP Photo/Kirsty Wigglesworth)
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