Roger Federer of Switzerland serves to David Ferrer of Spain during their 

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)
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