Novak Djokovic of Serbia plays a shot to Roger Federer of Switzerland during a semifinals match at the All England Lawn Tennis Championships at Wimbledon, England, Friday, July 6, 2012. (AP Photo/Anja Niedringhaus)

Associated Press
Novak Djokovic of Serbia plays a shot to Roger Federer of Switzerland during a semifinals match at the All England Lawn Tennis Championships at Wimbledon, England, Friday, July 6, 2012. (AP Photo/Anja Niedringhaus)
Novak Djokovic of Serbia plays a shot to Roger Federer of Switzerland during a semifinals match at the All England Lawn Tennis Championships at Wimbledon, England, Friday, July 6, 2012. (AP Photo/Anja Niedringhaus)
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