WIMBLEDON, ENGLAND - JUNE 29:  Novak Djokovic of Serbia serves during the men's singles fourth round match against Dudi Sela of Israel on Day Seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 29, 2009 in London, England. Getty Images logo Getty Images 32 months ago

WIMBLEDON, ENGLAND - JUNE 29: Novak Djokovic of Serbia serves during the men's singles fourth round match against Dudi Sela of Israel on Day Seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 29, 2009 in London, England.