LONDON, ENGLAND - JUNE 27:  Novak Djokovic of Serbia clutches his shoulder which he injured after a fall during his Gentlemen's Singles third round match against Gilles Simon of France on day five of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 27, 2014 in London, England.  (Photo by Al Bello/Getty Images)