LONDON, ENGLAND - JULY 02:  Novak Djokovic of Serbia in action during his Gentlemen's Singles quarter-final match against Marin Cilic of Croatia on day nine of the Wimbledon Championships at the All England Lawn Tennis and Croquet Club at Wimbledon in London, England on July 2, 2014. (Photo by Yunus Kaymaz/Anadolu Agency/Getty Images)