LONDON, ENGLAND - JUNE 26: Denis Kudla of the United States hits a backhand return during his Gentlemen's Singles second round match against Kei Nishikori of Japan on day four of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club at Wimbledon on June 26, 2014 in London, England. (Photo by Al Bello/Getty Images)
