LONDON, ENGLAND - JUNE 27: Kei Nishikori of Japan during a pratice session prior to the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 27, 2015 in London, England. (Photo by Shaun Botterill/Getty Images)
LONDON, ENGLAND - JUNE 27: Kei Nishikori of Japan during a pratice session prior to the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 27, 2015 in London, England. (Photo by Shaun Botterill/Getty Images)