see more

LONDON, ENGLAND - JULY 02: Roger Federer of Switzerland on his knees during his Gentlemen's Singles quarter-final match against Stan Wawrinka of Switzerland on day nine of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club at Wimbledon on July 2, 2014 in London, England. (Photo by Jan Kruger/Getty Images)

LONDON, ENGLAND - JULY 02:  Roger Federer of Switzerland on his knees during his Gentlemen's Singles quarter-final match against Stan Wawrinka of Switzerland on day nine of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club  at Wimbledon on July 2, 2014 in London, England.  (Photo by Jan Kruger/Getty Images)