Slovakia's Martin Klizan talks with the physio before retiring during his men's singles first round match against Serbia's Novak Djokovic on the second day of the 2017 Wimbledon Championships at The All England Lawn Tennis Club in Wimbledon, southwest London, on July 4, 2017. / AFP PHOTO / Glyn KIRK / RESTRICTED TO EDITORIAL USE (Photo credit should read GLYN KIRK/AFP via Getty Images)
