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US player Sam Querrey returns to Serbia's Novak Djokovic during their men's singles third round match on the fifth day of the 2016 Wimbledon Championships at The All England Lawn Tennis Club in Wimbledon, southwest London, on July 1, 2016. / AFP / GLYN KIRK / RESTRICTED TO EDITORIAL USE (Photo credit should read GLYN KIRK/AFP via Getty Images)

US player Sam Querrey returns to Serbia's Novak Djokovic during their men's singles third round match on the fifth day of the 2016 Wimbledon Championships at The All England Lawn Tennis Club in Wimbledon, southwest London, on July 1, 2016. / AFP / GLYN KIRK / RESTRICTED TO EDITORIAL USE        (Photo credit should read GLYN KIRK/AFP via Getty Images)