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LONDON, ENGLAND - JULY 04: Mikhail Kukushkin of Kazakhstan plays a forehand in his Men's Singles second round match against John Isner of The United States during Day four of The Championships - Wimbledon 2019 at All England Lawn Tennis and Croquet Club on July 04, 2019 in London, England. (Photo by Clive Brunskill/Getty Images)

LONDON, ENGLAND - JULY 04:  Mikhail Kukushkin of Kazakhstan plays a forehand in his Men's Singles second round match against John Isner of The United States during Day four of The Championships - Wimbledon 2019 at All England Lawn Tennis and Croquet Club on July 04, 2019 in London, England. (Photo by Clive Brunskill/Getty Images)