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MELBOURNE, AUSTRALIA - JANUARY 19: Alexandr Dolgopolov of Ukraine plays a backhand in his third round match against Diego Schwartzman of Argentina on day five of the 2018 Australian Open at Melbourne Park on January 19, 2018 in Melbourne, Australia. (Photo by Scott Barbour/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 19:  Alexandr Dolgopolov of Ukraine plays a backhand in his third round match against Diego Schwartzman of Argentina on day five of the 2018 Australian Open at Melbourne Park on January 19, 2018 in Melbourne, Australia.  (Photo by Scott Barbour/Getty Images)