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17th January 2019, Melbourne Park, Melbourne, Australia; Australian Open Tennis, day 4; Kei Nishiroki of Japan reacts to a lost point during his match against Ivo Karlovic of Croatia (Photo by NaFoto/Action Plus via Getty Images)

17th January 2019, Melbourne Park, Melbourne, Australia; Australian Open Tennis, day 4; Kei Nishiroki of Japan reacts to a lost point during his match against Ivo Karlovic of Croatia (Photo by NaFoto/Action Plus via Getty Images)