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15th January 2019, Melbourne Park, Melbourne, Australia; Australian Open Tennis, day 2; Kei Nishikori of Japan returns the ball during a match against Kamil Majchrzak of Poland (Photo by NaFoto/Action Plus via Getty Images)

15th January 2019, Melbourne Park, Melbourne, Australia; Australian Open Tennis, day 2; Kei Nishikori of Japan returns the ball during a match against Kamil Majchrzak of Poland (Photo by NaFoto/Action Plus via Getty Images)