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MELBOURNE, AUSTRALIA - JANUARY 15: Kei Nishikori of Japan reacts in his first round match aginst Kamil Majchrzak of Poland during day two of the 2019 Australian Open at Melbourne Park on January 15, 2019 in Melbourne, Australia. (Photo by Fred Lee/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 15: Kei Nishikori of Japan reacts in his first round match aginst Kamil Majchrzak of Poland during day two of the 2019 Australian Open at Melbourne Park on January 15, 2019 in Melbourne, Australia. (Photo by Fred Lee/Getty Images)