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MELBOURNE, AUSTRALIA - JANUARY 19: Joao Sousa of Portugal plays a backhand in his third round match against Kei Nishikori of Japan during day six of the 2019 Australian Open at Melbourne Park on January 19, 2019 in Melbourne, Australia. (Photo by Julian Finney/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 19:  Joao Sousa of Portugal plays a backhand in his third round match against Kei Nishikori of Japan during day six of the 2019 Australian Open at Melbourne Park on January 19, 2019 in Melbourne, Australia.  (Photo by Julian Finney/Getty Images)