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MELBOURNE, AUSTRALIA - JANUARY 21: Pablo Carreno Busta of Spain greets Kei Nishikori of Japan after their men's singles match on day eight of the Australian Open tennis tournament in Melbourne on January 21, 2019. (Photo by Recep Sakar/Anadolu Agency/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 21: Pablo Carreno Busta of Spain greets Kei Nishikori of Japan after their men's singles match on day eight of the Australian Open tennis tournament in Melbourne on January 21, 2019.  (Photo by Recep Sakar/Anadolu Agency/Getty Images)