MELBOURNE, AUSTRALIA - JANUARY 15 : Kei Nishikori of Japan celebrates during day 2 of the Australian Open on January 15 2019, at Melbourne Park in Melbourne, Australia.(Photo by Jason Heidrich/Icon Sportswire via Getty Images)
MELBOURNE, AUSTRALIA - JANUARY 15 : Kei Nishikori of Japan celebrates during day 2 of the Australian Open on January 15 2019, at Melbourne Park in Melbourne, Australia.(Photo by Jason Heidrich/Icon Sportswire via Getty Images)