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MELBOURNE, AUSTRALIA - JANUARY 21: Nick Kyrgios of Australia and Grigor Dimitrov of Bulgaria embrace after their fourth round match on day seven of the 2018 Australian Open at Melbourne Park on January 21, 2018 in Melbourne, Australia. (Photo by XIN LI/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 21:  Nick Kyrgios of Australia and Grigor Dimitrov of Bulgaria embrace after their fourth round match on day seven of the 2018 Australian Open at Melbourne Park on January 21, 2018 in Melbourne, Australia.  (Photo by XIN LI/Getty Images)