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MELBOURNE, AUSTRALIA - JANUARY 31: Austria's Dominic Thiem (L) and Alexander Zverev of Germany greet each other after their men's singles semi-final match on day twelve of the Australian Open tennis tournament in Melbourne on January 31, 2020. (Photo by Recep Sakar/Anadolu Agency via Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 31: Austria's Dominic Thiem (L) and Alexander Zverev of Germany greet each other after their men's singles semi-final match on day twelve of the Australian Open tennis tournament in Melbourne on January 31, 2020.
 (Photo by Recep Sakar/Anadolu Agency via Getty Images)