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MELBOURNE, AUSTRALIA - JANUARY 24: Stefanos Tsitsipas of Greece in action against Rafael Nadal (not seen) of Spain during Australian Open 2019 Men's Singles match in Melbourne, Australia on January 24, 2019. Nadal advanced to the final after winning 3-0. (Photo by Recep Sakar/Anadolu Agency/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 24: Stefanos Tsitsipas of Greece in action against Rafael Nadal (not seen) of Spain during Australian Open 2019 Men's Singles match in Melbourne, Australia on January 24, 2019. Nadal advanced to the final after winning 3-0. (Photo by Recep Sakar/Anadolu Agency/Getty Images)