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MELBOURNE, AUSTRALIA - JANUARY 21: Novak Djokovic of Serbia in action against Daniil Medvedev of Russia during day eight of the 2019 Australian Open at Melbourne Park on January 21, 2019 in Melbourne, Australia. (Photo by Recep Sakar/Anadolu Agency/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 21: Novak Djokovic of Serbia in action against Daniil Medvedev of Russia during day eight of the 2019 Australian Open at Melbourne Park on January 21, 2019 in Melbourne, Australia. (Photo by Recep Sakar/Anadolu Agency/Getty Images)