Serbia's Novak Djokovic celebrates with the trophy after winning his final match against Russia's Daniil Medvedev in Australian Open Men's Singles Final at Melbourne Park, Melbourne, Australia, February 21, 2021. Novak Djokovic beat Daniil Medvedev 7-5 6-2 6-2 to win a record-extending ninth Australian Open title. REUTERS/Asanka Brendon Ratnayake

Serbia's Novak Djokovic celebrates with the trophy after winning his final match against Russia's Daniil Medvedev in Australian Open Men's Singles Final at Melbourne Park, Melbourne, Australia, February 21, 2021. REUTERS/Loren Elliott

Serbia's Novak Djokovic celebrates with the trophy after winning his final match against Russia's Daniil Medvedev in Australian Open Men's Singles Final at Melbourne Park, Melbourne, Australia, February 21, 2021. REUTERS/Asanka Brendon Ratnayake

Serbia's Novak Djokovic celebrates with the trophy after winning his final match against Russia's Daniil Medvedev in Australian Open Men's Singles Final at Melbourne Park, Melbourne, Australia, February 21, 2021. REUTERS/Asanka Brendon Ratnayake

Serbia's Novak Djokovic celebrates with the trophy after winning his final match against Russia's Daniil Medvedev in Australian Open Men's Singles Final at Melbourne Park, Melbourne, Australia, February 21, 2021. REUTERS/Loren Elliott

Serbia's Novak Djokovic celebrates with the trophy after winning his final match against Russia's Daniil Medvedev in Australian Open Men's Singles Final at Melbourne Park, Melbourne, Australia, February 21, 2021. REUTERS/Loren Elliott