Russia's Daniil Medvedev gestures after defeating Serbia's Filip Krajinovic in their third round match at the Australian Open tennis championship in Melbourne, Australia,...

Spain's Rafael Nadal waits for a serve from Britain's Cameron Norrie during their third round match a the Australian Open tennis championships in Melbourne, Australia, Sa...

Serbia's Novak Djokovic celebrates after defeating Canada's Denis Shapovalov in their ATP Cup match in Melbourne, Australia, Tuesday, Feb. 2, 2021. (AP Photo/Hamish Blair...