Novak Djokovic of Serbia poses with his trophy after beating Russia's Daniil Medvedev to win the Australian Open men's singles title in Melbourne, Australia, February 21, 2021. /CFP

Naomi Osaka of Japan lifts her trophy after beating Jennifer Brady of the U.S. to win the Australian Open women's singles title in Melbourne, Australia, February 20, 2021. /CFP

Elise Mertens (L) of Belgium and Aryna Sabalenka of Belarus jump to celebrate after winning Australian Open women's doubles title, February 19, 2021. /CFP

Ivan Dodig (R) of Croatia and new dad Filip Polasek of Slovakia jointly hold the trophy after winning their first Grand Slam doubles title at Australian Open, February 21, 2021. /CFP

Novak Djokovic of Serbia looks at a butterfly during his Australian Open match with Aslan Karatsev of Russia, February 18, 2021. /CFP

A butterfly lands on Japan's Naomi Osaka as she plays against Tunisia's Ons Jabeur during their Australian Open women's singles match, February 12, 2021. /CFP

An exhausted Rafael Nadal of Spain after his defeat at the Australian Open, February 17, 2021. /CFP

Serena Williams of U.S. squats to get ready for the ball during her Australian Open quarter-final match, February 16, 2021. /CFP

Dylan Alcott of Australia celebrates winning a match point during his quad-wheelchair singles final match with Sam Schroder (not pictured) of the Netherlands at Australian Open, February 17, 2021. /CFP

Former Australian Open champion Simona Halep of Romania covers her face with a tennis racket that has a heart shape on it during her match with Veronika Kudermetova (not pictured) of Russia at Australian Open, February 12, 2021. /CFP

Wang Yafan (L) of China reaches out to hit the ball while her teammate Makoto Ninomiya of Japan ready to action during their Australian Open women's doubles match, February 18, 2021. /CFP

Wang Qiang of China reacts to a match loss at Australian Open, February 8, 2021. /CFP

A spectator in the crowd catches a tennis ball in the Australian Open match between Daniil Medvedev of Russia and Stefanos Tsitsipas of Greece, February 19, 2021. /CFP