Novak Djokovic (SRB) at practice at the 2021 Rolex Paris Masters at the Accor Arena in Paris, FRANCE, on OCTOBER 30, 2021.,Image: 640618889, License: Rights-managed, Restrictions: , Model Release: no, Credit line: Profimedia

MELBOURNE, AUSTRALIA - JANUARY 28: Novak Djokovic of Serbia arriving by car to the trophy presentation where he will receive the Norman Brookes Challenge Cup after winning the 2019 Australian Open at Picnic Point, Royal Botanical Gardens on January 28, 2019 in Melbourne, Australia. (Photo by James D. Morgan/Getty Images)

Defending men's champion Serbia's Novak Djokovic practices on Margaret Court Arena ahead of the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 13, 2022. AP Photo/Mark Baker)