Australian Open: Authorities cancel Novak Djokovic's visa due to lack of evidence of medical exemption. The world number one, whose vaccination status is unknown, spent the night at Melbourne airport and has been asked to leave the country - FILE - Novak Djokovic (SRB) during his first round match at the 2020 Australian Tennis Open at Melbourne Park in Melbourne, Australia, on January 20, 2020. Photo by Corinne Dubreuil/ABACAPRESS.COM

Novak Djokovic of Serbia in action during the Davis Cup Finals 2021, Semifinal 1, tennis match played between Croatia and Serbia at Madrid Arena pabilion on December 03, 2021, in Madrid, Spain. Novak Djokovic - Croatia - Davis Cup Finals 2021 - Semifinal 1, Madrid, Spain - 03 Dec 2021,Image: 646330197, License: Rights-managed, Restrictions: , Model Release: no, Credit line: Profimedia

Serbian tennis player Novak Djokovic (C), accompanied by his father Srdjan Djokovic (L) and his mother Dijana Djokovic, celebrates 311 weeks as world number one with his family and supporters in front of family restaurant "Novak" in Belgrade, on March 8, 2021. Novak Djokovic set a new landmark of 311 weeks as world number one on March 8, 2021, one week longer than Roger Federer whose tally of a record 20 Grand Slam titles is now firmly in the Serb's sights. "Big day today," the tennis superstar wrote on Twitter. Djokovic, 33, won his 18th major at the Australian Open in February.,Image: 596070758, License: Rights-managed, Restrictions: , Model Release: no, Credit line: Profimedia