Serbian tennis player Novak Djokovic takes a break as he practices at Melbourne Park as questions remain over the legal battle regarding his visa to play in the Australian Open in Melbourne, Australia, January 13, 2022. The Australian government's decision to cancel Novak Djokovic's visa for a second time on Friday will shake up the Australian Open draw and could hand "Big Three" rival Rafa Nadal a boost in the race for the Grand Slam record. REUTERS/Asanka Brendon Ratnayake

Serbian tennis player Novak Djokovic practices at Melbourne Park as questions remain over the legal battle regarding his visa to play in the Australian Open in Melbourne, Australia, January 14, 2022. Top seed and defending champion Djokovic had been bracketed to play fellow Serbian Miomir Kecmanovic in the first round during the draw on Thursday. AAP Image/Diego Fedele via REUTERS

Serbian tennis player Novak Djokovic practices at Melbourne Park as questions remain over the legal battle regarding his visa to play in the Australian Open in Melbourne, Australia, January 13, 2022. REUTERS/Loren Elliott

Serbian tennis player Novak Djokovic practices at Melbourne Park as questions remain over the legal battle regarding his visa to play in the Australian Open in Melbourne, Australia, January 13, 2022. Djokovic's withdrawal could mean he loses the world number one ranking if second seed Daniil Medvedev or third seed Alex Zverev win the tournament. REUTERS/Loren Elliott

Serbian tennis player Novak Djokovic rests during a training session at Melbourne Park as questions remain over the legal battle regarding his visa to play in the Australian Open in Melbourne, Australia, January 14, 2022. AAP Image/Diego Fedele via REUTERS

Serbian tennis player Novak Djokovic practices at Melbourne Park as questions remain over the legal battle regarding his visa to play in the Australian Open in Melbourne, Australia, January 13, 2022. REUTERS/Loren Elliott