EXPLAINER: Novak Djokovic’s successful return to Australia


              Andrey Rublev of Russia reacts during a break in his quarterfinal against Novak Djokovic of Serbia at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 25, 2023. (AP Photo/Dita Alangkara)
            
              Novak Djokovic of Serbia plays a forehand return to Andrey Rublev of Russia during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 25, 2023. (AP Photo/Ng Han Guan)
            
              Novak Djokovic of Serbia holds up flowers as he leaves Rod Laver Arena after defeating Andrey Rublev of Russia in their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 25, 2023. (AP Photo/Ng Han Guan)
            Novak Djokovic of Serbia signs autographs after defeating Andrey Rublev of Russia in their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 25, 2023. (AP Photo/Dita Alangkara) Novak Djokovic of Serbia reacts as he leaves Rod Laver Arena after defeating Andrey Rublev of Russia in their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 25, 2023. (AP Photo/Ng Han Guan) 
              FILE  -Serbia's Novak Djokovic holds the Norman Brookes Challenge Cup after defeating Russia's Daniil Medvedev in the men's singles final at the Australian Open tennis championship in Melbourne, Australia, Sunday, Feb. 21, 2021.(AP Photo/Andy Brownbill, File)
            
              FILE - Recently deported from Australia for not being vaccinated against COVID-19, Novak Djokovic prepares to take his seat on a plane to Belgrade, in Dubai, United Arab Emirates, Monday, Jan. 17, 2022. Djokovic will be back in action at the Australian Open when the 2023 Grand Slam season begins next week. He was not able to play in the tournament he's won nine times a year ago because he was not vaccinated against COVID-19 and was deported from the country.  (AP Photo/Darko Bandic, File)