Novak Djokovic of Serbia poses with the Norman Brookes Challenge Cup in the gardens of Government House the morning after defeating Stefanos Tsitsipas of Greece in the men's singles final at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 30, 2023. Djokovic has now won ten Australian Open titles. (AP Photo/Mark Baker)

Novak Djokovic of Serbia poses with the Norman Brookes Challenge Cup in the gardens of Government House the morning after defeating Stefanos Tsitsipas of Greece in the men's singles final at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 30, 2023. (AP Photo/Mark Baker)

Novak Djokovic of Serbia poses with the Norman Brookes Challenge Cup in the gardens of Government House the morning after defeating Stefanos Tsitsipas of Greece in the men's singles final at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 30, 2023.Djokovic also returned to the world number one in the rankings today. (AP Photo/Mark Baker)

Novak Djokovic of Serbia poses with the Norman Brookes Challenge Cup in the gardens of Government House the morning after defeating Stefanos Tsitsipas of Greece in the men's singles final at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 30, 2023.Djokovic also returned to the world number one in the rankings today. (AP Photo/Mark Baker)

Novak Djokovic of Serbia poses with the Norman Brookes Challenge Cup in the gardens of Government House the morning after defeating Stefanos Tsitsipas of Greece in the men's singles final at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 30, 2023.Djokovic has now won ten Australian Open titles (AP Photo/Ng Han Guan)

Novak Djokovic of Serbia holds the Norman Brookes Challenge Cup aloft in the gardens of Government House the morning after defeating Stefanos Tsitsipas of Greece in the men's singles final at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 30, 2023. (AP Photo/Ng Han Guan)

Novak Djokovic of Serbia poses with the Norman Brookes Challenge Cup in the gardens of Government House the morning after defeating Stefanos Tsitsipas of Greece in the men's singles final at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 30, 2023. Djokovic has now won ten Australian Open titles. (AP Photo/Ng Han Guan)

Novak Djokovic of Serbia poses with the Norman Brookes Challenge Cup in the gardens of Government House the morning after defeating Stefanos Tsitsipas of Greece in the men's singles final at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 30, 2023.Djokovic also returned to the world number one in the rankings today. (AP Photo/Ng Han Guan)

Novak Djokovic of Serbia reacts during a press conference following his win over Stefanos Tsitsipas of Greece in the men's singles final at the Australian Open tennis championship in Melbourne, Australia, early Monday, Jan. 30, 2023. (AP Photo/Dita Alangkara)

Novak Djokovic of Serbia reacts during a press conference following his win over Stefanos Tsitsipas of Greece in the men's singles final at the Australian Open tennis championship in Melbourne, Australia, early Monday, Jan. 30, 2023. (AP Photo/Dita Alangkara)

Novak Djokovic of Serbia gestures during a press conference following his win over Stefanos Tsitsipas of Greece in the men's singles final at the Australian Open tennis championship in Melbourne, Australia, early Monday, Jan. 30, 2023.(AP Photo/Dita Alangkara)

Novak Djokovic of Serbia gestures during a press conference following his win over Stefanos Tsitsipas of Greece in the men's singles final at the Australian Open tennis championship in Melbourne, Australia, early Monday, Jan. 30, 2023.(AP Photo/Dita Alangkara)

Novak Djokovic of Serbia reacts during a press conference following his win over Stefanos Tsitsipas of Greece in the men's singles final at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 30, 2023.(AP Photo/Dita Alangkara)

Novak Djokovic of Serbia reacts during a press conference following his win over Stefanos Tsitsipas of Greece in the men's singles final at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 30, 2023.(AP Photo/Dita Alangkara)

Novak Djokovic of Serbia reacts during a press conference following his win over Stefanos Tsitsipas of Greece in the men's singles final at the Australian Open tennis championship in Melbourne, Australia, early Monday, Jan. 30, 2023.(AP Photo/Dita Alangkara)

Novak Djokovic of Serbia smiles during a press conference following his win over Stefanos Tsitsipas of Greece in the men's singles final at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 30, 2023.(AP Photo/Dita Alangkara)

Novak Djokovic of Serbia reacts during a press conference following his win over Stefanos Tsitsipas of Greece in the men's singles final at the Australian Open tennis championship in Melbourne, Australia, early Monday, Jan. 30, 2023. (AP Photo/Dita Alangkara)

Supporters of Novak Djokovic of Serbia react outside Rod Laver Arena following his win over Stefanos Tsitsipas of Greece in the men's singles final at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 29, 2023 (AP Photo/Ng Han Guan)

Supporters of Novak Djokovic of Serbia react outside Rod Laver Arena following his win over Stefanos Tsitsipas of Greece in the men's singles final at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 29, 2023 (AP Photo/Ng Han Guan)

Supporters of Novak Djokovic of Serbia react outside Rod Laver Arena following his win over Stefanos Tsitsipas of Greece in the men's singles final at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 29, 2023(AP Photo/Ng Han Guan)