
MELBOURNE, AUSTRALIA - JANUARY 26: Novak Djokovic of Serbia celebrates after winning his men's singles match against Diego Schwartzman (not seen) of Argentina at Australia Open Grand Slam tennis tournament in Melbourne, Australia on January 26, 2020. Novak won the match with 3-0. ( Recep Şakar - Anadolu Agency )

MELBOURNE, AUSTRALIA - JANUARY 26: Novak Djokovic of Serbia celebrates after winning his men's singles match against Diego Schwartzman (not seen) of Argentina at Australia Open Grand Slam tennis tournament in Melbourne, Australia on January 26, 2020. Novak won the match with 3-0. ( Recep Şakar - Anadolu Agency )

MELBOURNE, AUSTRALIA - JANUARY 26: Novak Djokovic of Serbia in action against Diego Schwartzman (not seen) of Argentina during men's singles match at Australia Open Grand Slam tennis tournament in Melbourne, Australia on January 26, 2020. Novak won the match with 3-0. ( Recep Şakar - Anadolu Agency )

MELBOURNE, AUSTRALIA - JANUARY 26: Diego Schwartzman of Argentina in action against Novak Djokovic (not seen) of Serbia during men's singles match at Australia Open Grand Slam tennis tournament in Melbourne, Australia on January 26, 2020. Novak won the match with 3-0. ( Recep Şakar - Anadolu Agency )

MELBOURNE, AUSTRALIA - JANUARY 26: Novak Djokovic of Serbia in action against Diego Schwartzman (not seen) of Argentina during men's singles match at Australia Open Grand Slam tennis tournament in Melbourne, Australia on January 26, 2020. Novak won the match with 3-0. ( Recep Şakar - Anadolu Agency )

MELBOURNE, AUSTRALIA - JANUARY 26: Diego Schwartzman of Argentina in action against Novak Djokovic (not seen) of Serbia during men's singles match at Australia Open Grand Slam tennis tournament in Melbourne, Australia on January 26, 2020. Novak won the match with 3-0. ( Recep Şakar - Anadolu Agency )

MELBOURNE, AUSTRALIA - JANUARY 26: Novak Djokovic of Serbia in action against Diego Schwartzman (not seen) of Argentina during men's singles match at Australia Open Grand Slam tennis tournament in Melbourne, Australia on January 26, 2020. Novak won the match with 3-0. ( Recep Şakar - Anadolu Agency )

MELBOURNE, AUSTRALIA - JANUARY 26: Novak Djokovic of Serbia in action against Diego Schwartzman (not seen) of Argentina during men's singles match at Australia Open Grand Slam tennis tournament in Melbourne, Australia on January 26, 2020. Novak won the match with 3-0. ( Recep Şakar - Anadolu Agency )

MELBOURNE, AUSTRALIA - JANUARY 26: Diego Schwartzman of Argentina in action against Novak Djokovic (not seen) of Serbia during men's singles match at Australia Open Grand Slam tennis tournament in Melbourne, Australia on January 26, 2020. Novak won the match with 3-0. ( Recep Şakar - Anadolu Agency )