MELBOURNE, AUSTRALIA - JANUARY 17: Novak Djokovic of Serbia serves to Jo-Wilfried Tsonga of France during day four of the 2019 Australian Open at Melbourne Park on January 17, 2019 in Melbourne, Australia. (Photo by TPN/Getty Images)"n"n
MELBOURNE, AUSTRALIA - JANUARY 17: Novak Djokovic of Serbia serves to Jo-Wilfried Tsonga of France during day four of the 2019 Australian Open at Melbourne Park on January 17, 2019 in Melbourne, Australia. (Photo by TPN/Getty Images)"n"n