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MELBOURNE, AUSTRALIA - JANUARY 30: Novak Djokovic of Serbia shakes hands with Roger Federer of Switzerland after their Men's Singles Semifinal match on day eleven of the 2020 Australian Open at Melbourne Park on January 30, 2020 in Melbourne, Australia. (Photo by Hannah Peters/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 30: Novak Djokovic of Serbia shakes hands with Roger Federer of Switzerland after their Men's Singles Semifinal match on day eleven of the 2020 Australian Open at Melbourne Park on January 30, 2020 in Melbourne, Australia. (Photo by Hannah Peters/Getty Images)