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MELBOURNE, AUSTRALIA - JANUARY 30: Novak Djokovic of Serbia plays a forehand during his Men's Singles Semifinal match against Roger Federer of Switzerland on day eleven of the 2020 Australian Open at Melbourne Park on January 30, 2020 in Melbourne, Australia. (Photo by Mike Owen/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 30: Novak Djokovic of Serbia plays a forehand during his Men's Singles Semifinal match against Roger Federer of Switzerland on day eleven of the 2020 Australian Open at Melbourne Park on January 30, 2020 in Melbourne, Australia. (Photo by Mike Owen/Getty Images)