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MELBOURNE, AUSTRALIA - JANUARY 30: Roger Federer of Switzerland plays a backhand in his semi-final match against Novak Djokovic of Serbia on day eleven of the 2020 Australian Open at Melbourne Park on January 30, 2020 in Melbourne, Australia. (Photo by TPN/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 30: Roger Federer of Switzerland plays a backhand in his semi-final match against Novak Djokovic of Serbia on day eleven of the 2020 Australian Open at Melbourne Park on January 30, 2020 in Melbourne, Australia. (Photo by TPN/Getty Images)