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MELBOURNE, AUSTRALIA - JANUARY 30: Roger Federer of Switzerland plays a backhand during his Men's Singles Semifinal 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 Morgan Hancock/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 30: Roger Federer of Switzerland plays a backhand during his Men's Singles Semifinal 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 Morgan Hancock/Getty Images)