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MELBOURNE, AUSTRALIA - JANUARY 27: Stan Wawrinka of Switzerland plays a backhand in his fourth round match against Daniil Medvedev of Russia on day nine of the 2020 Australian Open at Melbourne Park on January 27, 2020 in Melbourne, Australia. (Photo by TPN/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 27: Stan Wawrinka of Switzerland plays a backhand in his fourth round match against Daniil Medvedev of Russia on day nine of the 2020 Australian Open at Melbourne Park on January 27, 2020 in Melbourne, Australia. (Photo by TPN/Getty Images)