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DOHA, QATAR - MARCH 10: Roger Federer of Switzerland returns a backhand in his match against Dan Evans of Great Britain on Day 3 of the Qatar ExxonMobil Open at Khalifa International Tennis and Squash Complex on March 10, 2021 in Doha, Qatar. (Photo by Mohamed Farag/Getty Images)

DOHA, QATAR - MARCH 10: Roger Federer of Switzerland returns a backhand in his match against Dan Evans of Great Britain on Day 3 of the Qatar ExxonMobil Open at Khalifa International Tennis and Squash Complex on March 10, 2021 in Doha, Qatar. (Photo by Mohamed Farag/Getty Images)