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DOHA, QATAR - JANUARY 10: Miomir Kecmanovic of Serbia returns the ball in his mens singles semifinal match against Andrey Rublev of Russia during day five of the ATP Qatar ExxonMobil Open at Khalifa International Tennis and Squash Complex on January 10, 2020 in Doha, Qatar. (Photo by Quality Sport Images/Getty Images)

DOHA, QATAR - JANUARY 10: Miomir Kecmanovic of Serbia returns the ball in his mens singles semifinal match against Andrey Rublev of Russia during day five of the ATP Qatar ExxonMobil Open at Khalifa International Tennis and Squash Complex on January 10, 2020 in Doha, Qatar. (Photo by Quality Sport Images/Getty Images)