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TORONTO, ON - AUGUST 09: Aslan Karatsev of Russia plays a shot during a first round doubles match with partner Dusan Lajovic of Serbia against Alex de Minaur of Australia and Cameron Norrie of Great Britain on Day One of the National Bank Open at Aviva Centre on August 09, 2021 in Toronto, Canada. (Photo by Vaughn Ridley/Getty Images)

TORONTO, ON - AUGUST 09:  Aslan Karatsev of Russia plays a shot during a first round doubles match with partner Dusan Lajovic of Serbia against Alex de Minaur of Australia and Cameron Norrie of Great Britain on Day One of the National Bank Open at Aviva Centre on August 09, 2021 in Toronto, Canada.  (Photo by Vaughn Ridley/Getty Images)