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Denis Shapovalov of Canada serves the ball during his ATP St. Petersburg Open 2020 international tennis tournament quarter-final match against Stan Wawrinka of Switzerland on October 16, 2020 at Sibur Arena in Saint Petersburg, Russia. (Photo by Mike Kireev/NurPhoto via Getty Images)

Denis Shapovalov of Canada serves the ball during his ATP St. Petersburg Open 2020 international tennis tournament quarter-final match against Stan Wawrinka of Switzerland on October 16, 2020 at Sibur Arena in Saint Petersburg, Russia. (Photo by Mike Kireev/NurPhoto via Getty Images)