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France's Arthur Rinderknech returns to Filip Krajinovic of Serbia during the quarter final match of the Generali Open Tennis Tournament of the ATP Tour in Kitzbuehel, Austriaon July 29, 2021. - Austria OUT (Photo by Lukas HUTER / APA / AFP) / Austria OUT (Photo by LUKAS HUTER/APA/AFP via Getty Images)

France's Arthur Rinderknech returns to Filip Krajinovic of Serbia during the quarter final match of the Generali Open Tennis Tournament of the ATP Tour in Kitzbuehel, Austriaon July 29, 2021. - Austria OUT (Photo by Lukas HUTER / APA / AFP) / Austria OUT (Photo by LUKAS HUTER/APA/AFP via Getty Images)