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Jan-Lennard Struff of Germany returns a shot during the men's singles quarterfinal match of ATP Mercedes Cup tennis tournament against Lucas Pouille of France in Stuttgart, Germany, on June 14, 2019. (Xinhua/Philippe Ruiz)
Jan-Lennard Struff of Germany returns a shot during the men's singles quarterfinal match of ATP Mercedes Cup tennis tournament against Lucas Pouille of France in Stuttgart, Germany, on June 14, 2019. (Xinhua/Philippe Ruiz)