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Jan-Lennard Struff of Germany celebrates victory after 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 celebrates victory after 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)