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Timo Boll of Germany returns the ball during a men's singles round of 16 match against Uda Yukiya of Japan at the 2019 ITTF Czech Open in Olomouc, the Czech Republic, Aug. 23, 2019. (Xinhua/Shan Yuqi)

Timo Boll of Germany returns the ball during a men's singles round of 16 match against Uda Yukiya of Japan at the 2019 ITTF Czech Open in Olomouc, the Czech Republic, Aug. 23, 2019. (Xinhua/Shan Yuqi)