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Xu Xin of China returns the ball during the men's singles quarterfinal match against Zhao Zihao of China at the 2020 ITTF World Tour Platinum German Open in Magdeburg, Germany, on Feb. 1, 2020. (Photo by Zhang Ping/Xinhua)

Xu Xin of China returns the ball during the men's singles quarterfinal match against Zhao Zihao of China at the 2020 ITTF World Tour Platinum German Open in Magdeburg, Germany, on Feb. 1, 2020. (Photo by Zhang Ping/Xinhua)