Lin Gaoyuan of China returns the ball during the men's singles quarterfinal match against Mizutani Jun of Japan 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)

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

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

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