
Timo Boll (R) of Germany competes during the men's singles match against Ma Long of China at the 2017 World Table Tennis Championships in Dusseldorf, Germany, June 4, 2017. (Xinhua/Shan Yuqi)

Timo Boll (R) of Germany competes during the men's singles match against Ma Long of China at the 2017 World Table Tennis Championships in Dusseldorf, Germany, June 4, 2017. (Xinhua/Shan Yuqi)