
Niwa Koki of Japan competes during the men's singles match against Dimitrij Ovtcharov of Germany at the 2017 World Table Tennis Championships in Dusseldorf, Germany, June 4, 2017. (Xinhua/Shan Yuqi)

Niwa Koki of Japan competes during the men's singles match against Dimitrij Ovtcharov of Germany at the 2017 World Table Tennis Championships in Dusseldorf, Germany, June 4, 2017. (Xinhua/Shan Yuqi)