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

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