Matsudaira Kenta of Japan competes during men's singles round of 16 against Vladimir Samsonov of Belarus at the 2013 World Table Tennis Championships in Paris, France on May 18, 2013. Matsudaira Kenta won 4-3.(Xinhua/Wang Lili)

Ma Long of China competes during men's singles round of 16 against Niwa Koki of Japan at the 2013 World Table Tennis Championships in Paris, France on May 18, 2013. Ma won 4-2. (Xinhua/Wang Lili)

Matsudaira Kenta of Japan competes during men's singles round of 16 against Vladimir Samsonov of Belarus at the 2013 World Table Tennis Championships in Paris, France on May 18, 2013. Matsudaira Kenta won 4-3.(Xinhua/Tao Xiyi)

Ma Long of China celebrates during men's singles round of 16 against Niwa Koki of Japan at the 2013 World Table Tennis Championships in Paris, France on May 18, 2013. Ma won 4-2. (Xinhua/Wang Lili)

Ma Long of China competes during men's singles round of 16 against Niwa Koki of Japan at the 2013 World Table Tennis Championships in Paris, France on May 18, 2013. Ma won 4-2. (Xinhua/Wang Lili)

Ma Long of China competes during men's singles round of 16 against Niwa Koki of Japan at the 2013 World Table Tennis Championships in Paris, France on May 18, 2013. Ma won 4-2. (Xinhua/Wang Lili)

Ma Long of China celebrates during men's singles round of 16 against Niwa Koki of Japan at the 2013 World Table Tennis Championships in Paris, France on May 18, 2013. Ma won 4-2. (Xinhua/Tao Xiyi)

Ma Long of China competes during men's singles round of 16 against Niwa Koki of Japan at the 2013 World Table Tennis Championships in Paris, France on May 18, 2013. Ma won 4-2. (Xinhua/Wang Lili)

Vladimir Samsonov of Belarus competes during men's singles round of 16 against Matsudaira Kenta of Japan at the 2013 World Table Tennis Championships in Paris, France on May 18, 2013. Vladimir Samsonov lost 3-4. (Xinhua/Tao Xiyi)

Matsudaira Kenta of Japan competes during men's singles round of 16 against Vladimir Samsonov of Belarus at the 2013 World Table Tennis Championships in Paris, France on May 18, 2013. Matsudaira Kenta won 4-3.(Xinhua/Wang Lili)

Vladimir Samsonov of Belarus competes during men's singles round of 16 against Matsudaira Kenta of Japan at the 2013 World Table Tennis Championships in Paris, France on May 18, 2013. Vladimir Samsonov lost 3-4. (Xinhua/Wang Lili)

Vladimir Samsonov of Belarus reacts during men's singles round of 16 against Matsudaira Kenta of Japan at the 2013 World Table Tennis Championships in Paris, France on May 18, 2013. Vladimir Samsonov lost 3-4. (Xinhua/Wang Lili)