Kim Hyok Bong/Kim Jong(Front) of the Democratic People's Republic of Korea () compete against 's Yoshimura Maharu/Ishikawa Kasumi during Mixed Doubles Semifinal at the 53rd Table Tennis World Championships in Suzhou, city of east China's Jiangsu Province, on April 30, 2015. Japan's Yoshimura Maharu/Ishikawa Kasumi won 4-2. (Xinhua/Li Xiang)

Japan's Yoshimura Maharu/Ishikawa Kasumi(L) compete against Kim Hyok Bong/Kim Jong of the Democratic People's Republic of Korea (DPRK) during Mixed Doubles Semifinal at the 53rd Table Tennis World Championships in Suzhou, city of east China's Jiangsu Province, on April 30, 2015. Japan's Yoshimura Maharu/Ishikawa Kasumi won 4-2. (Xinhua/Wang Yuguo)

Kim Hyok Bong/Kim Jong(L) of the Democratic People's Republic of Korea (DPRK) celebrate the score during Mixed Doubles Semifinal against Japan's Yoshimura Maharu/Ishikawa Kasumi at the 53rd Table Tennis World Championships in Suzhou, city of east China's Jiangsu Province, on April 30, 2015. Japan's Yoshimura Maharu/Ishikawa Kasumi won 4-2. (Xinhua/Li Xiang)

Japan's Yoshimura Maharu(Front)/Ishikawa Kasumi compete against Kim Hyok Bong/Kim Jong of the Democratic People's Republic of Korea (DPRK) during Mixed Doubles Semifinal at the 53rd Table Tennis World Championships in Suzhou, city of east China's Jiangsu Province, on April 30, 2015. Japan's Yoshimura Maharu/Ishikawa Kasumi won 4-2. (Xinhua/Wang Yuguo)

Kim Hyok Bong/Kim Jong(R) of the Democratic People's Republic of Korea (DPRK) accept advices during Mixed Doubles Semifinal against Japan's Yoshimura Maharu/Ishikawa Kasumi at the 53rd Table Tennis World Championships in Suzhou, city of east China's Jiangsu Province, on April 30, 2015. Japan's Yoshimura Maharu/Ishikawa Kasumi won 4-2. (Xinhua/Li Xiang)

Japan's Yoshimura Maharu/Ishikawa Kasumi(L) compete against Kim Hyok Bong/Kim Jong of the Democratic People's Republic of Korea (DPRK) during Mixed Doubles Semifinal at the 53rd Table Tennis World Championships in Suzhou, city of east China's Jiangsu Province, on April 30, 2015. Japan's Yoshimura Maharu/Ishikawa Kasumi won 4-2. (Xinhua/Li Xiang)

Japan's Yoshimura Maharu/Ishikawa Kasumi(R) celebrate the victory after Mixed Doubles Semifinal against Kim Hyok Bong/Kim Jong of the Democratic People's Republic of Korea (DPRK) at the 53rd Table Tennis World Championships in Suzhou, city of east China's Jiangsu Province, on April 30, 2015. Japan's Yoshimura Maharu/Ishikawa Kasumi won 4-2. (Xinhua/Li Xiang)

Japan's Yoshimura Maharu/Ishikawa Kasumi(R) celebrate the victory after Mixed Doubles Semifinal against Kim Hyok Bong/Kim Jong of the Democratic People's Republic of Korea (DPRK) at the 53rd Table Tennis World Championships in Suzhou, city of east China's Jiangsu Province, on April 30, 2015. Japan's Yoshimura Maharu/Ishikawa Kasumi won 4-2. (Xinhua/Li Xiang)

Kim Hyok Bong/Kim Jong(L) of the Democratic People's Republic of Korea (DPRK) celebrate the score during Mixed Doubles Semifinal against Japan's Yoshimura Maharu/Ishikawa Kasumi at the 53rd Table Tennis World Championships in Suzhou, city of east China's Jiangsu Province, on April 30, 2015. Japan's Yoshimura Maharu/Ishikawa Kasumi won 4-2. (Xinhua/Li Xiang)

Japan's Yoshimura Maharu/Ishikawa Kasumi(L) compete against Kim Hyok Bong/Kim Jong of the Democratic People's Republic of Korea (DPRK) during Mixed Doubles Semifinal at the 53rd Table Tennis World Championships in Suzhou, city of east China's Jiangsu Province, on April 30, 2015. Japan's Yoshimura Maharu/Ishikawa Kasumi won 4-2. (Xinhua/Li Xiang) 10

Japan's Yoshimura Maharu/Ishikawa Kasumi(L) compete against Kim Hyok Bong/Kim Jong of the Democratic People's Republic of Korea (DPRK) during Mixed Doubles Semifinal at the 53rd Table Tennis World Championships in Suzhou, city of east China's Jiangsu Province, on April 30, 2015. Japan's Yoshimura Maharu/Ishikawa Kasumi won 4-2. (Xinhua/Li Xiang) 11

Japan's Yoshimura Maharu/Ishikawa Kasumi(L) celebrate the victory after Mixed Doubles Semifinal against Kim Hyok Bong/Kim Jong of the Democratic People's Republic of Korea (DPRK) at the 53rd Table Tennis World Championships in Suzhou, city of east China's Jiangsu Province, on April 30, 2015. Japan's Yoshimura Maharu/Ishikawa Kasumi won 4-2. (Xinhua/Wang Yuguo) 12

Japan's Yoshimura Maharu/Ishikawa Kasumi(L) compete against Kim Hyok Bong/Kim Jong of the Democratic People's Republic of Korea (DPRK) during Mixed Doubles Semifinal at the 53rd Table Tennis World Championships in Suzhou, city of east China's Jiangsu Province, on April 30, 2015. Japan's Yoshimura Maharu/Ishikawa Kasumi won 4-2. (Xinhua/Li Xiang) 13

Japan's Yoshimura Maharu/Ishikawa Kasumi(L) celebrate the victory after Mixed Doubles Semifinal against Kim Hyok Bong/Kim Jong of the Democratic People's Republic of Korea (DPRK) at the 53rd Table Tennis World Championships in Suzhou, city of east China's Jiangsu Province, on April 30, 2015. Japan's Yoshimura Maharu/Ishikawa Kasumi won 4-2. (Xinhua/Wang Yuguo) 14