Chen Ding of China celebrates after Men's 20KM Race Walk in Day 2 of the 14th IAAF World Athletics Championships Moscow 2013 at in Moscow, Russia, Aug. 11, 2013. Chen Ding won the silver with 1 hour 21 minutes 9 seconds. (Xinhua/Li Ming)

 Cai Zelin (1st L, front), Wang Zhen (2nd L, front) and Chen Ding (1st R, front) of China compete during the Men's 20KM Race Walk in Day 2 of the 14th IAAF World Athletics Championships Moscow 2013 at in Moscow, Russia, Aug. 11, 2013. (Xinhua/Jia Yuchen)(xzj)

Chen Ding of China celebrates after Men's 20KM Race Walk in Day 2 of the 14th IAAF World Athletics Championships Moscow 2013 at in Moscow, Russia, Aug. 11, 2013. Chen Ding won the silver with 1 hour 21 minutes 9 seconds. (Xinhua/Li Ming)

Chen Ding of China celebrates after Men's 20KM Race Walk in Day 2 of the 14th IAAF World Athletics Championships Moscow 2013 at in Moscow, Russia, Aug. 11, 2013. Chen Ding won the silver with 1 hour 21 minutes 9 seconds. (Xinhua/Li Ming)

Chen Ding of China celebrates after Men's 20KM Race Walk in Day 2 of the 14th IAAF World Athletics Championships Moscow 2013 at in Moscow, Russia, Aug. 11, 2013. Chen Ding won the silver with 1 hour 21 minutes 9 seconds. (Xinhua/Li Ming)

Wang Zhen (2nd L, front) and Chen Ding (1st L, front) of China compete during the Men's 20KM Race Walk in Day 2 of the 14th IAAF World Athletics Championships Moscow 2013 in Moscow, Russia, Aug. 11, 2013. (Xinhua/Dai Tianfang)