Yohan Blake of Jamaica celebrates after men's 200m final, at London 2012 Olympic Games, London, Britain, Aug. 9, 2012. Jamaican athletes Usain Bolt, Yohan Blake and Warren Weir won gold, silver and bronze medals in this event. (Xinhua/Li Ga)

Usain Bolt of Jamaica celebrates after men's 200m final, at London 2012 Olympic Games, London, Britain, Aug. 9, 2012. Usain Bolt won gold medal with 19.32. (Xinhua/Li Ga)

Usain Bolt of Jamaica celebrates after men's 200m final, at London 2012 Olympic Games, London, Britain, Aug. 9, 2012. Usain Bolt won gold medal with 19.32. (Xinhua/Gong Lei)

Yohan Blake of Jamaica celebrates after men's 200m final, at London 2012 Olympic Games, London, Britain, Aug. 9, 2012. Jamaican athletes Usain Bolt, Yohan Blake and Warren Weir won gold, silver and bronze medals in this event. (Xinhua/Yang Zongyou)

Usain Bolt of Jamaica celebrates after men's 200m final, at London 2012 Olympic Games, London, Britain, Aug. 9, 2012. Usain Bolt won gold medal with 19.32. (Xinhua/Li Ga)

Usain Bolt (R) of Jamaica celebrates after men's 200m final, at London 2012 Olympic Games, London, Britain, Aug. 9, 2012. Usain Bolt won gold medal with 19.32. (Xinhua/Gong Lei)