However , the 25-year-old fell foul of the current false start rules , which state that any athlete who jumps the gun is immediately disqualified . Defending champion Usain Bolt disqualified from the world 100m final . The Jamaican sprinter was stripped of his gold medal after testing positive for a banned substance at an athletics meet in July. Compatriot Yohan Blake wins gold with silver going to American Walter Dix . Ethiopian legend Kenenisa Bekele misses men 's 10,000m final through injury .
Defending champion Usain Bolt disqualified from the world 100m final . The Jamaican sprinter was stripped of his gold medal after testing positive for a banned substance at an athletics meet in July. Compatriot Yohan Blake wins gold with silver going to American Walter Dix . Ethiopian legend Kenenisa Bekele misses men 's 10,000m final through injury .