Usain Bolt wins the 100 meters at the world championships in a time of 9.58 seconds . Bolt reclaims the world title after being disqualified from the 2011 final due to a false start . Perhaps mindful of what happened in South Korea , Bolt 's start was cautious and Gatlin led him early . Jamaican Usain Bolt took the silver and South Korea 's Justin Gatlin claimed bronze .
Usain Bolt wins the 100 meters at the world championships in a time of 9.58 seconds . Bolt reclaims the world title after being disqualified from the 2011 final due to a false start . Jamaican Usain Bolt took the silver and South Korea 's Justin Gatlin claimed bronze .