A combo photo shows Usain Bolt of Jamaica (R) makes a false start as Nesta Carter of Jamaica stays in the blocks in the men's 100 metres final at the IAAF World Championships in Daegu August 28, 2011. Bolt false started and was disqualified from the world athletics championships 100 metres final on Sunday. [Photo/Agencies]

Usain Bolt of Jamaica reacts after being disqualified for a false start in the men's 100 metres final at the IAAF World Championships in Daegu August 28, 2011.  [Photo/Agencies]

DAEGU, South Korea - Jamaican Yohan Blake won the men's world 100 metres final on Sunday after defending champion and Olympic gold medallist Usain Bolt was dramatically disqualified for a false start.

World record holder Bolt ripped off his vest as soon as the second gun went off to indicate the false start and was led disconsolately from the track.

His 21-year-old training partner Blake made the most of Bolt's absence, storming home in 9.92 seconds to claim his first major title.

American Walter Dix pipped Kim Collins to silver in 10.08 seconds, dipping over the line to leave the 2003 champion from St Kitts and Nevis with a third world championship bronze medal in 10.09.  

The field for the final had already been weakened by the absence through injury of Bolt's most likely challengers, American former world champion Tyson Gay and former world record holder Asafa Powell.