Tyson Gay of the U.S. looks at the scoreboard beside Asafa Powell of Jamaica (L) after his men's 100m semi-final of the athletics competition at the National Stadium during the Beijing 2008 Olympic Games, August 16, 2008.  [Agencies]

BEIJING - World champion Tyson Gay failed to qualify for the Olympic men's 100 metres final after finishing fifth in his semi-final on Saturday.

The American clocked a time of 10.05 seconds in the second semi-final won by Jamaican Asafa Powell.

Jamaican Usain Bolt, the world record holder, was the fastest qualifier.