Usain Bolt is an athlete.
The 100 metres , or 100-metre dash , is a sprint race in track and field competitions . The 11th World Championships in Athletics , under the auspices of the International Association of Athletics Federations ( IAAF ) , were held at Nagai Stadium in Osaka , Japan from 24 August to 2 September 2007 . The men 's 100 metres at the 2015 World Championships in Athletics was held at the Beijing National Stadium on 22 and 23 August . Usain St Leo Bolt , OJ , CD ( [ ˈjuːseɪn ] born 21 August 1986 ) is a Jamaican sprinter . Bolt improved upon his first 100 m world record of 9.69 with 9.58 seconds in 2009 -- the biggest improvement since the start of electronic timing .