Treble gold for Bolt as bungling USA DQ'd

For success I consider three factors are necessary:

firstly, an awareness of my own strengths and weaknesses;

secondly, an accurate understanding of my opponent's strengths and weaknesses;

thirdly, a higher aim than momentary satisfaction.

I see this aim as being scientific and artistic achievements, which place the game of chess on a par with other arts.

- Alexander Alekhine

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  Jamaica's Usain Bolt (R) races away with the baton from USA's Mike Rodgers …

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  The Jamaican relay team (L-R) Nesta Carter, Asafa Powell, Nickel Ashmeade and Usain …

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  USA's Trayvon Bromell (R) hands the baton to USA's Justin Gatlin (L) in the …

Usain Bolt capped a memorable world championships by winning a third gold on Saturday as anchor of Jamaica's 4x100m relay team, while the United States were disqualified to hand China a shock silver.

Bolt ran a blistering final leg at a packed Bird's Nest stadium, hurtling through the line in 37.36 seconds after team-mates Nesta Carter, Asafa Powell and Nickel Ashmeade had successfully got the baton around.

Fraser-Pryce leads Jamaican women to relay gold

BEIJING (Reuters) - Jamaica, anchored by Shelly-Ann Fraser-Pryce, clocked the second fastest time in history to retain their 4x100 meters relay title at the world championships on Saturday.

Veronica Campbell-Brown, Natasha Morrison and 200 meters silver medalist Elaine Thompson ensured Fraser-Pryce had a good lead when she took the baton and the 100 meters champion stormed across the line in 41.07 seconds.

The United States finished second in 41.68 with the early pace of the Jamaicans giving anchor Allyson Felix, the 400 meters champion in Beijing, no chance of catching Fraser-Pryce.