Beijing: Usain Bolt capped a memorable world championships by winning a third gold medal on Saturday as anchor of the Jamaican 4x100m relay team, while fierce rivals the United States were disqualified.

Bolt ran the final leg of the relay at a packed Bird’s Nest stadium, hurtling through the line in 37.36 seconds after teammates Nesta Carter, Asafa Powell and Nickel Ashmeade had successfully got the baton around.

The victory gave Bolt his 11th world gold medal — the only one missing from his collection being the 100m in the 2011 Daegu worlds when he was disqualified after a false start.

The US quartet of 100m bronze and silver medallists Trayvon Bromell and Justin Gatlin, and fellow finalists Tyson Gay and Mike Rodgers were initially awarded silver but later disqualified.

China, headed by individual 100m finalist Bingtian Su, delighted the home crowd when they were upgraded to a shock silver in 38.01sec while Canada were awarded bronze (38.13).