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Jamaica's Nickel Ashmeade, Asafa Powell, Usain Bolt and Nesta Carter celebrate after winning the men’s 4x100m relay final Image Credit: AP

Beijing: 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.

Double Olympic champion Shelly-Ann Fraser-Pryce later anchored Jamaica to their second successive world title in the women’s 4x100 metres, underlining the Caribbean island’s stature as the leading sprint power once again. Fraser-Pryce, who won the 100 metres individual title in Beijing, left Jasmine Todd in her wake as the Jamaican quartet overpowered Olympic champions the United States to clock a championship best 41.07 seconds. The Americans took silver in 41.68.

The Jamaicans led from the gun, Veronica Campbell-Brown producing a blistering start, which Natasha Morrison built on in the second leg and Fraser-Pryce added the final flourish to bring the baton home in style.

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.

The victory gave Bolt his 11th world gold medal - his only blemish being the 100m at 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 before being disqualified over a botched final handover which strayed beyond the passover limit.

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

There was a distinctly gladiatorial atmosphere in the Bird’s Nest as all teams entered the arena through a traditional Chinese facade, passing cheerleaders and flagbearers to be introduced to a raucous capacity crowd.

Racing in lane four, Carter’s opening leg for Jamaica saw him slip slightly down on Bromell. Powell ran his second leg in full chase of Gatlin, silver medallist to Bolt in both the 100 and 200m, in lane six.

Ashmeade took up the chase for Jamaica around the back bend, but Gay had his beating and it looked as if Bolt would not have a genuine chance of catching the Americans.

But there was a disaster as Gay’s handover to Rodgers misfired and went outside the baton-passing area, leading to the US team being disqualified.

Ashmeade had no such problem with his own baton pass to Bolt, and suddenly the towering Jamaican had a clear run at the line.

Straight into the lead with Rodgers searching in thin air for the baton behind him, Bolt opened up all cylinders to race through for victory at what could be his last world championships.

Not only has Bolt won 11 individual world or Olympic sprint titles from a possible 12 since he took track and field by storm at the 2008 Beijing Olympics, but the 29-year-old has also been a key part of the relay team.

Despite losing to the US team at this year’s World Relays, much to Bolt’s visible annoyance, the Jamaicans have won all world and Olympic sprint titles since the 2008 Beijing Games, and also set a world record of 36.84sec while winning gold at the London Games.