Usain Bolt added relay gold to his list of triumphs at the 2015 World Athletics Championships in Beijing as Jamaica eased to victory in the 4x100m final.
The six-time Olympic champion, who emphatically silenced his doubters by beating controversial rival Justin Gatlin in both the 100m and 200m races earlier this week, was barely tested on the final straight and crossed the line in 37.37secs after Nickel Ashmeade, Asafa Powell and Nesta Carter had laid the foundations for success.
A US team made up of Gatlin, Tyson Gay, Trayvon Bromell and Mike Rodgers initially took silver but were later disqualified after their final baton exchange was adjudged to have occurred outside of the designated zone.
That decision led to hosts China being promoted to second and Canada snatching bronze, but Great Britain disappointingly dropped out of medal contention when their third handover between James Ellington and Chijindu Ujah was botched.
Jamaica have now won the sprint relay at six straight major global championships, including the last two Olympics, but for the first 200m it did not like they were going to extend their dominance.
While Nesta Carter and former world record holder Asafa Powell did not get Jamaica off to the best of starts, the Americans were flying with Trayvon Bromell and Gatlin tearing up the track.
Nickel Ashmeade, who won bronze behind Bolt and Gatlin in the 100 meters, gained ground on Gay coming round the final bend but the Americans were looking in good shape to repeat their victory over the Jamaicans at this year’s world relays.
On the final handover, however, Gay was initially unable to get the baton to Rodgers and by the time he did, the anchorman was outside the exchange zone.
Bolt already had the Jamaican baton safely in his hand and sprinted to victory down a track on which he has now won six major global championship gold medals.
In the women’s final, Jamaica asserted their dominance once more as Veronica Campbell-Brown, Natasha Morrison, Elaine Thompson and Shelly-Ann Fraser-Pryce recorded the second-fastest time in history at 41.07secs.
Silver went to the US, while Trinidad and Tobago finished with bronze. Great Britain just missed the cut in fourth although set a new national record of 42.10secs.
Jamaica led from the gun, Veronica Campbell-Brown producing a blistering start, which Natasha Morrison built on in the second leg passing to Elaine Thompson with Fraser-Pryce adding the final flourish to bring the baton home in style.