Usain Bolt swept away any remaining clouds surrounding his 100m disqualificati on when he anchored Jamaica to a world record time of 37.04 seconds to retain the world 4x100m relay title on Sunday.
The double Olympic sprint champion and world record holder teamed up with Nesta Carter, Michael Frater and Yohan Blake to better the mark of 37.10 seconds the Jamaicans ran to win gold at the Beijing Olympics in 2008.Bolt, who ran the third leg in Beijing, took over the anchor role in the absence of injured former world record holder Asafa Powell and received the baton from Blake, his successor as 100m world champion, with a commanding lead.
The 24-year-old hurtled down the straight well clear of the field with his eyes fixed on the clock before crossing the line and tossing the baton into the air in delight having helped set the only world record at the 13th world championships.
France finished second a world championship record 1.16 seconds behind the dominant Jamaicans to win the silver medal in 38.20 with Saint Kitts and Nevis claiming bronze in 38.49. The Americans, who had never previously been beaten when they had reached a world championship 4x100m final, failed to finish after their third-leg runner Darvis Patton clipped a British athlete and fell over before attempting to pass the baton to Walter Dix. The British quartet also failed to finish.
Jeter leads US team
US won the women's 4x100m relay, Carmelita Jeter bringing the anchor leg home in a time of 41.56. Jamaica took second place in 41.70 and Ukraine claimed the bronze in 42.51.
Russian Maria Savinova overhauled Caster Semenya on the home straight to win the women's 800m gold and end the South African's controversial reign as world champion. Savinova came through the field behind Semenya on the final bend and surged passed her rival to win in a world-leading time of 1 min 55.87 secs.
Blow for Heidler
Russian Tatyana Lysenko upset world record holder Betty Heidler to win the hammer throw. Returning from a doping ban, she threw 77.13m.
Taylor takes gold
Christian Taylor of the US shocked defending champion Phillips Idowu to win the triple jump, clearing a best of 17.96m.