Jamaica, led by the world\'s fastest man Usain Bolt, broke the world record in the men\'s 4x100m relay and retained the world title in 37.04 seconds on Sunday night at the Daegu world championships. The Jamaican team, featuring Nesta Carter, Michael Frater, Yohan Blake and Usain Bolt, secured their lead in the first three legs thanks to 21-year-old Blake, the newly-crowned men\'s 100m world champion. Blake took gold in the men\'s 100m final last Sunday with 9.92 seconds after Bolt was disqualified for a false start. With relay baton on Bolt\'s hand, he sprinted ahead in full charge, and crossed the finish line to a new world recod. The previous world record was 37.10, which was also set by Jamaica at the 2008 Beijing Olympics. France finished second in 38.20. St. Kitts and Nevis took bronze in 38.49 The United States and Britain both failed to finish the race owing to failures in the baton relay between the third and fourth leg. The men\'s 4x100m relay is the last event at the 9-day Daegu worlds, which drew to an end on Sunday night.