Usain Bolt completed his hat-trick of sprint titles at the World Athletics Championships in Berlin as he helped the all-conquering Jamaican side power to victory in the men’s 4x100m relay final. Bolt ran the third leg, handing off to individual bronze medallist Asafa Powell, as Olympic champions Jamaica took gold in a new championship record of 37.31 seconds. Jamaica had rested Bolt and Powell in the heats and were always red-hot favorites to win
