Usain Bolt has won his third successive world 200 metres title in the year's fastest time of 19.66 seconds.
Fellow Jamaican Warren Weir improved on his Olympic bronze by taking silver in a personal best 19.79.
Curtis Mitchell won bronze for the United States in 20.04, just preventing another Jamaican podium sweep as he beat Nickel Ashmeade by a hundredth of a second.
In the men's marathon, Stephen Kiprotich of Uganda has backed up his Olympic gold by winning in a time of two hours nine minutes and 51 seconds.
