Ethiopia's Tirunesh Dibaba bided her time before letting loose on the final lap with an awesome display of speed to complete a hat-trick of world championship 10,000 meters titles in Moscow.
Kenya, facing scrutiny from world anti-doping officials and criticism that it is not doing enough to tackle the problem, has banned seven more athletes for doping offences, raising the total number of Kenyan drug cases in the last three years to 40.