Gold medal and world champion Steven Gardiner, third from right, and, from left, Kirani James, of Grenada, Machel Cedenio, of Trinidad And Tobago, Fred Kerley, of the United States, Demish Gaye, of Jamaica, and Akeem Bloomfield, of Jamaica, compete in the men's 400 metres final at the World Athletics Championships in Doha, Qatar, Friday. (AP Photo/Martin Meissner)