Jamaica’s Usain Bolt wins his heat in the 100 meter semifinals during the athletics competitions of the 2016 Summer Olympics at the Olympic stadium in Rio de Janeiro, Brazil, Sunday, Aug. 14, 2016. (AP Photo/Morry Gash)
Jamaica’s Usain Bolt, centre, Canada’s Andre De Grasse, right, and Britain’s Chijindu Ujah compete in a men’s 100-meter semifinal during the athletics competitions of the 2016 Summer Olympics at the Olympic stadium in Rio de Janeiro, Brazil, Sunday, Aug. 14, 2016. (AP Photo/David J. Phillip)