Usain Bolt of Jamaica sprints to victory and a new world record in the men's 4x100 meter relay at the 2011 IAAF World Athletics Championships in Daegu, South Korea.
Mark Dadswell/Getty Images
American sprinter Justin Gatlin celebrates winning the 100m men's race at the IAAF Golden Gala at Stadio Olimpico in Rome Thursday. He defeated world record-holder Usain Bolt in the event.
Paolo Bruno/Getty Images