2017 — Usain Bolt ends his stellar career in excruciating pain. The Jamaican great crumples to the track with a left-leg injury while chasing a final gold medal for the Jamaican 4x100-meter relay team at the world championships in London. Having to make up lots of ground on the anchor leg, Bolt suddenly screams and stumbles as he comes down with the first injury he has experienced at a major competition. Britain goes on to beat the United States in a tight finish. Tori Bowie is the unlikely first double gold medalist at the championships, anchoring the U.S. team to the 4x100-meter relay title ahead of Britain and Jamaica. At the same time, Allyson Felix, running the second leg on the winning team, earns a record 15th medal at the world championships in a career going back to 2005.
In this Aug. 12, 2017, file photo, Jamaica's Usain Bolt lies on the track after he injured himself in the 4x100 meter relay final at the World Athletics Championships in London. (AP Photo/Tim Ireland, File)