Great Britain claimed their first 4 x 100 m relay Gold at the World Championships tonight.

They beat the USAto win in a British record time of 37.47 seconds.

Usain looked in agony as the pulled muscle in his leg quickly etched through his race (and his face) a few metres from the finish line.

The 30-year-old, who took 100m bronze in his final solo race, ends his career with 11 world and eight Olympic golds.