Usain Bolt led Jamaica to the men's 4x100m relay gold medal at the Rio Olympics on Friday.
Jamaica clocked 37.27 seconds, beating second-placed Japan by 0.33. The United States came third in 37.62 but was disqualified.
Bolt has won an Olympic sweep of 100m, 200m and 4x100m for the third straight time.
Surprise world runner-up China was fourth.