Usain Bolt brought the curtain down on his Olympic career with a record-equalling ninth gold medal, anchoring Jamaica to relay glory in a perfectly scripted ‘triple-triple’ finale.

The 29-year-old superstar, widely seen as the greatest sprinter in history, stormed over the line in 37.27sec to trigger an eruption of adulation in the Olympic Stadium.

Japan’s quartet took a surprise silver in 37.60sec while Canada took bronze after the United States, who crossed in third, were later disqualified.

The victory saw Bolt complete a third consecutive clean sweep of the 100m, 200m and 4x100m titles — the so-called ‘triple-triple’ following his six gold medals in the 2008 and 2012 Games.

It leaves Bolt, who will retire in 2017, level with Carl Lewis and Paavo Nurmi on nine Olympic gold medals, a record for a track and field athlete.