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The Jamaican simply laid waste to the best of the rest in the sprinting world to win his eighth track gold medal in what he has said will be his last individual race at the Olympics before his retirement next year.

The incomparable Usain Bolt once again proved utterly unbeatable on the Olympic track powering his way to a third straight 200 meters gold and remaining on course for an extraordinary triple-triple of sprint titles.

Bolt's time of 19.78 seconds was the slowest of his four straight world championship and three Olympic triumphs over 200 meters but it certainly did not dampen the celebrations.

His place in that pantheon is probably already assured but Bolt will return to the track for the 4x100m relay two days before his 30th birthday looking to complete the sweep of all three sprint titles at three successive Olympics.

Canadian Andre de Grasse, who also won bronze behind Bolt in the 100m, finished second in 20.02 to claim his second sprint medal of the Games and establish himself as the heir apparent to the Sprint King.

Christophe Lemaitre of France was ecstatic with his bronze medal after edging out a shattered Adam Gemili of Britain in a photo finish. Both were awarded the same time of 20.12.

Lemaitre, the first white man to run under 10 seconds, raised his hands above his head and fell back onto the track as the scoreboard confirmed he had taken the bronze.

Even the prospect of witnessing a once-in-a-century athlete he was not enough to fill the Rio Olympic Stadium but what the crowd lacked in numbers, they made up for in noise as they welcomed Bolt to the track like a rock star.

The great showman responded in kind by playing air guitar and swaying to the music while smiling and nodding straight into the TV camera.

Beaten only once in nine years in his favorite event, the Jamaican had said he thought the world record of 19.19 he set at the 2009 world championships in Berlin was within reach. It was not to be.

Head down and hands pumping away as he built up speed over the first 30 meters, Bolt rounded the bend with a clear lead but was unable charge to the line as fast as he wanted, even if he did finish three meters clear of De Grasse.