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Commentary from Mike Costello on the 4x100m relay final in Rio, as Usain Bolt claims an unprecedented 'triple triple' and his ninth Olympic gold.

"Dreams really do come true. Usain Bolt has said, from a small boy, he was inspired by the Olympic Games and on the biggest stage of all, he will leave this arena with nine Olympic gold medals," added former British sprinter Darren Campbell.

Bolt, 29, had won the 100m and 200m in Rio and is the only man to win all three sprint events at three Games.

He combined with Asafa Powell, Yohan Blake and Nickel Ashmeade to finish in 37.27 seconds.

Japan won a surprise silver and the USA were disqualified to hand Canada bronze and lift Britain up to fifth.

This clip is from 5 live Olympics on Saturday 20 August 2016.