BBC Sport - Rio Olympics 2016: Wayde van Niekerk wins 400m gold and smashes Michael Johnson record

Rio Most-Watched No 9: Van Niekerk beats 400m world record

Wayde van Niekerk of South Africa runs 43.03 seconds in the men's 400m final to eclipse Michael Johnson's 17-year-old world record and win gold at Rio 2016.

Watch full coverage of the event here.

Available to UK users only.

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