Rio 2016 - Van Niekerk wins the 400m final and breaks the world record
South Africa's Wayde van Niekerk stops the clock in 43.03 and breaks Michael Johnson's 17-year-old record.
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Rio 2016 - Van Niekerk wins the 400m final and breaks the world record
South Africa's Wayde van Niekerk stops the clock in 43.03 and breaks Michael Johnson's 17-year-old record.
