Rio 2016: Brilliant Wayde Van Niekerk smashes Michael Johnson's 400m world record - Rio Olympics 2016 (Australian Broadcasting Corporation)
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Nirmala Sheoran Profile: Nirmala Sheoran Biography, Stats, Athlete, Women 400 metres
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Rio 2016: Brilliant Wayde Van Niekerk smashes Michael Johnson's 400m world record - Rio Olympics 2016 (Australian Broadcasting Corporation)
Rio Olympics 2016: drama in 400m and David Rudisha wins 800m – day 10 as it happened | Sport | The Guardian
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Olympic Track and Field 2016: Women's 400M Medal Winners, Times and Results | Bleacher Report | Latest News, Videos and Highlights
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All Australia's medals won at the Rio 2016 Olympic Games | Daily Telegraph
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Rio Olympics 2016: Wayde van Niekerk breaks world record to win Olympic gold - BBC Sport
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Rio 2016: Brilliant Wayde Van Niekerk smashes Michael Johnson's 400m world record - Rio Olympics 2016 (Australian Broadcasting Corporation)
Rio Olympics 2016: Wayde van Niekerk breaks world record to win Olympic gold - BBC Sport
Swimming at the 2016 Summer Olympics – Women's 400 metre individual medley - Wikipedia
