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Rio 2016: United States' Kerron Clement wins gold in men's 400m hurdles - SBNation.com
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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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Rio 2016: Brilliant Wayde Van Niekerk smashes Michael Johnson's 400m world record - Rio Olympics 2016 (Australian Broadcasting Corporation)
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Rio 2016: Brilliant Wayde Van Niekerk smashes Michael Johnson's 400m world record - Rio Olympics 2016 (Australian Broadcasting Corporation)
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