South Africa's Van Niekerk wins gold with 400m world record ...
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Michael Johnson Sevilla 1999: Men's 400m world record - YouTube
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/cdn.vox-cdn.com/uploads/chorus_image/image/50388485/Screen_Shot_2016-08-14_at_9.02.30_PM.0.0.png "Olympics 2016 results: Wayde van Niekerk sets world record from ...")
Olympics 2016 results: Wayde van Niekerk sets world record from ...
Record du monde du 400 mètres — Wikipédia
:max_bytes(150000):strip_icc()/michaeljohnsonWR400-ShaunBotterill-56a6cc653df78cf77290225c.jpg "Men's 400-Meter World Records")
Men's 400-Meter World Records
American college student Michael Norman breaks indoor 400m world ...
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Wayde van Niekerk breaks world 400m record for Olympic gold - AW
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Women's 400-Meter World Records
Olympic champion Muhammad smashes women's 400m hurdles world ...
Wayde van Niekerk Runs 43.03, Breaks 400m World Record!
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13-Year-Old 47s 400m WORLD RECORD! - YouTube
Women set new 4 x 400m Record and Nikki seventh - Scottish Athletics
Muhammad sets world record in 400m hurdles
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