Women's 400m Semi-Finals | World Athletics Championships London 2017
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Women's 400m Semi-Finals | World Athletics Championships Beijing 2015
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Women's 400m Final | World Athletics Championships Beijing 2015
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World Record in the Mixed 4x400m | World Athletics Championships 2019 | Doha Moments
Allyson Felix starred in the USA team that set a new world record in the mixed 4x400m relay final.