Tokyo Olympics: Highlights of the women's 400m semi-finals featuring Allyson Felix and Jodie Williams

Tokyo Olympics: Highlights of the women's 400m semi-finals featuring Allyson Felix and Jodie Williams

BBC Sport

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Watch highlights of the women's 400m semi-finals featuring Allyson Felix and Jodie Williams, who clocks a personal best of 49.97 seconds to progress to the final.

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