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Shaunae Miller-Uibo celebrates after she won the women's 300 metres event in a new world record, at the Golden Spike athletics IAAF World Challenge in Ostrava, Czech Republic, Thursday. (Jaroslav Ozana/CTK via AP)

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UPDATED: Miller-Uibo smashes 300m world record

Olympic 400 metre champion Shaunae Miller-Uibo left everybody watching in awe as she raced to a world record-breaking performance in the rarely contested women’s 300 metres at the 58th edition of the Golden Spike Ostrava.

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