Dalilah Muhammad breaks 400m hurdles world record at US National Championships - BBC Sport
Olympic champion Dalilah Muhammad breaks the 400m hurdles world record at the US National Championships in Iowa.
The 29-year-old took more than a tenth of a second off a record that had stood for 16 years, clocking 52.20 seconds to beat Russian Yuliya Pechonkina's previous mark of 52.34
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