In the men’s 400m hurdles final at Barcelona 1992 Kevin Young became the first and only man ever to run the event in under 47 seconds, setting a new world record that has stood ever since.
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The current men's and women's world record is 45 and 51 seconds, respectively.
What the first by women under 52 seconds?
What the second under 47 seconds? What the first under 46 seconds?