Tobi Amusan broke the 100m hurdles world record with a stunning semi-final time of 12.12 seconds - before taking gold at the World Athletics Championships in Eugene, Oregon.
The Nigerian, 25, ran even faster in the final - but her 12.06 was ruled ineligible by an illegal tailwind.
Tobi Amusan has done it again!!!
Another World Record!!!
12.05s
Nigeria’s first ever World Title!! pic.twitter.com/gjIQIWnqDi
The previous record of 12.20 was set in 2016 by American Kendra Harrison.
Jamaica's Britany Anderson took silver and Puerto Rico's Olympic champion Jasmine Camacho-Quinn got bronze.
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Amusan, who had already run a new African record of 12.40 seconds in Saturday's heats, said: "I believe in my abilities but I was not expecting a world record at these championships.
"I wanted to get out and go. I did what I had to do."
Great Britain's Cindy Sember finished fourth in the semi-final won by Amusan, but qualified for the final with a British record of 12.50, beating sister Tiffany Porter's 2014 mark by one hundredth of a second.
It was one of four national records, excluding Amusan's, run in the semi-finals, with another seven athletes equalling or breaking their personal bests.
"That was a crazy race. I actually thought I was running slow. Tobi was amazing, I can't deny," said Sember, who went on to finish fifth in the final.
BBC