Running on home soil nearly two months before the London Olympics, Jessica Ennis thought she had produced a career best in the 100m hurdles - until organisers discovered a major blunder.
Only nine hurdles had been set out instead of the regulation 10 at the Great City Games in Manchester, northern England on Sunday.
Ennis described it as a "massive, massive mess-up."
The Briton had clocked 12.75 seconds into a headwind to beat Olympic champion Dawn Harper and world silver medallist Danielle Carruthers.
In a statement organisers said: "We would like to apologise for this unacceptable incident."
They blamed UK Athletics, who are employed "to manage this vital element of the event on our behalf, and we will of course be investigating this unfortunate occurrence with them."
Get over it!
Get over it!
“If you trust in yourself, and believe in your dreams, and follow your star. . . you'll still get beaten by people who spent their time working hard and learning things and weren't so lazy.”