Ria Antonia was awarded a dramatic renewal of the Breeders' Cup Juvenile Fillies following an enquiry.
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She's A Tiger and Gary Stevens passed the post first but Javier Castellano objected to the result, citing interference close to the wire and the 40/1 outsider was awarded the result.
The race was marred by a fatal fall for Secret Compass, her jockey Jonny Velazquez giving up his next ride, but at the head of affairs there was a titanic duel between the front-running She's A Tiger and the rank outsider Ria Antonia.
She's A Tiger broke smartly and was soon at the head of affairs from her wide draw and she turned into the straight with a commanding advantage.
However, the daughter of Tale Of The Cat began to tread water and drifted off a true line as she was challenged by Ria Antonia while Sweet Reason was making ground against the rail.
The latter was the first to weaken and She's A Tiger held on from Ria Antonia while Rosalind flew fast and late to only narrowly be beaten into third but the drama was only just beginning.
The stewards' opted to take a look at the interference and reversed the placings.
"I had gotten by Gary (Stevens) but when he came in to me, he bumped me off stride," Castellano said.
Trainer Jeremiah Englehart added: "I'm elated. I'm ecstatic. I don't even know what to say. This is unbelievable. There was no doubt in my mind after I watched the replay. I'm absolutely elated."
Jeff Bonde, trainer of She's A Tiger, said: "This is heartbreaking - heartbreaking. There is nothing else I can say. She is still a wonderful filly, but this just heartbreaking."