Jessica Harrington's Hotazhell outbattled Delacroix to claim the William Hill Futurity Trophy Stakes at Doncaster.
Harrington's colt was ridden by Shane Foley as an 11-1 shot in a field of eight for the Group One.
He always looked a threat and began to lock horns with the favourite Delacroix, trained by Aidan O'Brien, in the final furlong, putting his head down to claim victory on the line as the first two pulled clear of the rest.
Hotzahell shaded Delcroix by a nose, with four and three-quarter lengths back to Wimbledon Hawkeye in third.
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