Leovanni stormed clear in the final furlong to land the Queen Mary Stakes at Royal Ascot.
The Karl Burke-trained filly raced prominently in the group on the far side before James Doyle got to work and sent her to the front.
Winner of her only previous start, the Wathnan Racing-owned youngster had far too much speed for the rest and pulled clear down the centre of the track to land the honours by a ready length and three-quarters at 22-1.
Mighty Eriu stayed on to take second for Gavin Cromwell, with the Adrian Nicholls-trained Maw Law taking third.
