La Collina sprang a surprise in the Group One Keeneland Phoenix Stakes at the Curragh.
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Kevin Prendergast's charge was sent-off an unconsidered 33-1 chance and had only one rival behind her at the furlong pole.
However Declan McDonogh conjured a rare change of pace from his partner to cut down 7-4 favourite Power and win, going away, by a neck.
Tough As Nails (12-1) was third.
Frederic Engels was the unlucky horse in the race having been badly hampered by Parish Hall when looking to make his challenge.
McDonogh said: "This is a big lift for everybody. It's been a very slow start for the stable.
"They went hard and there was a bit of traffic at half-way.
"I just got out and was lucky with the clear run I got. I never got stopped. I just had to switch a couple of times.
"Johnny (Murtagh on Frederick Engels) went for a run on the fence and I was following him for most of the way and it (a gap) was closing from where I was looking at.
"I thought I wasn't going there, so I switched away from them and I'm lucky I did.
"I got outpaced early and let her find her feet.
"She's a very good two-year-old and that was a true test. "She's all heart."
Prendergast added: "I delighted with that - she was working well at home. "I though both this race and the Debutante were tough races, but the Ascot form didn't work out well so I picked this race for her instead.
"Also Maybe was giving us 3lb the last day at Leopardstown, so I wasn't keen to take her on again off level weights.
"She will go for the Moyglare Stud Stakes next (Curragh, August 28)."
Sky Bet introduced the winner to their QIPCO 1000 Guineas betting at 8-1 with Coral even more impressed. The Barking-based form go 7s.