Midnight Soprano completed a five-timer with her biggest success to date in the Seamus & Rosemary McGrath Memorial Saval Beg Stakes at Leopardstown.
The wet conditions may have halved the field to four for this Listed contest, but the daughter of Celtic Swing proved up to the test as she took the honours in game fashion.
British raider, the Mark Johnston-trained Eternal Heart, made the running but was a sitting duck in the straight as his three rivals pounced.
And it was Midnight Soprano (5-1), who swept into the lead and held off the late challenge of Saddler's Rock by half-a-length to strike for trainer Paul Deegan and jockey Chris Hayes.
The 5-6 favourite Unaccompanied was third with Eternal Heart last of the quartet.
Deegan said: "She's got a bit of class though, and she's really improving.
"The plan after the Curragh was to go for the Noblesse but this looked like it might cut up so we came here. We might change again and go on for the Martin Molony (Limerick, June 22)."