Flight Risk sprang a massive 50-1 surprise in the Big Bad Bob Gladness Stakes as trainer Jim Bolger and jockey Kevin Manning landed a stunning 840.5-1 treble.
The race-fit four-year-old may have been unconsidered in the betting, but he came through with a telling run near the far rail to challenge for the lead inside the final quarter of a mile.
He galloped on resolutely to score comfortably by a length and a quarter from another outsider, 33-1 shot Piri Wango.
Bolger said: "Everything fell right and he's on his way.
"He got bogged down in Cork and the better ground helped.
"I'd like to come back for something like this on Derby weekend."
Bolger and Manning were completing a double on the card after the victory of the newcomer Mimicking, who led home a one-two for the yard in the Irish Stallion Farms EBF Maiden.
The 2-1 favourite strode clear to beat her always-prominent stablemate Ard San Aer by a length and three-quarters.
Bolger said: "She could go for the Marble Hill (at the Curragh next month) and maybe (Royal) Ascot.
"The second is speedy and hopefully he has a future as well."
Better was to come for Manning and Bolger as Parish Hall (9-2) travelled well throughout on the way to landing the Alleged Stakes.
The winner's stable companion Loch Garman, having his first run since finishing unplaced in the French Derby in June 2013, shaped most encouragingly for second place, ahead of Waltzing Matilda in third.
Bolger said of the winner: "The Mooresbridge (back at the Curragh on 4 May) is a possibility.
"Loch Garman is on his way back.
"He got badly carved up in the French Derby the year before last, and it took a while for the wounds to heal."
The former Eve Johnson Houghton-trained Penny Pepper (5-1) opened her account on her debut for Kevin Prendergast in the Irish Stallion Farms EBF Fillies Maiden.
Prendergast said: "Hopefully she can get some black type. She travelled nicely and was a little bit fresh."
Her jockey Chris Hayes completed a double on Papa's Way (9-2) in the Clongowes Wood College Bicentenary Handicap.
"Chris had him rolling down the hill and got them on the stretch. He's riding out of his skin at the moment," said trainer Paul Deegan.
In Salutem (11-1) came through strongly inside the final furlong to seal victory in the Cunninghams Of Kildare Handicap for trainer Ken Condon and jockey Shane Foley.
Condon said: "With a penalty for that he'll get into all the good sprint handicaps like the Paddy Power and the Rockingham."
Aidan O'Brien took the concluding Irish Stallion Farms EBF Maiden with the yard's apparent second string, the debutant Sandro Botticelli (11-1), ridden by Seamie Heffernan.
