Long Island Sound is a colt going places and made it three from three in the Irish Stallion Farms EBF Race at Killarney.
Despite never tackling turf in public before after two wins at Dundalk, Aidan O'Brien's $800,000 purchase was sent off the 8-11 favourite and was allowed an uncontested lead.
Elusive Heights loomed up but once Seamie Heffernan asked Long Island Sound, he found more and passed the post with a length in hand.
"I thought the track rode a little bit tight for him and it wasn't ideal making all. He's a Group horse," said Heffernan.
A son of War Front, the winner holds entries in the St James's Palace Stakes and Coral-Eclipse, among others.
O'Brien's Monarch was an unlucky loser in the Celtic Steps The Show At Killarney Racecourse (C & G) Maiden.
Donnacha O'Brien had to wait for a run for most of the straight and once it came, his mount's surge was in vain as St Gallen (14-1) held on by short head.
Lightening Stricks sprung a 33-1 surprise in the Ross Golf Course Membership From 250 Handicap (Div 1) under St Gallen's jockey Niall McCullagh, and Gary Halpin drove 3-1 favourite Elusive In Paris to his first turf victory in the second instalment.
The Mouse Doctor (8-1) made a successful turf debut in the Join Tote Rewards Today At thetote.com Handicap, getting first run on favourite Aspen Mountain before holding on by a rapidly-diminishing short head.
Erysimum (9-4) showed her Sligo demolition job at the beginning of the month was no fluke by making every yard in the Irish Stallion Farms EBF Median Auction Fillies Race.
Willie McCreery's charge had them all on the stretch early in the straight, with Billy Lee looking around for non-existent dangers, although Gilded Reflection did rally to get within a length and three-quarters at the line.
Le Vagabond had the steadier of 10 stone to contend with in the Follow Us On Facebook Handicap but Kieren Fallon rode a patient race and produced the Edward O'Grady 6-1 chance with a perfectly-timed challenge to register a two-length verdict.
On paper, Ebayya appeared to have a penalty kick in the www.killarneyraces.ie Race but she could only manage a one-paced third as Abraham (5-2) got the best of a tussle with Jocular.