The Ger Lyons-trained Himalayan Heights (9/4) led the entire way under Colin Keane in the mile-and-a-half maiden.
Abdulla Alkhalifa's Camelot colt, who finished second in his prior two appearances, led the way going into the straight and maintained good form to defeat useful hurdler Man O Work by a length and a half.
Assistant trainer Shane Lyons said: "That is lovely for new connections into the yard, who had horses with Gerard Butler some years ago. It was beautiful summer ground at Leopardstown on the last day but we didn't think he let himself down on the ground, behind Highbury. He is a big horse and Colin said he didn't enjoy that ground either - he wants just a nice ease. Colin has no rules and when the horse became a bit 'chewy', there was no point fighting him as he has had three runs, and he did the right thing by letting him go to the front. He is an autumn horse and is definitely a next-year horse so we'll enjoy making a plan with him."