Reverberation came all the way from last to score for Blackwater trainer James Lambe in yesterday's Fairyhouse Social Media Handicap.
The winner, owned by Armagh's Richie Behan, was recording a first success on the turf as previous victories were on the all-weather.
Stamp Of Authority attempted to make all but Reverberation was delivered by Gavin Ryan in the final two furlongs.
Lambe said: "I thought he'd need the run and he'll improve loads. A lot of mine seem to be taking a run this year.
"A mile will probably suit him as he won going away. Mine had a nice bit of a break during the lockdown. He came here on the back of two pieces of work. I thought he'd run well but thought he would need it. He's in at Leopardstown on Wednesday and I just thought he'd benefit from the run."
Northern Ireland trainers are well represented at the Curragh tonight in both the opening session of three days of racing and the Irish Derby tomorrow.
Donaghadee-based Clare Cannon runs Equulei in the opening two-year-old maiden, Caledon-based trainer Andy Oliver has Whipped Cream in the EBP Fillies maiden and Warrenpoint-based Leanne Breen has course and distance winner Latchet in the mile handicap, with the Noel Kelly-trained Sayesse also a runner.
Draperstown-based Kelly has Best Not Argue and Wooster entered in the Apprentice Derby and Crossgar's Colin McBratney, who was on the scoreboard at Limerick on Monday, has Cautious Approach in the same event.
Grade One-winning National Hunt jockey Rachael Blackmore thinks it is "pretty cool" that she has picked up the ride on King Of The Throne in the Irish Derby.
Blackmore finished second to Paul Townend in the winter championship last season and has been snapped up by Emmet Mullins, nephew of champion trainer Willie, for the Derby outsider.
The pair teamed up last week to win the Listed Martin Moloney Stakes with Oriental Eagle at Limerick. However, Mullins himself will be absent this weekend, having broken Covid-19 protocols earlier this month.
"To be riding in the Irish Derby is pretty cool for me and a fantastic opportunity," said Blackmore, speaking before she rode another winner on the Flat at Fairyhouse. "It's such a prestigious race, and to get an opportunity to do it is a massive deal.
"It's great to be doing it for Emmet as well - we teamed up last weekend for a Listed winner. It's a massive deal to ride in a race like this, a real honour."
Aidan O'Brien fields six in the race, headed by last week's Queen's Vase winner Santiago.
The Authorized colt was a comfortable winner over a mile and six furlongs, but he drops back in trip to 12 furlongs.