Bertram Allen grabbed glory in decisive fashion in Sunday's Grand Prix at the four-star meeting in Stockholm.
Riding Quiet Easy, with whom he won Saturday night's speed class at the Scandinavian venue, the Wexford rider was one of six to qualify for the jump-off.
Only three combinations managed a second clear, with Allen and Quiet Easy by far the sharpest, the pairing ousting runner-up Meredith Michaels-Beerbaum on Aspara by over two-and-a-half seconds.
The win marks another four-star Grand Prix success of the weekend for Ireland, with Conor Swail and Viva Colombia having taken the honours in Florida last night (Saturday).
Ireland's Conor Swail took the honours in Saturday night's $212,000 Grand Prix at the four-star show in Palm Beach.
Partnering 10-year-old mare Viva Colombia, the Down rider was one of eight to make the jump-off out of a starting round of 32.
Second-last to go in the decider, the pairing left everything intact and clipped over a quarter of a second of the lead time of Mexican Eugenio Garza on Bariano to claim top spot.
"She's just getting better and better," said Swail of Viva Columbia.
"I thought tonight she was just wonderful."
American Hardin Towell gave the host nation a place on the podium by finishing third riding New York.
Swail also scooped the closing class on Sunday, winning a 12-horse jump-off on Martha Louiseand Cita.