US PGA winner Keegan Bradley has signed up to play in the Irish Open at Royal Portrush, meaning three of the four major winners will compete.
"I'm proud of my Irish heritage and I've wanted to represent it in the Irish national championship," said Bradley, whose roots are in Co Cork.
Edoardo and Francesco Molinari will also play in the 28 June-1 July event.
The participation of the Italian brothers means half of the victorious 2010 European Ryder Cup team have confirmed their entry.
They include former US Open champion Graeme McDowell and three-time major winner Padraig Harrington.
Bradley became only the third player to win on his major championship debut when he defeated Jason Dufner in a play-off at the Atlanta Athletic Club.
The former all-state ski racer, who was named 2011 US PGA Tour Rookie of the Year, has talked to McDowell and Clarke about the famous Co Antrim links.
"Graeme and Darren have both told me what a fabulous layout Portrush is, so I'm doubly excited about the opportunity to compete there," he added.