Patrick Reed is the latest top player to confirm their entry for the Irish Open at Royal County Down in May.
The American world number 14 has won four PGA Tour titles, including a one-stroke victory in the 2014 WGC-Cadillac Championship at Doral.
Reed, 24, showed passion and aggression in the Ryder Cup last September as he starred for the losing US team, with the rookie unbeaten over three days.
Rory McIlroy will be among the star players at the 28-31 May tournament.
The Holywood man will be joined at the famous links course by fellow Northern Ireland major winners Graeme McDowell and Darren Clarke.
Padraig Harrington, Rickie Fowler, Sergio Garcia, Ernie Els and Lee Westwood are also among the entries.
Tournament organisers have said that tens of thousands of tickets have already been sold for the event.
Reed announced his intention to compete at the Irish Open after he finished tied 22nd in the Masters at Augusta.
His other tour victories came in the 2013 Wyndham Championship, last year's Humana Challenge and the Hyundai Tournament of Champions in January.