The 117th edition of the US Open gets underway on Thursday morning from Erin Hills golf course in Wisconsin.
Irish hopes of claiming a first major since Darren Clarke won the Open Championship in 2011 lie in hands of Rory McIlroy, Graeme McDowell, Shane Lowry and Paul Dunne.
Dunne tees off on Thursday morning at 07:18 (13:18 Irish time) alongside David Lingmerth and Hao Tong Li.
G Mac starts with English duo Lee Westwood and Ross Fisher at 08:02 (14:02 Irish time).
Shane Lowry gets his campaign underway at 13:58 (19:58 Irish time) with Americans Scott Piercy and Jim Furyk.
In truth, Ireland's best hope of coming back across the Atlantic with some silverware is Rory McIlroy. Jason Day, Justin Rose and McIlroy take to the tee at 14:09 (20:09 Irish time) in what is a very talented group.
The best of the other groups include, last year's winner Dustin Johnson, Jordan Speith and Martin Kaymer while Henrik Stenson, Charl Schwartzel and Louis Oosthuizen set off around the course together.
Phil Mickelson will be rushing from his daughter's graduation on Thursday so his involvement is still up in the air, but if he is to make it on time, he'll be out alongside Steve Stricker and Stewart Cink.