Rory McIlroy is best placed of the Irish on one over par.
Shane Lowry endured an up and down opening day on the Oak Hills course for this year's PGA Championship.
The Clara man dropped a pair of shots on his first nine holes.
One of those was retrieved as he birdied the first, his 10th, but another two bogeys came on the way home, leaving the 2019 Open Champion midpack in the field.
Rory McIlroy battled an unspecified illness to card a one over par 71, Padraig Harrington was two over, while Seamus Power was four over par.
Eric Cole has four to play but leads the field on five under.
Westmeath SHC: Ending Championship Drought On The Cards For Lough Lene Gaels
Midlands LGFA Champions Looking To Book Provincial Semi-Final Spots
Laois SFC: Consistency The Message From Portarlington Manager
Portlaoise Panthers Aiming To Return To Winning Ways
Westmeath SHC: Castletown Geoghegan And Lough Lene Gaels Set For Bank Holiday Clash
Buccaneers Travel To Wexford In AIL This Weekend
Offaly SFC: Ferbane Looking To End Six Year Championship Drought
Laois SFC: A Second Chance Awaits Courtwood
Portlaoise Panthers Looking To Continue 100% Start
Westmeath SFC: Coralstown Kinnegad Looking To End 29 Year Famine
Offaly SFC: Tullamore And Ferbane Set For Trilogy
Milltown Secure Westmeath Ladies Football Championship
Medals Secured For Midlands Boxer At European U15 Championships
Westmeath SFC: A Repeat Of 2022 The Motivation For The Down's
Westmeath Seeks Government Backing For €78m Sports Complex Plans
Offaly SHC: Shinrone Fightback Not Enough In The End
Clara Star Nominated For Player Of The Year Award
"There's Work To Be Done To Sign Players"
CCFL: Scoreless Draw Leaves Clonaslee Bottom Of Senior Division
Laois SHC: Champions Stand Up To Be Counted When It Matters Most