He tees off around 5:30pm Irish time.
Shane Lowry, Rory McIlroy, Padraig Harrington and Graeme McDowell are all in the field for the Arnold Palmer Invitational, which tees off in Florida later.
The Open champion plays with Ian Poulter and Kevin Na - they are out just before 5.30.
Past winner McIlroy plays alongside Tyrrell Hatton and Francesco Molinari.
Englishman Hatton is the defending champion.
He says it was an achievement he'll never forget:
They tee off just after 1pm Irish time.
McDowell's out around 5.15 and European Ryder Cup captain Harrington tees off after 6.
Full Interview: Portarlington Footballer Ronan Coffey
Full Interview: The Down's Manager Dermot Power
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Ballinagar And Milltown To Meet In Leinster Intermediate Quarter-Final
Ronan Coffey Praises Portarlington’s Young Guns Ahead Of Leinster Quarter-Final
Mauricio Pochettino Set To Be Appointed Manchester United Manager
Darragh Murray Named In Irish Squad For Fiji Clash
Portlaoise Panthers Aiming To Bounce Back In Division One
Portarlington On The Road In Leinster
The Down's Building Towards Leinster Football Quarter-Final
Laois Provisional League Fixtures Revealed
The Harps Manager Praises His Sides Efforts In Leinster
Buccaneers Claim Back To Back AIL Wins
Kilcormac Killoughey Captain Full Of Praise For Goalkeeper
Lough Lene Gaels Suffer Late Heartbreak In Leinster Quarter-Final
Crookedwood Win Leinster Junior Camogie Title
Conor Slevin Wins Dramatic Leinster Quarter-Final For Kilcormac Killoughey
Ireland Secure Comfortable Win Over Argentina
Kilcormac Killoughey Seal Win But Heartbreak For Lough Lene Gaels And The Harps