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.