He's six shots off the lead heading into day 2.
Shane Lowry shot an impressive 3-under-par first round of 67 at the Honda Classic in Florida.
That leaves the Offaly native in a tie for 7th and six shots off the lead.
Matt Jones leads on 9 under.
2015 winner Padraig Harrington will restart from 2 over, with Graeme McDowell back on 9-over after a nightmare first round of 79.