Padraig Harrington shot a first round four under par 67 at The Barclays at Liberty National Golf Club in Jersey City to end the day in a tie for eighth place, two strokes behind the joint leaders.
The triple major winner continued the good form he showed in his last two tournaments by carding four birdies in a bogey-free round to enter the clubhouse four under par.
Paul Goydos, Steve Marino and Sergio Garcia co-lead the tournament after round one on six under par.
Tiger Woods shot a one under par 70 and is five shots back.
Greatest quotes of Irish hero Michael Collins recalled