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Rory McIlroy lies nine shots off the clubhouse lead after carding a four-over 74 in the first round of the US PGA Championship at Baltusrol.
The Northern Irishman started the final major of 2016 at the 10th hole and had three bogeys in his opening seven holes and no birdies during his round.
Jimmy Walker set the early pace with a five-under 65, while defending champion Jason Day shot 70.
Masters champion Danny Willett is among the late starters in New Jersey.
The Englishman is playing, in line with PGA tradition, with the two other major winners of this year, American Dustin Johnson, who won the US Open, and Open champion Henrik Stenson of Sweden.
McIlroy, the world number four, said before his opening round that the Baltusrol layout gave him a good chance of securing a third US PGA Championship, after winning the title in 2012 and 2014.
Playing alongside Australian Day and American Phil Mickelson, who pushed Stenson close at The Open earlier this month, McIlroy missed two birdie putts in his first two holes.
A duffed chip and miss from six feet led to his first bogey on the 13th and he dropped shots on the 14th and 16th after hitting his ball into greenside bunkers on both holes.
McIlroy missed a five-foot chance for birdie on the par-five 17th and a wild drive on the 18th, the only other par-five hole on the course, led to a par.
Day, who had only one practice round after catching a bug off his son and then spending Tuesday night in hospital after his wife suffered an allergic reaction, had three birdies and a bogey in his two-under round.
Mickelson, who briefly joined McIlroy at four over, battled back to one over with three birdies in five holes.