Rory McIlroy has started strongly at the Players Championship in Florida. A consistent round saw him shoot 67, to finish on five under par.
McIlroy has been a presence on leaderboards every time he has played this year, and he managed to shoot a bogey-free round.
"I'm comfortable with my game, doing everything well," said the Northern Irishman, who for all his good play this year is yet to win.
It wasn't such a good day for Seamus Power, whose 74 has left him with plenty of work to do tomorrow, while Shane Lowry went out later.
Tommy Fleetwood grabbed the clubhouse lead, piling up six birdies on the more difficult front nine to set a cracking pace with a bogey-free seven-under-par 65 in Ponte Vedra Beach.
"You can only play yourself out of it in round one. I've done a good job of keeping myself in it," Fleetwood told reporters.
Fleetwood, who played the back nine first, did not take advantage of still conditions early, instead making his move after the wind started to make its presence felt.
"The wind picked up and there were some tough holes there," he said. "But I drove it so well I was always in a good position.
"If you're in the fairway the course feels very, very different. It's a massive key around here and then I started picking a few shots up. If you hit it well like I did today you're going to have chances and you can shoot a score."
He would later be joined on seven under by Keegan Bradley.
Perhaps the biggest surprise of the morning was a 74 by world number two Justin Rose, who had a nightmare triple-bogey at his 10th hole, the par-four first.
He was in a greenside bunker in two shots, but took two attempts to get out of the sand, and three more to hole out.
While Rose dropped three shots in one hole, American Harris English picked up the same number with an albatross at the par-five 11th, where his second shot from 235 yards landed softly a couple of paces in front of the cup and rolled in.