OAKMONT, Pa. (AP) — J.J. Spaun is still new enough to the U.S. Open, and a newcomer to the brute that is Oakmont, that he was prepared for anything Thursday. He wound up with a clean card and a one-shot lead on an opening day that delivered just about everything.

Scottie Scheffler had more bogeys in one round than he made had the entire tournament when he won the Memorial. He shot a 73, his highest start ever in a U.S. Open, four shots worse than when he made his Open debut at Oakmont as a 19-year-old at Texas.

Patrick Reed made the first albatross in 11 years at the U.S. Open when he holed out a 3-wood from 286 yards on the par-5 fourth. He finished with a triple bogey.

Bryson DeChambeau was 39 yards away from the hole at the par-5 12th and took four shots from the rough to get to the green.

Si Woo Kim shot a 68 and had no idea how.

“Honestly, I don’t even know what I’m doing on the course,” Kim said. “Kind of hitting good but feel like this course is too hard for me.”

Through it all, Spaun played a steady hand in only his second U.S. Open. He played bogey-free and finished with 10 straight pars for a 4-under 66 on America’s toughest course hosting the major know as the toughest test in golf.

He matched the low opening round in U.S. Opens at Oakmont — Andrew Landry also shot 66 the last time here in 2016 — and it was no mystery. Good putting never fails at any U.S. Open, and Spaun holed five par putts ranging from 7 feet to 16 feet to go along with four birdies.

“I didn’t really feel like I’m going to show a bogey-free round 4 under. I didn’t really know what to expect especially since I’ve never played here,” said Spaun, playing in only his second U.S. Open. “But yeah, maybe sometimes not having expectations is the best thing, so I’ll take it.”

Oakmont lived up to its reputation with a scoring average of about 74.6 despite a course still relatively soft from rain and moderate wind that didn’t stick around for long.

And oh, that rough.

Just ask Rory McIlroy, although he chose not to speak for the fifth straight competitive round at a major since his Masters victory. He had to hack out three times on the fourth hole to get it back to the fairway, and then he holed a 30-foot putt for a most unlikely bogey. He shot 74.

“Even for a guy like me, I can’t get out of it some of the times, depending on the lie,” DeChambeau said after a 73. “It was tough. It was a brutal test of golf.”

The start of the round included Maxwell Moldovan holing out for eagle on the 484-yard opening hole. Toward the end, Tony Finau hit an approach just over the green, off a sprinkler head and into the grandstand, his Titleist marked by green paint of the sprinkler. He saved par.