The 2022 PGA Championship winner followed an opening 73 with an 11-over-par 81 in Friday's second round of the U.S Open, adding up to a 14-over 154 card at Los Angeles Country Club's North Course.

That was good enough to beat only three of his competitors out of a field of 156.

Calling it "humiliating and embarrassing", Thomas told reporters he was left stunned after a good week of practice had left him optimistic.

"I was playing the best I've played in a really long time this week," Thomas, who also won the PGA Championship in 2017, said.

"It can leave you speechless, both good and bad, and right now it's unfortunate.

"Once I'm able to reflect and figure out what I can learn and get better from, it'll end up good. But it sucks right now."

Thomas' 81 was the second-worst score of his PGA Tour career.

Mistakes compounded when he made back-to-back double bogeys at the par-4 6th and par-3 7th holes due to out-of-bounds tee shots.

He finished the day with three doubles, seven bogeys and just two birdies.

The 15-time Tour winner hit only 11 of 26 fairways through two days at LACC.

Since placing fourth at the WM Phoenix Open in February, Thomas has just one top-10 finish in his past 10 starts, a stretch in which he has missed three cuts.

The 30-year-old took the perspective that his slump will be temporary.

"I'll figure it out," Thomas said. "I have another major left.

"If I go win the British Open, nobody even remembers that I've missed the cut by a zillion here, so I've just got to find a way to get better and learn from this.

"If I can, I don't have to look at this week as a total failure."