Scottie Scheffler was left to rue "another frustrating day" at the US Open on Saturday, when Collin Morikawa found form on moving day at Pinehurst.

World number one Scheffler struggled once again in North Carolina, carding a one-over 71 to drop down to six-over par after the third day.

The two-time Masters champion has now shot four consecutive rounds over par for the first time in his professional career and catching the likes of Matthieu Pavon, Bryson Dechambeau and Tony Finau appears unlikely.

"Another frustrating day," Scheffler said on Sky Sports after his putter went cold once more. "Today was a day where I thought I played a lot better than my score.

"I'm having a lot of trouble reading these greens. I had a lot of putts today where I felt like I hit it really good. I looked up and they were not going the way I thought they were going to go."

Morikawa, in stark contrast, went on a hot streak with his putter and finished with a four-under 66 to move back to level par, sneaking within touching distance of the top 10.

The two-time major champion still has serious ground to make up to catch the leading trio on Sunday, with Ludvig Aberg, Patrick Cantlay, Corey Conners and Tyrrell Hatton all chasing at the top as well.

"If I play the way I did today, who knows what could happen," Morikawa said. "This course is only going to get tougher.

"I know it's not going to be easy. Today was not easy by any means. I just put it in the right spot, kept the ball in front of me, really just played very simple golf."

Rory McIlroy remains in with the contending pack, aiming to end a 10-year wait for major success, but may be concerned if countryman Shane Lowry's words are anything to go by.

Lowry stayed on five-over for the tournament after battling through "torture" from the Pinehurst No.2 course, offering a warning to all competing this weekend.

"It's torture out there, honestly it's absolute mental torture," Lowry said. "That's the best level par I've ever shot in my life.

"Every single shot you have, even when you hit a good shot the putts you have, it's brutally difficult. It's not much crack out there, to be honest.

"The wind's in a different direction so some of the par fours are really long. You really just have to manage your way well around there and I did a great job today."