Adam Scott has thrown the cat amongst the pigeons by shooting the equal second-lowest final round score in US Open history.

The former world No.1 scorched the difficult Chambers Bay course with a flawless six-under-par 64, moving him to three-under for the championship and into the clubhouse lead.

Scott sat two shots behind leaders Jordan Spieth and Branden Grace who were five-under through 13 holes while Dustin Johnson was four-under through 12 holes.

Scott’s 64 sits behind only Johnny Miller’s 63 (eight-under) at Oakmont in 1973 which carried the American to victory.

Peter Jacobson, (seven-under) in 1988 at The Country Club, and Tom Kite and Vijay Singh, (six-under) at Southern Hills in 2001, have also posted final round 64s in the championship.

Scott knocked in three birdies on each side of the course, with two birdies in his last three, to send a scare through those behind him.

The 34-year-old was holding out faint hopes of getting into an 18-hole playoff on Monday.

“I’d love to come back and play 18 holes tomorrow and have another shot at it,” said Scott.

“I feel like I had nothing to lose today and everything to gain.

“I knew I was playing well and I just couldn’t quite put it all together the first three days. I really wanted to today.

“To be honest, it’s the kind of round I needed to get things going for me this year, hopefully.

“The course was set up quite short. I played really well and I took advantage of some of the holes playing a bit shorter and didn’t have any disasters and hit a few good shots and took advantage of them.

“It’s kind of what I needed to even think about having a chance and you never know what can happen in these events.

“Even though it’s not playing long and tough to finish and the wind is down, it’s tough to hole out down the stretch of a major.

“It will be fun the next couple of hours for me to watch.”