Top 3 miss US Open cut, leaving 4-way tie for lead

Jamie Lovemark, Rickie Fowler and J.B. Holmes, meanwhile, are a shot further back from the leaders. Back in May, Harman won the Wells Fargo Championship in Wilmington, North Carolina. Vijay Singh was the last player to accomplish the feat in 2003 at Olympia Fields.

It was the 31st score of 63 in major championship history. The total to par sets Thomas apart.

"It's been an off-week for me with the putting", said the former world No.1, whose back nine of 40 included a double-bogey seven on the 18th. "Wish he was calling it - to hear what he would've said", Thomas shared. "And I'm kind of going out there and just doing it, and letting it go".

"Obviously, I'm not here on the weekend, so it's unfortunate", Day said. "It's just a matter of getting it out of me and getting myself in the right frame of mind". The experience of building on an opening-round 59 will help, he said. Bare statistics might tell a different story but it is incredible to think that does not even register as his finest round of 2017.

None of the leaders had as shaky a stretch as Casey, who made 8 on the par-5 14th hole - after hitting into the fescue and almost whiffing on his swing to get out - and bogeyed the next hole.

Fellow Australians Wade Ormsby (six-over after a second 75) and Nick Flanagan (10-over after a 79) also went home early, joining Johnson (four-over after a 73) and four-time major victor McIlroy (five-over after a 71).

Numerous top players in the world did not make the cut after Friday's second round, including the top three ranked players, Dustin Johnson, Rory McIlroy and Jason Day. The forecast for Sunday looks good and there is chance for the first significant wind of the week. He missed almost two months at the start of the year when he was diagnosed with a slight rib fracture, and then the latest break after The Players Championship. He'll return at next month's British Open at Royal Birkdale.

Paul Casey's triple bogey seven at the 3rd proved a blow from which he could not recover; the Englishman came perilously close to missing his ball in thigh-high greenside rough.

There was a great moment on the 18th green.

The course had been softened by rain earlier in the week, and it finally played the way the USGA wanted in the final round. "It's sometimes nice being out front because you can afford to make a mistake". "But you're talking polar opposites".

Harman narrowly missed out on a final-hole birdie, with his five-under 67 maintaining his advantage heading into Sunday.

But the second-ranked player in the world still has a lot of ground to make up at Erin Hills.

Similar scoring had initially appeared a possibility at Erin Hills, which became the longest course in major championship history at 7,845 yards in the first round and featured such thick fescue grass that patches had to be chopped down on four holes on Tuesday. Matsuyama is part of the group at 5 under (that also includes Open rookies Si Woo Kim, Xander Schauffele and amateur Cameron Champ) and had a simple explanation why: "The biggest difference was I putted very well today".

Day and McIlroy never had much of a chance, both out of the picture before Johnson even teed off.