The 2015 U.S. Open champion continued to struggle with his putter, posting a four-over 76 for the third round.
The U.S. Open didn't seem to faze him, and he delivered a variety of big shots that led to his sensational finish.
"This is the United States Open". No other information was provided.
It was the 30th time a player has shot 63 in the Majors - both Henrik Stenson and Phil Mickelson posted that score during their classic battle in last year's Open at Troon. "When it is the US Open and you're leading it is a different type of pressure because it is new so I'll see how that goes tomorrow". I've got four weeks off now.
Harris English is 4 under after a second-round 69.
Jack Maguire proved that fortunes can change in a hurry when he drained an eagle putt from off the green on the par-5 first hole.
"I've never been here before", Thomas said.
Jamie Lovemark, Rickie Fowler and J.B. Holmes featured in a three-way tie at six under.
"When I saw it was about seven feet away I knew maybe we had a chance of history". 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.
McIlroy was never in the short grass from the 11th hole to the end on Thursday when he opened with a career-worst 78, and he didn't do almost enough in the second round until it was far too late.
Schauffele double bogeyed the par-3 13th hole. Later, a long put for bogey rolled just right of the hole before he tapped in. Patrick Reed, Paul Casey, Brian Harman and Tommy Fleetwood are at 8 under. It's the first 63 at the U.S. Open since Vijay Singh in 2003 at Olympia Fields and the fifth overall in tournament history.
Yet Johnson was forced to bide his time for the next six holes, unable to convert the few birdie chances that came his way. He tapped in for par. Koepka had the outright lead with four holes left in his round before a bogey on the par-3 sixth hole.
OK, this is his first U.S. Open.
The 26-year-old Reed had eight birdies and one bogey.
Thomas was tied for 24th at two under par, five strokes off the pace after Friday's second round. And it looked like it was about to happen to Casey, who began the day one shot out of the lead after shooting a 6-under-par 66 on Thursday.
Also back in the mix: the mighty Paul Casey. That shot hit halfway up and trickled back down the hill.
He clawed that back with a birdie on the 12th, draining a six-foot putt but was soon in trouble on the 13th, three-putting for bogey.
Here comes Si Woo Kim.
The disappointed 21-year-old declined to be interviewed. He has won one tournament on the PGA Tour.
"Show up for the last six holes, anyway", McIlroy said. He is 3 under for the tournament.
"I really like this golf course; it sets up really well for me, especially if I'm driving it like I did today, " said Johnson, who shot 73 along with a first-round 75 to finish at 148. But that wasn't the problem.
Some will say if he only made the putt on the 15th, he could have shot a 62 and stepped past Johnny Miller, Jack Nicklaus, Tom Weiskopf and Vijay Singh.
Casey was the only golfer who went in the morning.
Big hitters Dustin Johnson, Rory McIlroy and Jason Day were expected to thrive on the wide open fairways of Erin Hills. He doesn't play until Friday afternoon. "It's still Saturday - 36 holes is a very long time in a U.S. Open".
In all, 32 players are within five shots of the lead.
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