However, the 26-year-old then bogeyed the sixth after hitting a poor chip across the green and dropped another shot on the eighth after firing his approach over the green.
American Brian Harman, playing in his first major since missing the cut in all four in 2015, was the surprise leader on 12 under, the 30-year-old attempting to become the first left-hander to win the title in a week which saw six-time runner-up Phil Mickelson opt to attend his daughter's high-school graduation rather than compete. Champ missed a long putt for birdie on the 18th hole that would have tied Scheffler.
"It's unbelievable", he said. I love that about Muirfield Village which I think is a great example as well.
Day and McIlroy, just to name a few, might not make it that far.
Tied for the lead with six holes to play, Koepka made an 8-foot par putt on the 13th hole.
Tommy Fleetwood grinded all week to finish solo fourth at 11 under.
Koepka's 16-under par total matches Rory McIlroy's at Congressional in 2011. His tee shot went just 209 yards - it looked like it juuust got to the start of the fairway.
He followed with birdies at 15 and 16 to suddenly widen his gap to four shots and close in on the Open championship. That run put him alone in second place and one behind Koepka, who was through 13 holes.
"I'm proud of the way I hung in there today".
Rickie Fowler said it was "fun" to play Erin Hills, which is an unusual descriptor for the U.S. Open. I felt like I did a lot of good things, especially in the first round, executing my game plan. "Then three-putt the next two holes".
"Anytime you've seen the golf courses, U.S. Open venues, work back towards even par, there are complaints".
"I think I was just more aggressive than in the second round", he said about his third-round 82.
Summerhays will continue his current string of eight straight tour events, including the U.S. Open, with two more stops.
"After that, it was kind of lights out", Harman said.
Matsuyama's 66 was the best score on a windy final day, one better than Koepka.
A changing of golf's old guard has been underway for some time but the 117th U.S. Open signaled that it can be considered complete with neither Phil Mickelson and/or Tiger Woods teeing up at major for the first time since the 1994 U.S. Masters.
Well, not exactly. "If I could do it over again, I'd play baseball-100 percent, no doubt", he says.
But Erin Hills, hosting its first major championship, finally played like a US Open course on Sunday, with 20-25 mile per hour winds wreaking havoc on the tee box and playing like the hard links-style course that the United States Golf Association envisioned when it booked the event. He left as a major champion. Harman did not fade or choke at all in what presented a totally new challenge in 20 miles per hour winds compared to the first three favorable scoring days at Erin Hills.