This is 27-year-old Koepka's first major championship win.
As Brian Harman began to fade, Koepka poured it on with birdies over the next three holes, lightly pumping his fist after each one.
One of golf's biggest hitters, Koepka also demonstrated he has a touch with the putter rolling in a monster 41-foot birdie putt at the eighth to reach the turn at three-under for the day and 14-under overall, in sight of his first major title.
"Yeah, I like it", he said about Erin Hills.
US Open a success for pair of Wisconsin golfers
This week alone, nine players reached at least 10 under and seven finished there. "I'm looking forward to my shot at it". I hit good iron shots early on and good drives so I never really felt it was a struggle and didn't miss many shots.
Koepka was also tied for fourth in the US Open in 2014 - albeit 10 shots behind runaway victor Martin Kaymer - and shot 71 at Erin Hills in the 2011 US Amateur, although he failed to reach the matchplay stages.
"The world number 50 headed to the clubhouse on 12 under, one ahead of Thomas, Brooks Koepka and England's Tommy Fleetwood. But if you play well, which is obviously what this championship is trying to identify, it's a very, very fine and playable golf course".
China's Li Haotong demonstrated what could go wrong as he struggled to an 84 which contained two birdies, two double bogeys, a triple bogey and seven bogeys, six of which came in succession from the third. At this year's Masters, he entered the final round trailing by one but shot a 76 and was far from the drama between Garcia and Justin Rose. He posted a disappointing 2.000 putt per GIR and -0.041 SG: Putting, taking 30 total putts. I wouldn't want to play with the opposite wind because there would be some holes that would be a bit stupid.
Justin Thomas broke the record for the lowest-ever US Open round in relation to par here on Saturday, but he does not hold the mantle of the greatest ever US Open round.
Amazon-Whole Foods Tie-Up Could Shake Up Canadian Supermarkets
Wal-Mart reported $6.9 billion in cash and equivalents and $20.9 billion in free cash flow at its year ended January 31. What's more, Amazon is taking steps to increase Prime membership by making it easier to afford for those that need it.
Xander Schauffele, a rookie on the PGA Tour playing in his first U.S. Open, birdied his last hole for a 69 to tie for fifth at 10-under 268 along with Bill Haas (69) and Rickie Fowler (72), who was poised at yet another major to win only to fall back.
The deadlock was broken when Harman's tee-shot on the 12th landed into the deep fescue, forcing him to hack out onto the fairway.
Kite shot even-par 72 in gusty winds in 1992 at Pebble Beach, winning by two strokes over Jeff Sluman. If you read my post, it says I love the design. While stronger winds made tee-to-green play more hard during the final round, they may have also helped Spieth on the greens where he needed only 29 putts.
Fleetwood picked up a victory in Abu Dhabi on the European Tour while Fowler is widely regarded right now as the best golfer never to have won a major.
Rescue crew manages to retrieve the missing sailors
Sykes says her son told her that sailors initially believed they were under attack and some immediately went to man the guns. Footage from Japanese broadcaster NHK showed a sharp horizontal cut across the bow area, which looked like a shark's mouth.
- Helmut Kohl, architect of unified Germany, dead at 87
- Pakistan Beat India To Win ICC Champions Trophy
- Edgbaston to Cardiff too much of an ask to adjust to - Morgan
- Morgan lauds 'brilliant' bowling display from England
- Rallies against Islamic law draw counter-protests in Chicago, across US
- Beyonce and Jay Z welcome their twins!
- Confederations Cup: Late Moreno header earns Mexico draw with Portugal
- Trump's financial disclosure reveals increased income from Mar-a
- Britain to Hold Rare Two-Year Parliament Session Over Brexit
- CNN's Jake Tapper Is Confused As Hell During Interview With Trump's Lawyer