He scored a 3-under 69 in windy conditions that left him 1 over for the tournament. He found stardom right at home as the U.S. Open champion.
Emotion? The most he displayed was a light fist pump, his hand clenched a little tighter with each birdie, and a double fist pump on the 18th when he tapped in for par. And he may just be getting started. "But Brooks played so well today".
Koepka, 27, grabbed control with three straight birdies on the back nine at Erin Hills.
With the wind ripping at his back, he sunk another birdie putt at No. 14, after spinning his approach shot to 5 feet beyond the hole. Stricker tapped in for par. "I think that's been the consensus from everybody".
He's not slowing down either.
"Struck it well, hit a bunch of greens, and that's what you've got to do to play well around here".
He's not sure if his wife, Nicki, will repeat as his caddie next week, though.
He shot a 69 to finish at 1 over for the tournament.
When asked to rate his confidence level, Spieth assigned himself a "B", though he graded himself at an "A" with his putter. I got off to a pretty good start, which I really haven't done yet, so that was nice.
"I hope the moment will come as soon as possible".
NOTES: Scottie Scheffler, who plays collegiately for the University of Texas, was the top amateur finisher at 287 for the tournament with a Sunday round of 73.More news: Hasan Ali reveals his best wicket of Champions Trophy
Lee Westwood's 76 perhaps impacted on post-round sentiment but the Englishman made it clear he would be in no hurry to return to Erin Hills.
Harman finishing runner-up at 12-under par along with Hideki Matsuyama. Only four left-handers-Bubba Watson, Phil Mickelson, Mike Weir and Bob Charles-have won major championships. "They've got no fear", Stricker said.
And the 26-year-old from Southport, who finished a shot ahead of world number one Dustin Johnson to claim his second European Tour title in Abu Dhabi in January, paid tribute to Finnis. He also won the Open in 1994, as well as the British Open in 2002 and 2012. He was 13th past year at Oakmont.
Impossible not to grade a fail, but a word to the wise: Don't be fooled by the 21-year-old's disastrous weekend in his major championship debut.
But Els seems at peace with where he is at in his career.
It capped a week where the biggest names vanished after two rounds leaving the leaderboard a collection of rarely seen names. If not, it's fine. Not his best, but he said the course was fair. "So if that doesn't happen, it's been good". One year later, however, he really took charge of Europe's second circuit.
After tying for 45th at the Memorial last month, Matsuyama arrived at Erin Hills on a downturn. But each would come up short again, as this turned out to be Brooks Koepka's turn. Mullinax qualified out of the Memphis, Tennessee, sectional.
Matsuyama's best round of the day included eight birdies offset by two bogeys.
"What I've done this week is incredible", Koepka.
The week ended with 31 players under par, breaking the U.S. Open record of 28 players at Medinah in 1990.
Koepka tied for 13th in last year's Open at Oakmont. It features a silhouette of Palmer in mid-stride, tossing his visor in the air.