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.
"Two weeks ago, just before I came up here, I spoke to one of the course designers, Ron Whitten", Nobilo said on Golf Channel's Live From the U.S. Open show Sunday night, "and I said, 'can you give me an estimation on what might the winning score be here?' He said, 'if the wind blows, four under".
Get daily prep sports headlines from the Gwinnett Daily Post staff delivered to your email. "I think that's been the consensus from everyone", Spieth said Sunday.
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. I thought that the USGA did a phenomenal job this week of allowing the golf course to be what it is and play the way it's supposed to play.
Matsuyama's best round of the day included eight birdies offset by two bogeys. At that point, Koepka was 13 under with five holes left.
Hard to think it would've bothered Koepka, who has seen a lot.
T2. Brian Harman (-12): The tournament changed around the 12th and 13th hole as Harman ended up with bogeys while Koepka began a run of three straight birdies in the group ahead of him. Five more followed on the back nine but two bogeys proved costly.
The course at Erin Hills, the longest ever for a U.S. Open and with wide fairways, played right into the hands of Koepka's big swing.
Koepka gave himself the decisive lead with a series of three birdies at the 14th, 15th and 16th holes and finished 16-under-par to match the record set by Rory McIlroy at the 2011 championship.
Spieth entered the week ranked fifth in the world and fifth in the PGA Tour's season-long FedEx Cup standings, but he knows he and other top players are measured by how they perform in the majors.More news: Pakistan rout India to win maiden ICC Champions Trophy title
One by one the contenders dropped off Sunday afternoon. Potential disaster averted, Koepka proceeded to birdie the next three holes and effectively end the hopes of those in pursuit.
Of the players who fell short, perhaps Tommy Fleetwood has the most cause to be upbeat.
Justin Thomas, the hero of the third round after a record-breaking nine-under-par 63, saw his challenge wilt with a three-over-par 75.
"It hasn't sunk in, obviously, and probably won't for a few days". Brooks is a good friend, so I am happy for him.
As Scheffler waited to be given his gold medal, Champ, who had just finished his round, congratulated him.
One of golf's biggest hitters, the 27-year-old also demonstrated a killer instinct along with a deft touch with the putter, rolling in a monster 41-foot birdie putt at the eighth. He opened with a pair of tap-in birdies and putted for birdie on every hole but the par-3 13th.
"It was bombs away, you could hit it far and the fairways were generous enough".
BBC Radio 5 live's Jay Townsend said in commentary that Koepka only seriously got into golf after being involved in a vehicle accident at the age of 10.
That winning feeling was so sweet for Brooks Koepka after he sunk the final putt on the 18th. His most recent win overall came on the Japan Golf Tour, when he won the Dunlop Phoenix Tournament in November 2016, shooting 21-under. Koepka won five total events in Europe, where he met his Scottish caddie, Ricky Elliot, and learned to handle windy links courses, similar to the setup at Erin Hills.