Carlos Ortiz and Tyrrell Hatton also slashed away in slushy lies, all making mistakes that cost them a chance to survive this beast of a day.

The rain that put Oakmont on the edge of being unplayable might have saved Spaun.

One shot behind at the start of the day, he opened with five bogeys in six holes with some horrific breaks, none worse than hitting the pin on the second hole and seeing it spin back to the fairway. And then came a rain delay of 1 hour, 37 minutes.

“The weather delay changed the whole vibe of the day,” Spaun said.

Remarkably, he made only one bogey the rest of the way.

But oh, that finish.

MacIntyre, the 28-year-old from Oban toughened by the Scottish game of Shinty, became the new target. He also struggled at the start and fell nine shots behind at one point. But he birdied the 17th and split the fairway on the 18th for a key par, a 68 and the clubhouse lead.

Three groups later, Spaun delivered what looked like the winner, a powerful fade that rolled onto the green like a putt and settled 18 feet behind the cup.

And then the final putt — no one made a longer one all week. He was helped by Viktor Hovland being on the same line and going first. Spaun rapped it through the soaked turf, walked to the left to watch it break right toward the hole and watched it drop as thousands of rain-soaked spectators erupted.

He raised both arms and tossed his putter, jumping into the arms of caddie Mark Carens.

The celebration carried into those who lost the battle.

MacIntyre, so close to becoming Scotland’s first major champion since Paul Lawrie in 1999, sat in the scoring tent in front of a TV and applauded.

Hatton was talking with reporters, bemoaning how a bad break on the 17th ended his chances of winning. He watched Spaun’s putt and it brightened his mood.

“Unbelievable. What a putt to win. That’s incredible,” he said. “I’m sad about how I finished, but I’m very happy for J.J. To win a major in that fashion is amazing.”

Hovland, who shot 73 to finish third, saw it all — the putt at the end, the bogeys at the start.

“After his start, it just looked like he was out of it immediately,” Hovland said. “Everyone came back to the pack. I wasn’t expecting that really. I thought I had to shoot maybe 3-under par today to have a good chance, but obviously the conditions got really, really tough, and this golf course is just a beast.”

Hatton (72) and Ortiz (73), both part of LIV Golf and in serious contention at a major for the first time, tied for fourth along with Cameron Young (70). The consolation for Ortiz was getting into the Masters next year.

Scottie Scheffler, 10 shots behind early in the final round, was somehow still part of the conversation on the back nine. But he missed far too many birdie chances, even three-putting from 12 feet on the 11th hole. The world’s No. 1 player finished with a 70 to tie for seventh with Jon Rahm (67) and Burns, his best friend who will feel the sting.

He had a double bogey by missing the green into a bad lie on the slope of a bunker. He missed a pair of 6-foot birdie putts to seize control. And then he made a mess of the 15th for another double bogey.

Through it all, Spaun emerged as a U.S. Open champion hardly anyone saw coming — not at the start of the year, not at the start of the round.