Birdies at the final two holes saw Jon Rahm claim his first Major title as he finished six-under-par at the US Open at Torrey Pines.
Not only was it Rahm's first success, but he also became the first Spaniard to win the tournament as he finished one stroke ahead of South African Louis Oosthuizen.
There was disappointment for county Down golfer Rory McIlroy as his push for a first Major since 2014 came unstuck on the back nine. Three dropped shots in two holes proved fatal to his hopes and he ended five shots behind Rahm on one-under-par.
He was not alone in that as 2020 champion Bryson DeChambeau went from a front-nine five-under-par leading score to finishing well down the field on three-over-par after a calamitous run in.
Shane Lowry also had a Sunday to forget as he ended the tournament on 13-over-par after a closing 79.
It was Rahm who was left standing in San Diego and he will prove a popular winner after being forced to withdraw from the Memorial Tournament earlier this month despite being six shots in front after three rounds having tested positive for Covid-19.
"I'm a big believer in karma and after what happened a couple of weeks ago I stayed really positive, knowing big things were coming," Rahm told the Golf Channel after his win.
Oosthuizen, Mackenzie Hughes and Russell Henley shared the lead at the start of the final round in Michigan on five-under-par, but a high-quality chasing pack wasted no time in closing the gap to the leaders, with Rahm moving to three-under-par with a birdie on the first.
Rahm also birdied the second from close range and made a brilliant up and down from left of the third green to remain just a shot off the lead.
Henley’s bogey on the fifth made it a four-way tie for the lead, but that did not last long.
DeChambeau came agonisingly close to making a hole-in-one on the eighth before tapping in for the simplest of birdies to lead on five-under.
Moments later McIlroy had the chance to join him, but missed from seven feet on the seventh.
Oosthuizen joined DeChambeau at the top of the leaderboard with a birdie on the ninth and suddenly had a two-shot lead when he also birdied the 10th as DeChambeau dropped a shot on the 11th.
The par-three 11th was proving to be a crucial hole, with McIlroy three-putting it and Oosthuizen also making a bogey after missing the green.
Most damagingly of all, Hughes saw his pulled tee shot get stuck in the branches of a tree and the resulting double bogey dropped him back to two-under-par.
Three birdies in the last five holes had seen Harris English set the clubhouse target on three under and that was beginning to look highly competitive with all the challengers - bar Rahm and Oosthuizen - falling away.
However, Rahm holed a superb, curling birdie putt on the 17th to move into a share of the lead and amazingly repeated the feat on the 18th to prompt a massive roar from the crowds beside the green.
His wife Kelley and young son Kepa were the first to greet Rahm as he headed off to sign his card and wait to see if Oosthuizen could deny him a first major title.
Oosthuizen pulled his drive on the 17th into a hazard and was unable to save par, meaning he needed to eagle the last – as he did on Saturday – to force a play-off.
His tee shot just crept into the rough though and after much consideration, the player was left with no option but to lay up. That meant he needed a tournament-saving pitch in from the fairway, but despite a good effort the hole wasn’t troubled and Rahm was crowned champion.
Lowry finished a frustrating week with a horror 79 that saw him end on 13-over-par.
The Offaly man had made the cut by a single shot after opening rounds of 72 and 74 and followed that with a 72 before it all went wrong on Sunday.
He failed to make a birdie and had already hit six bogeys before a double-bogey on the par-five 18th.
Phil Mickelson's "unique opportunity" to complete the career grand slam in his home city of San Diego came to a strange end.
Mickelson began the week with renewed hope of winning his national open for the first time, but ended it by hitting his approach to the 18th around 70 yards beyond the hole and completing a 75 to finish 11 over par, almost two hours before the final group was due to tee off.
The 51-year-old was disappointed not to have played better, but remains confident he can replicate the form which made him the oldest major championship in last month’s US PGA Championship.
"There’s some opportunities coming up with the way I’ve been playing that I’m optimistic that I can compete and contend," the six-time major winner said.
"There’s nothing more fun for me than to be in it on the weekend. I’ve actually been playing well enough to have chances, and we have some good tournaments coming up the next couple of months.
"Afterwards I’ll look back and reminisce when the season’s over and I’ll still have that Wanamaker trophy I’ll be looking at, and I’m still looking to add a friend to it along the line.
"That win was very meaningful to me because I’ve been putting in a lot of work the last couple of years and getting nothing out of it, and so to have a moment like that is something that makes it worthwhile."