Jason Day's US Open campaign is on life support after he was among a host of big-name casualties taken by host Shinnecock Hills during a disastrous first round.
Tipped as one of the pre-tournament favourites, world No.8 Day equalled his worst score at the US Open during a nine-over-par 79 at the notoriously difficult Long Island course.
It left Day, whose stellar US Open record includes two runner-up results and three other top 10 finishes, a whopping 10 shots back of the lead.
World No.1 Dustin Johnson shot 69 to join Ian Poulter, Scott Piercy and Russell Henley in a share of the lead at one under, with Jason Dufner (70) a shot back in fifth.
The US Open is billed as golf's toughest test.
Last year's edition was won by Brooks Koepka with a 16-under-par total, and organiser the USGA seemingly made a statement with horrific pin placements at Shinnecock.
Of the 156 players in the field, 29 handed in scores of 80 or worse.
"The pin locations were (at least) on the greens, which was nice," Day joked.
"The wind was strong and with those pins, you can't get it close.
"I'm not complaining; Shinnecock is hard. You've got to hit fairways and I didn't, so that's why I didn't play well."
Marc Leishman and Aaron Baddeley were the leading Australians at four over after they shot 74.
"You just have to play like it's a round with your mates, shoot good a score as you can and ... add it up at the end," Leishman said.
The remainder of the Australian contingent also had a shocker, including Matt Jones (76), Jason Scrivener, Adam Scott (78), David Bransdon and Cameron Smith (79).
Major championship debutant Lucas Herbert shot 83.
Meanwhile, three-time US Open winner Tiger Woods joined the list of high-profile victims.
He racked up a triple-bogey seven on his first hole and never recovered during a 78.
Woods joined Phil Mickelson (77) and Jordan Spieth (78) as multiple major winners with scores high in the 70s, while Rory McIlroy (80) and fellow former US Open winner Martin Kaymer (83) had rounds to forget.
"It was tough out there but I shouldn't be making two doubles and a triple," Woods said.
"Today was the toughest day we will have all week, but if I shoot something in the 60s and (I) will be just fine."
However, worst round of the day went to former British amateur champion Scott Gregory, who suffered through a 22-over 92.
The 23-year-old became the first player in 16 years to shoot 90 or worse at the US Open.