OVERNIGHT leader Rickie Fowler has slipped off the pace in the second round of the US Open, with four players now sharing the lead. It might sting a little more for McIlroy (+5) and Day (+10), who played in the same group and said after their round that they were consoling each other along the way.
Undaunted, Fowler responded with a mammoth 51-foot putt for birdie on the eighth to reclaim a share of the lead.
Casey made a snowman - a triple-bogey 8 on the par-5 14th - and still broke par with a 71.
Casey, who had shot a six-under-par 66 on Thursday, came unstuck with a disastrous triple-bogey eight on the 14th after teeing off on the 10th hole.
He was not the only big name to miss the cut as Rory McIlroy and Jason Day, world number two and three respectively, also crashed out.
But after two wayward rounds and a missed cut, defending champion Johnson was heading home on Friday resigned to watching the climax of the tournament on TV. Johnson capped off this collective failure with a late collapse on the back nine at Erin Hills, making three bogeys over a five-hole stretch and closing with 73 that left him 4 over. "It was a bit of a roller coaster", said Casey.
The 2011 champion McIlroy shot a second round 71 but his horror opening score of five-over on day one means his uncertain season continues as he missed the one-over cut line; the joint-highest in US Open history.
"I've been very light on competitive rounds", McIlroy said.
"I'm definitely disappointed I'm not playing the weekend, but there is a lot I can take out of it".
Lowry's front nine nearly saw the Esker Hills golfer play his way out of the tournament as he posted four bogeys with just the one shot gained.
"It was a good bogey though", joked Fleetwood, who regained his composure to hit a superb pitch from well below the putting surface. Every time I've been in majors so far I've put so much emphasis on them and tried so hard at them that I kind of got in my way.
Paul Casey declared himself satisfied with a "roller-coaster" second round at the U.S. Open, which saw him break par despite dropping five shots in four holes on his first nine. "I think at this point in time I just need to play".
He then bogeyed the 15th hole, hitting it short of the green in two and failing to get up and down. Hit a lot of shots probably better today than I did yesterday.
"As good as I got", he told Spieth, smiling as he walked with him down the fairway.
"If we get rain tomorrow and it gets wet and it plays soft, this place is going to get soft and you're going to have to be aggressive and you have to make a ton of birdies", Snedeker said.
Left behind was the biggest 36-hole logjam in 43 years at the U.S. Open, with four tied at the top.
Four-way tie for lead, top-3 MC at US Open
His total of 154 equaled his worse two-round total at a major, matching his first two rounds at The Open in 2013. Corey Conners, of Listowel, Ont., shot his second straight 76 to finish at eight-over par and miss the cut.
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Koepka became the third straight American to win the title. "After that, it was kind of lights out", Harman said. Harman dropped back on the back nine after going bogey-free on the final nine holes over his first three rounds.