Patrick Reed holds a one-shot lead heading Bryson DeChambeau in the US Open after a chaotic second round in windy conditions at a tricky Winged Foot.
Bryson DeChambeau eagled his final hole to set the target at three under par early on and then watched as many of his challengers crumbled in New York.
But fellow American Patrick Reed birdied the last as he scrambled to four under par.
Overnight leader Justin Thomas fell back with a three-over 73, while Rory McIlroy is seven adrift after a 76.
Thomas started the second round on five under but had four bogeys and a double bogey before a couple of birdies in his closing holes lifted him to two under.
Northern Ireland’s McIlroy, chasing his fifth major and first since 2014, started the day two shots off the lead and birdied the first. But seven bogeys and a double bogey followed as he dropped away to three over par.
World number one Dustin Johnson is also at three over after dropping two shots in his final three holes in a level-par 70.
Former Masters champion Patrick Reed made five bogeys during his level-par 70 on Friday but was continuously able to claw shots back and a birdie at the 557-yard par-five ninth, his 18th, edged the world number 10 into the lead.
“Thursday was soft, benign, the pins were more accessible,” said Patrick Reed, who opened with a four-under 66.
“It’s almost like they set it up to ease us in and then they showed us what it was really going to be like. You had to shoot a low one on Thursday because you knew Friday was going to be brutal.”
Bryson DeChambeau, who signed for a two-under-par 68, was one of only three players to shoot better than par in round two, with fellow American Bubba Watson and Japan’s Hideki Matsuyama carding 69s.
However, 17 players sit within six shots of the lead at the halfway point of the men’s second major of 2020, which was delayed from June because of the coronavirus pandemic.
Follow @sportrazzi12 on Twitter to stay updated with trending sport stories