Big-hitting Bryson DeChambeau set a testing clubhouse target on day two of the US Open as Winged Foot belatedly began to justify its fearsome reputation in blustery conditions in New York
A total of 21 players broke par in the first round in sharp contrast to the last time the course hosted the championship in 2006, when Colin Montgomerie's opening 69 was the only sub-par score.
DeChambeau had carded a 69 on Thursday and defied tougher conditions to go one better in round two, completing a 68 in brilliant style with an eagle from six feet on the ninth, his closing hole.
"I feel like I drove it pretty well considering the windy conditions," said DeChambeau.
"It's super tough to hit fairways here but I did it when I needed it most and was able to capitalise when I hit it in the fairway."
On three under par, the big-hitting American held a one-shot lead over Spain's Rafa Cabrera Bello.
World No.3 Justin Thomas, who held the overnight lead on five under, was among the later starters.
Cabrera Bello birdied three of his last four holes in a second round of 70 and said: "It's a tournament I do like. I tend to be a grinder, as well. I never give up. I keep fighting.
"I have played some great rounds in the US Open, at Pebble Beach, at Shinnecock (Hills) as well. I've been not quite able to finish as high up as I would have liked to, but I mean, it is different.
"Definitely it's a major that tests your patience beyond limits and your mental strength as well, to accept the fact that you're going to hit some great shots and going to end up making bogeys, and you just have to accept that sometimes two or three bogeys in a row is not as bad as it looks."
World No.1 Dustin Johnson finished the round at even par with two birdies and two bogies.
Johnson is three over par and tied for 41st through the second round.
Lee Westwood had also far from given up on his bid for a first major title at the 83rd attempt, despite following his opening 67 with a 76 on Friday.
The 47-year-old former world No.1 bogeyed the first, second and sixth before stopping the rot with a birdie on the par-five ninth, which played as the easiest hole on the course on day one.
Westwood began the back nine with a run of six straight pars, but then double bogeyed the 16th and dropped further shots on the last two holes.
Belgium's Thomas Pieters, who was in the second group out, had earlier made a flying start to briefly move into the outright lead.
The former Ryder Cup star, who won a record four points on his debut at Hazeltine in 2016, birdied the first and fifth to improve to six under par, only to cover the back nine in 41 to return a 74 and finish level par.
Australian Associated Press