Spieth, who has only one PGA Tour victory to his name this season, is one of the few players in this week's field to have competitive experience of Erin Hills, having played at the venue in the 2011 US Amateur Championship.
But world number two McIlroy, who arrived in Wisconsin on Friday to survey the course as he chases a fifth major title, was unimpressed on Tuesday after being informed that the fescue was being cut back on certain holes, despite the large fairways. Davis said it blew that hard last Saturday, and conditions were so extreme that play likely would've been suspended had the tournament been going on because balls on the greens wouldn't stay still. "If we can't hit it in that avenue, you may as well pack your bags and go home". Yes, there's a lot of fescue out there, but you've got basically an area of 50-plus-yards wide to drive the ball to keep it out of the fescue.
"I feel pretty good about coming here this week even though 2017 has been a bit of a transitional year for me given what has been happening off the golf course", he said. Then I had more and more people come up to me and say, hey, why aren't you in? "It's a U.S. Open, it's supposed to be a tough test". I don't feel [the rib] at all.
"These are the widest fairways we've ever played in a U.S. Open", he continued.
Westwood uploaded a video to social media showing what appears to be simply the thick rough just off one of the fairways. "I've had a week off in Sweden, and haven't really focused much on golf".
"I teed off a little too on the defensive side, tried to respect the golf course too much and not playing as aggressive as I did", Rahm said.
McIlroy also confirmed he will now participate in next month's Scottish Open at Dundonald as part of his buildup to the Open Championship.
By US Open standards, the fairways here are about 50 per cent wider than the norm according to the USGA's executive director Mike Davis.
"I've always enjoyed that style the most, especially on the big stage of the majors".
The 50-year-old Stricker, a 12-times victor on the PGA Tour who ranked as high as second in the world rankings, has pared down his tournament golf in recent seasons and played just eight events on the PGA Tour this season.
Bjorn has not competed in the US Open since missing the cut at Olympic Club in 2012, but will be an interested spectator when the action gets under way on Thursday.
"I don't think it's a secret that I feel like my driver is one of the biggest weapons in my bag", he said with an air of relish.
"You know you are at event, which is cool". "But I have to be honest: I thought the fescue was a little out of hand in spots".