Four tied for lead in US Open

In his last 17 starts in majors, No. 1 Johnson has eight top 10s, including his win at Oakmont past year, and just two missed cuts. He missed the 15-footer.

After the Travelers, McIlroy will take a week off and then play in the Irish Open, the Scottish Open and the British Open in consecutive weeks. Five players were two shots off the lead.

The course played much tougher than it did during Thursday's round. He made the turn at 6-under 30, just one off the U.S. Open record of 29 for nine holes. It was 1 over at Medinah in 1990.

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Casey had an action-packed second round.

Koepka, Harman and Fleetwood all shot matching two-under 70s to join Casey at seven under. "It's about raising money for our foundation, and giving back to our area and our community", Stricker said after shooting even-par 72 on Friday to get to 1 over for the tournament. Garcia carded an eagle, three birdies and three bogeys in a roller coaster round.

World number one Dustin Johnson said he plans to take some time off with his family as he struggles to digest his US Open flop.

As for why Johnson, McIlroy and Day struggled, one possible reason is that all have battled injuries or personal situations over the first half of the season that may have kept them from being tournament-ready.

Day, who won the 2015 PGA Championship up the road at Whistling Straits, had to birdie his last hole Thursday to break 80.

Rickie Fowler, Jamie Lovemark and J.B. Holmes were all one shot back, followed by a group of five at 5 under, including amateur Cameron Champ.

"It was a good display, all my own fault, of what can happen if you get out of position on this golf course".

McIlroy dismissed the notion of being rusty before the tournament, but conceded on his way out of Wisconsin that he hasn't played almost enough.

McIlroy is headed for the Travelers Championship next week in CT, and he has three straight tournaments starting with the Irish Open through the British Open. PGA Tour rookie Xander Schauffele didn't make a bogey at Erin Hills until his 27th hole, had his hiccup with a double bogey on the par-3 13th hole but still managed a 73.

Defending champion Johnson will aim to bounce back from a lacklustre three-over-par 75 when he tees off alongside Jordan Spieth and Martin Kaymer in the afternoon session.

He tugged a 3-wood into the rough at the par-4 11 that led to bogey, then three-putted his next two holes.

After a record number of scores under par during Round 1, anyone who knows the USGA's style knew things wouldn't be quite as simple in Round 2.

"I think when you're trying to aim at a target usually at a normal golf course, with normal-width fairways, there's some pressure into hitting the fairway because it is a lot narrower than we have out here", Day said. "There's no secret that I'm very fiery and a competitor and I've let my emotions get the best of me for sure so I'm understanding that if I can control those I certainly have a better chance of playing well". Still, the USGA reacted to Thursday's unusually low scores by placing the pins in more hard locations Friday, seemingly finding the areas where there is a little more break on what are generally flat greens.



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