Rory McIlroy will begin his second US Open round at 6.25pm Irish time on Friday.
The Hollywood native carded a three-under-par 67 at Brookline to share second place with England’s Callum Tarren, David Lingmerth, Joel Dahmen and MJ Daffue, a shot behind Canada’s Adam Hadwin.
Shane Lowry and Seamus Power are both further back, with the latter one over and Lowry two over.
Lowry's round is scheduled to start at 1.02pm on the tenth hole, with Power on the same hole 21 minutes earlier.
A month after an opening 65 in the US PGA, it was another welcome good start to a major for McIlroy after previous struggles, but it was not without incident as he slammed one club into a bunker and threw another down the fairway on his final hole.
After starting from the 10th, McIlroy had covered his first 13 holes in two under par before a pushed tee shot on the fifth finished in thick rough on the edge of a bunker and left him struggling to take a stance in the sand, with the ball well above his feet.
From there McIlroy could only hack his second shot into another bunker a few yards in front of him, prompting a furious reaction which saw him twice slam his club into the sand.
“You’re going to encounter things at a US Open that you just don’t really encounter any other week,” said McIlroy, whose mood was not helped by the slow pace of the group in front of himself, Hideki Matsuyama and Xander Schauffele.
“It’s hard not to get frustrated because I’m walking up there going like, just come back into the bunker. The thickest rough on the course is around the edges of the bunkers.
“So I was sort of cursing the USGA whenever I was going up to the ball, but it’s one of those things. It happens here, it doesn’t really happen anywhere else. You just have to accept it.
“I gave the sand a couple of whacks because I’d already messed it up, so it wasn’t like it was much more work for Harry (Diamond, his caddie), and then I just reset and played a decent bunker shot, and then it was really nice to hole that (par) putt.”
Having saved par at the fifth, McIlroy birdied the seventh and eighth to take the outright lead, only to drop his only shot of the day on the ninth after missing the green with his approach.
That prompted the club throw and McIlroy added: “The margins are just so fine in this tournament, and I think you can sort of see that out there with some of the reactions.
“Once I played our front nine in two under, the goal was to try to play this round without a bogey. I did that for 17 holes, which was great, and then I was sort of in two minds about what shot to hit on the second shot on nine and missed the green where you just can’t miss it.
“I didn’t do that all day. If I missed it, I missed it in the right spot, played for the fat part of the greens, and that’s why I was frustrated, because you miss it left, it’s a pretty simple up and down. You make par, you move on.
“But it’s fine. It’s something to learn from. (I’m) sitting here talking about the bad stuff when 17 of the holes were really good. I’m happy with the start.”
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