Justin Thomas makes his first mistake of the day with his first bogey on the card coming on the first hole, which is his 10th of the day.

And again, despite all the talk about how slow and easy these greens are, he's missed from four feet like so many others have done already today.

Matt Fitzpatrick's par run ends, but not in the right way as it's a bogey on the tough 11th - which is playing as the hardest hole on the course so far today.

After finding the bunker off the tee Fitzpatrick does the hard work by flicking a chip out of the sand to about five feet, but he misses the par saver and slips back to two under.

That one will sting.

Nial Foster
BBC Sport NI at Shinnecock Hills

It was the ninth hole, Ben Nevis, that finally slowed Wyndham Clark down.

Just his second bogey of the week came there, before Dustin Johnson trimmed his lead further at the following hole.

Bob MacIntyre shoots 36 for his opening nine holes - three bogeys and two birdies.

Will he find some more birdies?

First to go is leader Wyndham Clark but his solid effort trundles around the lip and stays out.

No such trouble for Dustin Johnson mind, and suddenly the lead is just one shot.

There's a short-game clinic going on over at the 10th as Wyndham Clark, Dustin Johnson and Gary Woodland all clip second shots onto the green and inside 10 feet for birdie.

Be nice to see them cash in.

Justin Thomas teed off on the 10th today and he's reached the turn in a three-under 32 to sit on two under for the tournament and looking strong.

He's obviously feeling good as he gets the furniture out on the first tee and hammers his drive down there to get his back nine under way - and it just clings to the let edge of the fairway after a helpful bounce off the collar.

Jon Rahm is not having a good day. He makes bogey after missing an eight-foot putt.

That's three bogeys in four after being the only player not to make a bogey in round one.

Image source, Getty Images

It's not the best birdie try by Matt Fitzpatrick on the 10th so he remains on three under, but he's now just two shots off the lead.

He's parring Shinnecock Hills to death as well with 10 of them out of 10 holes played - over halfway to a Sir Nick Faldo round.

We mentioned Xander Schauffele a few moments ago and the two-time major champion continues to ascend.

A diamond approach at the 18th (his ninth), a nonchalant birdie putt from six feet and he's into a share of fifth at two under par.

Three birdies in four holes. He's probably tracking for his usual top-five finish here.

Chance for Dustin Johnson to trim Wyndham Clark's lead but he's pulled his six-footer wide of the cup and it's a par at the ninth.

Not that it matters because Clark misses his own shortish putt, this time for par, and drops his first shot of the round.

It'll certainly help the field if he loses his eye on the greens.

We've not really talked about Corey Conners but the Canadian is having a good day today after his country's huge win at the World Cup last night.

He's just rolled in a birdie at the first (his 10th) to grab a share of second place.

Disappointment for Bob MacIntyre at the 17th (his eighth) as he misses from six-and-a-half feet and has to stomach a bogey.

A bit of a momentum killer given the birdie at 15.

Jon Rahm hated his tee shot but redeems himself with an excellent approach to 19 feet.

However, his birdie putt slides past the cup, and he makes matters worse by missing a simple par putt.

Justin Rose does make par, while Jordan Spieth blows up with a double bogey.

A first look at how the course is playing so far in round two as the leader reaches the turn.

Five are under par but only two of those are on the back nine.

Shinnecock still offering a meaty test.

Image source, Getty Images

BOOM. That is a giant drive from Dustin Johnson whose ball has just run and run down the ninth fairway.

He's got it all the way to where patrons are crossing over the hole.

That's 391 yards!

An eighth par in a row for Wyndham Clark who strokes in confidently for par from four feet at the eighth.

He's not pulling away but no-one is making any dents into his lead.

So I said Collin Morikawa was on the best score so far today.

But scrolling down the leaderboard a bit further, I realise that was wrong.

Joaquin Niemann is on -4 after five birdies in his opening six holes.

If he hadn't received that two-shot penalty for chucking a club yesterday, he wouldn't have to be working quite so hard.

It's the top 60 and ties that will make the weekend so at the moment that would be about +2.

If you stick around with us, it will get nervy for a whole host of the world's best a little later.