Two birdies in a row for Collin Morikawa on 15 and 16 and all of a sudden he's into a share of second spot trying to chase down Wyndham Clark.

He's tallied seven birdies and just one bogey so far today, and he's four under for his last eight holes and six under for the day.

Two pars to finish will see him equal Clark's 64 from the first round.

The 15th hole picked Dustin Johnson up, chewed him up and then spat him out.

A dreaded eight on the scorecard for a man who had been playing so well up until about four holes ago.

At +4, he's suddenly going to be flirting with the cut line.

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Meanwhile, Wyndham Clark is inches away from pocketing another birdie as his effort grazes the cup.

Remember, at the 11th tee, he was one shot ahead of Dustin Johnson. Par for the leader though and three holes to go.

Talk about a game of two halves, or a tournament of two rounds - Bryson DeChambeau ranked fourth in the entire field in putting in the first round, gaining 3.43 shots.

Today he's -2.64 shots in the putting stats which leaves him in 73rd - out of 77 who've teed off so far today...

A polite smattering of applause for Dustin Johnson as he chips it back onto the green.

But he's got 23 feet to limit the damage to just a triple bogey.

Another player potentially throwing himself out of the tournament is Dustin Johnson.

He's having a nightmare in the greenside bunker to the left of the 14th.

First, he's tried to get out and it's rolled back in.

Then, he's thinned it totally and it flies over the putting surface.

All falling apart.

Another bogey for Bryson DeChambeau as he drops to five over, which as it stands right now is three shots outside the cut mark.

That mark could well drop later on if conditions remain tough but it'll mean a nervy wait for the 2020 and 2024 US Open champion unless he can pick up a shot or two down the stretch.

Again it's the putter doing all the damage, as he three putts from 40 feet, leaving his first seven feet short and then missing that for par.

Typically, Wyndham Clark's drive was so far wide that it's landed in the area that's been trampled down by spectators and he's got a terrific lie.

Once again he can take aim at the green. Once again he finds the heart of it.

Lucky break for the leader.

US Open specialist Xander Schauffele is best placed to stop Wyndham Clark sprinting off into the distance.

Schauffele has reached the par-five fifth and uncorks a beauty 337 yards down the fairway.

The two-time major winner has eight under-par rounds at the US Open since 2020 and has improved his score by four today.

His run of nine straight top-15 finishes in this championship includes a tie for sixth here in 2018, so he knows how to work his way around this challenging layout.

Jon Rahm overshoots his approach shot and nearly saves par, but his 19-foot putt comes up just short.

It's another bogey for the Spaniard.

Meanwhile, Jordan Spieth sits at five over par and is currently two shots outside the cut line.

Another strange drive from Wyndham Clark, this time at the 15th and again he's in the undergrowth.

If the past two holes are anything to go by, birdie chance incoming.

Not this time for Wyndham Clark as he can't convert from 12-and-a-half feet. Easy par though in the end.

Kudos too for Gary Woodland as he splashes out of the sand and is so on target his ball hits the bottom of the flagstick and stops dead. Excellent par.

Two poor drives. Two deep crunches out of the undergrowth.

And two safely on the green.

That's the impressive story of Wyndham Clark over his past two holes, and once again he's going to have a lengthy birdie opportunity. Gutsy.

Wow! That's a big break for Matt Fitzpatrick, who holes out from the rough around the 14th green to salvage his par - and likely save himself two shots.

It's a stinker of a spot to leave himself in, as it's pretty juicy rough but he's chipping on to a big slop down towards the hole so there's a ton of jeopardy in it.

He digs it out about as well as you could expect but it's racing down the hill and would've gone flying by had it not bumped into the flagstick and dropped into the hole.

Big bonus!

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Booming drive from Dustin Johnson at the 14th, in contrast to Wyndham Clark bumping it into the fescue once again off the tee.

Another bogey at the past hole means DJ has gone from one shot off the lead to seven behind in the space of three holes.

It's been a bruising run for the 2016 champion.

Justin Rose is once again unhappy despite finding the green safely.

You can tell he knows the birdie opportunities are there and wants to give himself a better look at one.

Jon Rahm throws his arms into the air after hitting his tee shot to 12 feet.

Two contrasting reactions, but neither player can make the birdie. Rahm's putt lips out, so close...

Collin Morikawa is just consolidating right now on the back nine with four straight pars after those two birdies around the turn lifted him up to one under and right now that's good enough for a tie for fourth.

That's good enough right now for the two-time major champion.

Wyndham Clark had a five-shot lead for about a minute by my reckoning as on the other side of the course Xander Schauffele has just slotted in a 17-foot birdie of his own.

Into solo second at three under.

Huge!

What a putt from Wyndham Clark - and nobody would have called that after he was in the jungle off the tee.

His reaction to that 30-footer for birdie? A big fist-pump.

He's feeling it.

Bob Macintyre walks away with bogey after missing a putt from 15 feet - he left himself too much to do.

Back to one over.