Following that impressive birdie start, Max Greyserman is brought right back down to earth again with a bogey on the second.

He follows a wayward approach shot by overcooking a chip from the rough on to the green meaning he has to two putt.

Australia's Min Woo Lee a lot more steady as he nudges in the second of two pars.

Rory McIlroy has reached the difficult 208-yard par-three 17th.

With the wind really starting to blow, he decides to take an aggressive line at the pin, but it comes up short and looks to have plugged in the bunker.

Oh dear.

Max Greyserman begins his third round with a birdie to grab a share of the lead.

He hits the fairway with his tee shot, finds the green 10 feet from the cup and duly rolls a putt into the hole. He points to the crowd to acknowledge the applause.

Easy as you like.

Speaking to BBC Sport Northern Ireland's Stephen Watson, Shane Lowry says Aronimink is a "great course but has been set up pretty poorly".

Watch what the Irishman had to say below.

Rory McIlroy hangs his drive at the par-five 16th out to the right and it looks to have nestled down in some deep rough.

From 214 yards, he catches a huge flier and his ball skips up the green and rolls off the surface, long and right.

He has plenty of green to work with but a big slope between his ball and the flag, so he goes for the big flop.

It's a tad strong and he has 11 feet back up the hill for birdie. No, that was never high enough and that's a frustrating five.

Aaron Rai's progress was checked slightly with a bogey on the fourth but he makes amends on the sixth, playing a wonderful shot out of the fairway bunker to run up to six feet.

He dispatches the putt and is back at two under for the day.

Image source, Getty Images

Don't be surprised if these two go low today. Former Masters champion Hideki Matsuyama shot 67 yesterday but up-and-coming American Chris Gotterup shot 65!

You may not know much about Gotterup but he's become a serial winner - including last year's Scottish Open where he held off Rory McIlroy, and then followed up by finishing third at The Open at Portrush.

And he's won twice more already this year, the second of which came at the WM Phoenix Open in a play-off against, guess who? Yep, Matsuyama. Small world!

Alex Smalley and Maverick McNealy are in pretty unfamiliar territory at present with just one PGA Tour win between them.

Neither have finished inside the top 10 at a major and while Smalley, has hus mum tracking every round he plays, having previously acted as his caddie, McNealy is a licensed pilot.

Albeit the 30-year-old's first name did not originate from the 'Top Gun' movies but rather a model of car.

After an ugly three-putt on the second Cam Young has an immediate chance to bounce back on the third with a mid-distance putt for birdie.

JT on the other hand has zipped into four feet and looks keen to get a shift on up the leaderboard.

At 18:55, we highlighted the fact that Rory McIlroy was tied for 104th after his first round.

And what about this for a stat:

Only four players in history have won a major championship after being ranked 50th or worse on the leaderboard at the end of the first round:

Steve Jones, 1996 U.S. Open, T-84 after R1

Payne Stewart, 1989 US PGA Championship, T-77 after R1

Mark O'Meara, 1998 Open Championship, T-62 after R1

John Mahaffey, 1978 US PGA Championship, T-59 after R1

Scottie Scheffler has an outside chance of a birdie but has to settle for another par - which David Puig would happily have signed for as he makes his second successive bogey followed a huge wide off the tee.

That's a really good par save by Jon Rahm after making a bit of a mess of the seventh, missing the fairway and the green but then chipping to 12 feet and making the clutch putt - as they call it these days.

After four birdies - and a bogey - on the first nine holes for Xander Schauffele it's been a little bit of a quieter start to the back nine.

The American collected a birdie on the 11th but it's been three pars since then.

Playing partner Rickie Fowler rolls in a nine-foot putt at the 14th to move to one under for the tournament.

Rory McIlroy's ball runs out of room down the left-hand side of the fairway on the beastly par-four 15th, which is playing 551 yards today.

He has a thick lie from 220 yards and can only muscle it out to around 40 yards short of the green and now he's scrapping to make par.

His chip on to the green is only slightly above average, leaving him a crucial 12-footer for par. Makes it!

Big.

Par-five coming up.

Image source, Getty Images

Aldrich Potgieter has shown fearlessness of youth in his opening two rounds, but the 21-year-old South African has also been composed when required.

Germany's Stephan Jaeger made pars on all 18 holes in his second round and might need to show a little bit more than just consistency on moving day.

Both players very much in the mix at Aronimink, but how will they hold up when the pressure starts to increase?

Justin Thomas absolutely hammers a putt from 27 feet and is a tad fortunate that it catches the hole and pulls up. Another inch right and it might have cleared the putting surface.

As it is it is a par start for the American and his playing partner Cameron Young, whose own birdie attempt was a smidgen out.

Image source, Getty Images

Min Woo Lee and Max Greyserman have both just hit the fairway with their tee shots at the first.

Greyserman has been quietly methodical in the opening two rounds while Min will be keen to iron out a few errors to help keep him up the top of the leaderboad.

Both players are three under.

Big opportunity missed by Jon Rahm at the short sixth after a superb drive left him just short of the green.

The wedge is OK, to 11 feet, but not as close as he'd have liked and he fails to get the birdie putt to drop.

Image source, Getty Images

Justin Rose speaking after signing for a five-under 65:

"Played well. Got off to a good start, which is kind of exactly what I felt like I needed to do today. I thought it was some beautiful conditions this morning. Put the ball in play off the tee, which I wasn't able to do for the first two days.

"Yeah, kind of hit some really beautiful iron shots into some pins, worked the ball nicely into right flag, left flag.

"So, yeah, I was really happy with the way I kind of adjusted overnight and worked on a couple of things on the range before I went out to play today, just adjusted a couple of things. It was good to see that pay off so quickly."

On whether the course is playing much different compared to the first two days:

"Not markedly different. I think just sort of subtly different. That probably makes a big difference. I think we've seen a lot of pins on crowns and edges.

"The first hole, actually, the pin was way back on a crown, so I kind of felt like, oh, it's going to be much of the same kind of thing.

"I felt like think the pins are just a bit more predictable. The reason, I think when the pins get off of those little knobs and crowns, they're not so much easier to get at, but they're easier to putt at."

It's a second par for Scottie Scheffler but a much different one to the first as this time he needed to hole a 10 footer for his four, which he managed.

Just a hole after missing a four footer for birdie, funny old game!