While Dustin Johnson is going for birdie, Brooks Koepka has got a very tricky two-putt for par on the ninth.

His second shot has just landed way left of the hole. Interesting...

"What a golf shot that is."

Bit of sarcasm from Matt Wallace as his second shot lands on the bottom-left of the green on the 11th.

Another birdie chance for Dustin Johnson? He had a huge drive, which carried a little over 320 yards, on the 10th and his second shot has landed around a dozen feet from the flag.

Rory McIlroy, speaking to Sky Sports, after a one-under 69 to finish on one over: "I'm proud of myself, I didn't let my head drop and I tried to the very end.

"Today was a nice way to finish. It was a really hard day to putt because of the wind, so there was a little less expectation. I just sort of let it go."

On Brooks Koepka's form, he added: "It's awesome, he gets into a different mindset at the majors, for whatever reason that is. The conditions are playing into his hands, it will be hard for anyone to go low and catch him."

Image source, Getty Images

A new tee is 40 yards back and, with an added fairway bunker, most approach shots will be played from a severely sloping lie to a green that is mostly blind.

Brooks Koepka isn't bothered about all the cheering or commotion up in front of him.

He's just going about his business with the look of a man who knows it's all in his hands.

It's exemplary stuff at the moment, as he goes from tee to green on eight and takes two-putts to finish off.

It's a bit of catch me if you can.

Matt Wallace can't quite compete with Dustin Johnson's mammoth drive but it's still a respectable 270 yards for him straight down the 11th.

Rory McIlroy's weekend is over as he cards a 69.

A decent conclusion to a disappointing tournament? He's been well back throughout but has shown glimpses he isn't that far away.

All in all pretty frustrating.

Anthony Wall
Two-time European Tour winner on BBC Radio 5 live

It's probably the first time the lead has been down to four since Friday.

Dustin Johnson looks a lot more interested now than he did back then too. His stroll down the fairway has become more of a trot.

Brooks Koepka is doing well playing par golf but he has to be mindful of who is chasing him.

Wowsers. That's golf from another planet from Dustin Johnson, who lands his second from about 160 yards to about two-feet from the pin on nine.

He rolls in for Birdie. Lead down to four. Game on.

After pars on all of the front nine holes, Jordan Spieth has his first birdie of the round on 10 to move to four under.

He then saves par on 11 from about 18 feet and punches the air. This is looking solid. Brooks Koepka might be out of reach, but a top three finish is very possible. He's now fifth.

Matt Wallace went from bunker to bunker on the 10th, but he plays it beautifully from there and is a couple of feet from the hole. It's an easy par in the end.

Image source, Getty Images

The green now comes right up to the pond at the front and the yardage could vary on a daily basis. Anything coming up short is almost certain to roll back into the water.

Brooks Koepka is running along serenely.

He's putting from a different postcode on the seventh but he judges it to perfection to give himself a tap-in for par.

His fifth in six holes.

This is mature play from Jazz Janewattananond. It's another solid tee shot from the 23-year-old. He lands around 30ft from the hole on the par-three eighth.

Is the momentum with Dustin Johnson? Horrendous off the tee, deft chip, lovely touch on the green, equals par saved.

A big moment perhaps?

Painfully close for Matt Wallace!

It was a 35ft uphill putt and ends up a whisker right of the hole. He looks to the sky. I felt that one Matt. The Englishman gets a par.

Another par, another fist pump from Jazz Janewattananond.

He sinks a 14ft putt on the seventh.

Where's Dustin Johnson gone at eight?

The pin is tucked away to the right today but I'm not sure that's worked out.

His ball appears to be gobbled up by a tree, just right of the green before dropping out of a branch and nestling in the semi-rough. It could have been worse, he could've been swimming.