Wez Blackett: "‏I think Jordan Spieth was born in a pressure cooker. Oozes calm when under stress. #USOpen #bbcgolf."

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Louis Oosthuizen lands a massive shot on 14, his second shot approach skipping merrily into the hole for an birdie three.

After birdies on 12 and 13, that moves him to one under.

This would be a smash-and-grab raid with four holes left, but there is some momentum there.

Branden Grace's tee shot on the 519-yard par-four 14th is a bobby-dazzler leaving him with a wedge shot into the green.

Jordan Spieth's is not a bad shot either.

You would struggle to get a cigarette paper between these two at the moment.

BBC Radio 5 live

Rory McIlroy looked like he might have been on course for something special when he moved to two under on the 13th hole, six under par for his round, but in the end fell away to end the tournament on level par.

The Northern Irishman told BBC 5 live: "I thought I had a great chance to post a number that the guys would have to think about.

"I thought if I could post four under with 16 and 18 to come, they are two good chances to make a couple of shots.

"It just wasn't meant to be, I didn't play the last few holes well all week."

After sinking a monster putt on 13, McIlroy said he was just telling himself to "calm down" as he marched to the 14th tee.

"I didn't want to get ahead of myself at that point, it was just play last few holes as well as I could.

"It's going to take a few days to get over it but when I look back on it I'll be happy about it - a few missed putts will have made the difference."

McIlroy will defend his Open Championship at St Andrews next month and believes he has a "great chance."

"I am really looking forward to the summer coming up.

"Two more links courses to come with the Scottish Open and the Open at St Andrews, playing a fast and firm course like this will only help.

"I'm really happy with where my game is. There is no reason why I shouldn't have a great chance going into the next few weeks."

Jay Townsend
Former American professional golfer on BBC Radio 5 live sports extra

"That's not a good par four at the 12th from Dustin Johnson. That hole sets up perfectly for him."

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Charl Schwartzel is all done. The South African, who won the Masters in 2011, has come home on two under after a final round 66. It is not going to win him the title with Adam Scott already home and hosed on three under, but that is a very decent effort.

Jordan Spieth is straining at the leash.

The American comes within a whisker of a long-distance birdie on 13, the ball rinking round and out.

He has to be content with just the par. But if these start dropping for him, he is the form man in the field.

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Dustin Johnson's birdie putt, bobbles and bumbles its way wide of the trapdoor. Painful. He remains at four under.

Jason Day steps up to see if he can do any better. But these greens are like a rigged fairground game. His putt starts on the right edge and over the space of five feet bends its way wide of the left side.

Dustin Johnson with his second on 12 - a long putt for a hypothetical eagle. It is more about leaving it close enough to make birdie. That'll do.

Six feet from the hole and it is up the hill so any damage will be minimised.

Jason Day will have a similar shot after cosying up even closer.

Dustin Johnson on the tee on the driveable par-four 12th.

He has got a slice of luck pie there, the ball kicking out of the long grass to nestle alongside Jason Day's at the front of the green.

If they make it down in two from there - which is eminently possible - they will have birdies.

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In a twinkle, the cards are thrown up in the air.

On 11, Dustin Johnson drifts a six-foot par putt wide. He drops back to four under.

On the next green, Jordan Spieth and Branden Grace play follow the leader, both tackling the route down off the top deck, to leave their eagle putts very close.

They pat in their birdie putts to move to five under. Johnson has been two over on the back nine in the last two rounds by the way.

Jordan Spieth and Branden Grace have both played very similar approaches into 12. both have a long way to go for an eagle from the top deck. They will need to tread careful on the descent to the hole.

Brandt Snedeker has had an ugly, ugly kick on the 14th green by the way. It practically went up a ramp.

By the way Mike Henson here now after Peter Scrivener's stint on the keys was unceremoniously ended by technology gremlins.

The first creaks and groans are appearing in Dustin Johnson's game. His approach on 11, after a dodgy similar shot on 10, is nowhere near.

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Might Adam Scott's clubhouse three-under be good enough to win? To force his way into a play-off on Monday?

The last playing as a par five rather than the par four it was on Monday might be the factor that counts against him.

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Jordan Spieth and Branden Grace are both left crumpled on the greens by the fine margins.

Both have birdie putts, both stay up after surfing the edge of the hole. Had either dropped down the pipe, their owners would be into a share of the lead.

Iain Carter
BBC golf correspondent on Radio 5 live sports extra

"He aimed too far to the left there and this opens the door to the rest of the field."

Dustin Johnson attempts a rescue operation that the Thunderbirds would be proud of on 10.

He clips out from from a difficult lie to within eight feet but his par putt rolls close but just wide.

A shot gone and his advantage down a slender one stroke.

-6 Dustin Johnson (US) 9 -4: J Spieth (US) 9, B Grace (SA) 9, -3: J Day (Aus) 9, A Scott (Aus) F, -1: C Schwartzel 15, B Snedeker (US) 12; Level R McIlroy (NI) F, C Smith (Aus) 11, S Lowry (Ire) 11

For a full leaderboard, click this way, external.

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We have a new clubhouse leader. Step forward Adam Scott. A stunning six-under 64 and a three-under-par total. Will that be good enough to win?

Dustin Johnson is three clear of that but in trouble on the 10th. He has history of blowing up on the final day of the US Open - he led by three at the start of his final round in 2010 and shot an 82 as Graeme McDowell triumphed.

Jason Day is aiming at the tower behind the 10th green, which is 15 feet left of the pin. "Get lucky, get really lucky," he tells his ball. The television cameraman loses the ball. Day takes a swig of water as he ambles up to the green.

Dustin Johnson does not fare much better. "Uh-oh," he says as his ball disappears off way right.