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Back on seven and Jordan Spieth is a touch aggressive with his birdie putt. That sails six feet by and he tugs the return. Three birdies and three bogeys in his opening seven holes and the Masters champion is back to where he started on five under.

Patrick Reed for bogey and that horseshoes out. Double trouble for the American who is four over through seven and at one over.

A quick flick up to the 18th green to see England's 2013 US Open champion Justin Rose finish his round in fine style with a birdie. That's a two-over-par 72 and a four over total.

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Patrick Reed sets his roller-coaster putt on its way and it pulls up just short of being perfect and then rolls way back down to the right of the seventh green and is almost as far away as when he started. He'll be playing again.

And here he is - bit straighter this one but he doesn't hit it and he's got a four-footer for bogey.

Dutchman Joost Luiten dropped a shot on the seventh, his first bogey of the day after seven pars but he has an immediate chance to make amends on the par-five eighth after hitting the green in two.

Over on the 11th Shane Lowry's lengthy birdie putt doesn't trouble the hole but he's got a tap-in par.

Shane Lowry into the heart of the 11th green with his second, outside birdie chance there.

Dustin Johnson and and Branden Grace are in for pars on seven to stay five under, one behind Jordan Spieth, who fires out of the rough, down the left and onto the green, almost to the pin, 25 feet left. Patrick Reed's effort pulls up short, 50 feet short.

-6 J Speith (US) 6; -5 B Grace (SA) 6, D Johnson (US) 6; -3 S Lowry (Ire) 10, P Reed (US) 6, -2 J Luiten (Ned) 7.

Selected others +4 P Casey (Eng) 13, R McIlroy (NI) F, I Poulter (Eng) F; +5 J Rose (Eng) 74; +7 C Montgomerie (Sco) F, L Donald (Eng) F, L Westwood (Eng); +10 P Mickelson (US) F

For a full leaderboard, click this way, external.

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Up on seven and Branden Grace smashes his ball out of the rough and the ball zips up the hill and on to the green, 30 feet short of the pin. Dustin Johnson from much closer in and from the benefit of the fairway ends up in the same place.

Jordan Spieth and Patrick Reed both cut a little off the corner of the dog-leg right seventh from the tee. Spieth ends up where Grace was but does not get the luck of a decent lie, while Reed is on the short stuff.

Patrick Reed joins the birdie party, knocking in a curling downhill effort on six to get back to three under.

Can Jordan Spieth follow him in? Yes he can. And the young American is our sole leader again on six under.

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Hello. What have we got going on here? Shane Lowry rolling in a birdie putt on the 10th green, to add to his two on the par-three ninth and the big bearded Irishman is two off the lead on three under par.

Of course, I welcome all mums and non parents out there too!

Here's Jordan Spieth in the middle of the sixth fairway and he pulls out of his swing after being distracted by an over-enthusiastic punter in the gallery. He regains his composure and fires pin-high, 15 feet to the right.

Patrick Reed's effort from similar distance is right at the flag but his bounces beyond and is 20 feet left.

Up on the seventh tee Branden Grace booms his drive through the fairway and into the rough but the ball is sitting up.

Evening all. And a very happy father's day to all you dads out there. And what better way to spend the early hours of your day than with the culmination of round three of the US Open?

I join you as we get a three-way tie for the lead and what looked like it might become a Jordan Spieth procession half an hour ago has suddenly become a lot more interesting...

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And Dustin Johnson joins the party at the top of the leaderboard with a birdie at six.

It is him, Jordan Spieth and Branden Grace up the top. Grace salvages par from six to stay in the VIP enclosure as well.

Delicately poised and Peter Scrivener is here to take you through the next instalment.

Jordan Spieth and Patrick Reed have both taken a bit of medicine there. Bogeys for both at five and Spieth drops back alongside Branden Grace at the top of the leaderboard.

Grace himself has a cheeky little approach into six, the ball tracking back like a ball-bearing drawn towards a magnet. He has been in trouble earlier in the the hole though and has some scorecard damage stored up.

He won't be level with Spieth for long.

Football focus presenter Dan Walker on Twitter: "The green on the 4th at #ChambersBay is a complete shambles. Like a municipal pitch & putt #USOpen."

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Patrick Reed's second on the par-four fifth has far too much sauce on it, disappearing out the back of the green.

Jordan Spieth's attempt takes the scenic route, skirting along the edge of the fairway and running up onto an area of trampled grass, That looks like the better spot to me.

Dustin Johnson is still clubbing his tee shots, he has blasted that one out beyond the horizon on six.

Jenna: Is Chambers Bay any worse than Carnoustie was in 1999? #USOpen

Andrew Priestley: I know it's VERY early to be talking about it (but just to throw it out there) could we be witnessing the '2015 Spieth Grand Slam'?

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Branden Grace has been steady as she blows so far today.

Four pars to open up and his first dip into the coloured numbers is a birdie on five, sealed with a two-foot tap.

He is on his own in second place.

BBC Match of the Day presenter and former England striker Gary Lineker: Jordan Spieth is putting the lights out. #USOpen

-6 J Spieth (US); -4 B Grace (SA) D Johnson (US); -3 P Reed (US), J Luiten (Ned), -2 JB Holmes (US), Tony Finau (US).

Selected others +4 P Casey (Eng) 11, R McIlroy (NI) F, I Poulter (Eng) F; +6 J Rose (Eng) 14; +7 C Montgomerie (Sco) F, L Donald (Eng) F, L Westwood (Eng); +10 P Mickelson (US)

For a full leaderboard, click this way, external.

Image source, Reuters

Facing a downhill slope that Franz Klammer might feel a little nervy about, Jordan Spieth three-putts on four to slip back to six under.

But, one under for the day so far and with confidence fuelled by those two birdies, he is in a good place.