Jordan Spieth finds the green with his second shot but trundles his birdie putt past the hole. In for par and at +4 he'll still be dreaming.

Here's Graeme McDowell from eight feet. For bogey. Not sure how he's ended up taking three from the centre of the fairway with just a wedge in hand but he's missed that and opens with a double. Back to +6. Any thoughts he had have gone.

Image source, Getty Images

Amateur Jon Rahm is ripping up the front nine. Four birdies in five holes for the Spaniard who is up to four over.

Rahm gets giddy on the seventh though and leaks his approach to the green right and into the sand.

I wonder if Shane Lowry is keeping tabs? Or has the Irishman been watching his home county Offaly lose their Leinster hurling semi-final against Galway.

The first hole has been playing well above its par all week. But here's another birdie, Louis Oosthuizen rolling in to get to three over. the South African led from the front when he won his solitary major, the 2010 Open at St Andrews. 

Can he come from 11 back? It's a big ask.

"Please welcome, from Northern Ireland, the 2010 US Open champion Graeme McDowell." A smattering of applause. He sets the ball down the right and it bends back slightly to end perfectly placed on the fairway.

"From Dallas, Texas, the 2015 US Open champion Jordan Spieth." A bigger round of applause. Driver out, skipping down the left side of the fairway. Easy game this golf.

Image source, Getty Images

I think Hunter Mahan wins the prize for the best Father's Day gift.

John Fitzmaurice: Best advice I was given was to concentrate on hitting the back of the ball really hard. 8 handicapper.

We want to know the best/worst gifts you bought your dad for Father's day. Or maybe you have been bought some? And what's the best/worst fatherly advice you've had on a golf course?Tweet #bbcgolf., external

Masters champion Danny Willett is having a real bag of Revels today. He started on eight over but double bogeys on three and five dropped him to +12. He's hit back with birdies on six and seven.

Out on the 18th green tournament officials are discussing where to put the pin. There's all manner of mini flags dotted around and tape measures, people hitting balls across slopes.

It's going back right at the top of a little slope but there is a helpful hill at the back of the green in case the adrenaline is flowing and you go long.

England's Ian Poulter is out injured at the moment, so not at Oakmont this week. I'm sure his dad wouldn't mind a late Father's Day gift on Sunday 2 October.

Sweden's David Lingmerth is following Marc Leishman's lead with birdies on one and two to get to four over.

Jordan Spieth is out with the driver on the range. A couple of final swings before he heads over to the first tee. 

Even if the defending champion equals the course record, the 63 scored by Johnny Miller in coming from six back to win the 1973 title, he will still only get to three under. He needs a big blow up from those out front.

What do you do the evening before a big Euro 2016 group game? Focus in on the golf of course. I wonder if manager Roy Hodgson is allowing the England boys to stay up late tonight?

That's better, although Bubba Watson won't be agreeing with me. The left-hander flies through the back of the third green and his ball slips down a huge slope. 

His first attempt up the hill stalls on the crest and there's only one place that ball is heading...back to his feet. Bubba wastes no time and gives his ball a bigger smack. Much better result and a chance of a three-putt but he's missed and that is a costly triple bogey seven.

The players are out in force with tweets and instagram messages to their fathers, or from their own children. We'll bring you a selection as the round progresses.

Here's a beautiful montage from the daddy of them all. 

It's birdie city out there at the moment. Come on Oakmont, show us your teeth. 

The only amateur to make the cut, Spain's Jon Rahm sinks successive putts on the second and third to get to six over.

Australia's Marc Leishman has birdied the first three holes to get to four over. Of the 29 to complete a hole, nine are currently under par.

Have the USGA set up the course for a big shoot-out, rather than the round of attrition we are all used to?

That's a big cookie Bubba, or a very small card.

Mike Collins: On dog leg dad gave quick tuition on how to fade to take out trees & get max distance. Resulting shot led to career in forestry.

We want to know the best/worst gifts you bought your dad for Father's day. Or maybe you have been bought some? And what's the best/worst fatherly advice you've had on a golf course?

Tweet #bbcgolf., external

Image source, Getty Images

I digress. Back to the action. Big-hitting Bubba is out on the course with his pink-headed driver, smashing a big banana bender down to the fringe on the par-four second. A chip up and Watson has got a look at a birdie putt to get back to six over. In she pops and he strides purposefully off to the third.

The double Masters champion was one under after round one but dropped away with a six-over 76 in round two.

So, what do you know about our leader Shane Lowry? He's Irish. He's 29.

He won his first European Tour title, the Irish Open, in 2009 as an amateur. He finished tied for ninth at last year's US Open.

He has one PGA Tour victory, at the 2015 World Golf Championships-Bridgestone Invitational. 

He's from a town called Clara, County Offaly in the centre of the Republic of Ireland.

But everyone knows that. Here's the fact to blow the minds of your mates...his home town has a world renowned peat bog, called, surprisingly enough Clara Bog., external

It's so important it has had a poem written about it:

In morning's youth I look across this land

so fresh and quiet 

and all my senses full enjoy

this beauty bogland sight.

- On Clara Bog by Drigin Gaffey

The BBC - here to inform, educate and entertain.

Image source, Getty Images

Justin Ray from the Golf Channel has just blown us away. Shane Lowry, your name is on the trophy....

A lesson for all of us here. World number two and defending champion Jordan Spieth is on the practice green already. He doesn't tee off until 18:10 BST. That's more than an hour away. He has a stick laid out on the green and is focused on pushing the putter through in a straight line.

Hands up who rocks up 10 minutes before tee-time, has a couple of swings with the big dog and then hooks the opening tee shot out of bounds?

Spieth will start at +4 and play alongside Northern Ireland's 2010 US Open champion Graeme McDowell.

BBC Radio 5 Live

Let's get your card marked if you don't mind. There are no prizes at this scoring hut for shoddy time keeping.

At 20:00 BST you can listen to live coverage from Oakmont on BBC Radio 5 live sports extra.

Then from 22:00 BST, the big dog comes out, you'll have to switch on to 5 live.

Iain Carter will commentate in his usual expert way, Jay Townsend provides the analysis.