Tiger is furious. All sorts of angry grunts and groans on the tee box at six.

His approach at the par three has gone AWOL.

Welcome to the party Tyrrell. The Englishman is starting to enjoy himself but, unfortunately for him, it's almost home time. And the rest of the Bellerive guests have plenty of time to carry on partying.

A pearler of a third shot on the par-five 17th leaves a tap-in for birdie. He's up to nine under alongside Day, Scott and Fowler.

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-12 B Koepka (4)

-11 J Thomas (7)

-10 T Woods (5)

Selected Others

-9 T Hatton (17) J Day (6) R Fowler (4) A Scott (3)

-8 S Lowry (7) J Rahm (4) J Rose (13)

-7 G Woodland (5)

-6 D Johnson (14) M Wallace (11)

Uh oh, hang on...

Brooks Koepka trickles his long-range birdie putt at the fourth up towards the hole, but watches it screech to a halt a little early. Easy par from here in the form he's in, surely?

No! The leader miscues, his par putt stays up and instead Koepka taps in for his first bogey of the day.

The lead becomes one.

No problem for Jason Day. The 2015 champion confidently uses his brush to sweep home that birdie putt on the par-three sixth, moving him alongside compatriot Adam Scott and Rickie Fowler.

Oh wait... there is also another player who has bolted into that group. One English fans will be interested in...

Fantastic par-save from Tiger Woods. He chips on to the green from that gully between bunkers and lands his effort within a very gettable par putt of the cup. Get it he does, and Bellerive goes bonkers...

Justin Thomas is in the building!

A great start for the world number two gets even better as he rolls in for a third birdie of the day at the seventh.

And with all the focus on Woods and Koepka, the defending champion can quietly go about his business, sort of... he's two strokes off the lead.

Funny how quickly things change in golf. Stewart Cink birdied the third but back-to-back bogeys see drop down the leaderboard. Playing partner Jason Day also bogeys the fifth but then nails his tee shot on the sixth to give himself a chance of clawing that straight back...

Outrageous power from Brooks Koepka to thump an approach out of the rough and up on to the front of the green. Can two-putt for par from there.

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Jon Rahm is one player not managing to take advantage on the front nine. In fact, the beefy Spaniard has just lost a shot on the long par-four fourth. He's scrambling for a par with a long putt from the back of the putting surface and can't make it.

Playing partner Fowler churns out another par to stay within touching distance of the lead.

Well, the luck's in for Tiger with that lie. A nice bit of downtrodden grass where spectators stood a few moments before his drive found its way in.

"Back it up, guys," he tells those standing around, phones at the ready.

Nine iron for Woods. 180-ish yards to the pin. He goes straight at the flag, but leaves it short and it drops into a bunker guarding the green. Nope, a spot of rough just besides it...

Those fans scuttle in behind their man, smart phones still in hand, getting a nice close up shot of his red shirt - and not much else.

Some serious whip on that Brooks Koepka drive, like an 18th century grammar school teacher cracking the cane.

It jumps up on to the slightly longer cut.

Rafa Cabrera Bello and Tyrrell Hatton are having a ball out there. Ten birdies evenly spread between them and not a hint of a blob on their cards.

The birdie train has slowed down as they head back home, perhaps an indication that the front nine remains the place for the leaders to do their damage.

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A long-range putt for Brooks Koepka if he wants to extend that lead, having left his tee shot at the par-three third on the outer reaches of the green.

The US Open champion just slides it up to within a few feet, and then tickles it in for par.

Those fans following Tiger Woods are in full voice - a nice array of hat wear on show, camping chairs, the whole works. The American gets one woman out of her seat as he pings his drive in her direction at the fifth, before it swerves off slightly towards a line of fans that's five, six deep.

It clears them. Now where's that gone?

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Rory McIlroy looking for one final flurry on the last... he dinks in his third shot from just off the front of the green... clanging into the flagstick and popping off to seven feet away.

He pushes that left and has to settle for a bogey five.

Not been the Northern Irishman's week as his barren run at the majors - now stretching a full four years - continues. Level par for the day, two under for the tournament.

Spin masterclass from Tiger Woods, who found himself in a spot of bother after sticking his tee shot in the sand. Back on the fairway, he clips an approach just beyond the pin and watches it scurry back towards the flag like he's reeling in a yo-yo. Great control.

He's got about five feet for par...a confident putt, straight in the middle and he strides off to the fifth tee with cheers ringing in his ears.

Long, outside chance of a birdie for Brooks Koepka at the second, but the big-hitting American doesn't get enough on it and his putt comes up several feet short of its intended target. No bother, he rolls in for par under pressure to maintain that lead.