Postpublished at 00:41 British Summer Time 19 June 2017
Koepka (-16 after 16)
He doesn't need to go pin chasing but Koepka can't resist taking on this lengthy birdie attempt at 17.
Oo-er, he's hit it long though. A tricky five or six-footer for par.
Champion: -16 Brooks Koepka
-12 Brian Harman, Hideki Matsuyama
-11 England's Tommy Fleetwood
BBC Radio 5 live sports extra: 21:30-01:00 BST
Jack Skelton and Luke Reddy
Koepka (-16 after 16)
He doesn't need to go pin chasing but Koepka can't resist taking on this lengthy birdie attempt at 17.
Oo-er, he's hit it long though. A tricky five or six-footer for par.
Harman (-13 after 16)
Brian Harman is 13 under. He needs a birdie and an eagle to haul himself level. He is not a big hitter so that will not happen.
Hoffman (-9) Harman (-12 after 15)
Brian Harman laughing at 184 yards of challenge on 16 as his tee shot lands the length of a banana from the cup. That will be a birdie.
Up on 18 Charley Hoffman celebrates like he's won the US Open as he drains a par putt from off the dancefloor. Hoffman threw his putter in celebration, milked the crowd and then launched his ball into the galleries. Imagine what he'd have done had he won this tournament. He mixed it at the top in a couple of spells but fell away, as he tends to do...
Fleetwood (-11 after 16), Koepka (-16 after 16)
Excellent stuff from Fleetwood, firing his second at 17 to within 20ft of the hole.
He could still grab second-place here.
Koepka hits the heart of the green. Of course. No need to go pin chasing now.
Koepka (-16 after 16)
He's not just trophy hunting, he's record hunting too...
One more birdie for this man will bring up 17 under and that would be a US Open record.
Fleetwood (-11 after 16), Koepka (-16 after 16)
Koepka goes right off the tee but he's safely on the fairway at 17. Fleetwood does the same.
Harman (-12 after 14)
Brian Harman is the only threat to Brooks Koepka now and that threat is hardly the stuff of nightmares. He's more goldfish than Jaws. The American finds the green to get a long look at birdie on 15. Koepka can stick it in neutral and free wheel now.
At least we don't face a lengthy play-off on Monday eh? You'll have to find another way to waste time at the office.
Fleetwood (-11 after 16)
Tommy Fleetwood has seen Brooks Koepka streak away from him today but the Englishman has held his own as he makes his latest par.
Koepka (-16 after 16)
Jay Townsend
BBC Radio 5 live at Erin Hills
Koepka is a big strong guy. He looks like a rugby player. At the age of 10, he was a passenger in a car accident. As a result, he was banned from playing contact sports. That's how he got seriously into golf. It was kind of by accident.
Koepka (-16 after 16)
There will be no meltdown. Koepka is ice cold.
Over 16ft for birdie? No problem. He swings it in like it's nothing for his third straight birdie.
The American is now level with Rory McIlroy's record winning score to par in US Open history.
The way he's playing he could well better it at the last. Heck, the way he's playing he could find a rare birdie at 17.
Fleetwood (-11 after 15)
Excellent chip out of the sand from Fleetwood, good chance to save par.
Fleetwood (-11 after 15), Koepka (-15 after 15)
Koepka just isn't missing greens right now. He finds his latest on the par three 16th. Just can't see him having a meltdown from here.
Fleetwood follows and finds sand but it shouldn't be the toughest bunker shot to save par.
Koepka (-15 after 15)
Jay Townsend
BBC Radio 5 live at Erin Hills
When I first saw Koepka on the European Tour you could see he had the intangibles. He had the quality but he had the parts of the game you don't necessarily see.
You can see he is playing smart. Even though pressure is building, he's thinking clearly.
Fleetwood (-11 after 15)
Good save from Fleetwood on 15, especially from where his second shot left him.
He navigates a three foot putt for par and stays level for the round.
Koepka (-15 after 15)
Golf writer Brian Wacker points to the fact that Brooks Koepka faces holes which he should negotiate...
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Koepka (-15 after 15)
Jay Townsend
BBC Radio 5 live at Erin Hills
Koepka controls his destiny now. He controls this tournament.
Koepka (-15 after 15)
Money.
Slight break from right to left but it's on course for the heart of the hole all the way.
Koepka moves to 15 under and a three-shot lead. His to lose now.
Harman (-12 after 14)
Brian Harman to put some pressure on Brooks Koepka now. Nicely done from five feet but up ahead on the course...
Iain Carter
BBC golf correspondent at Erin Hills
Wonderfully played by Tommy Fleetwood, using all the contours. I love to see that.
Fleetwood (-11 after 14)
So Fleetwood has an imposing chip up the hill to try and get close with his third shot at the par four 15th.
Oh that is a sublime stroke - using the ramped far side of the green from his position to bring the ball back down the stroke and close to the hole.