Postpublished at 23:44 British Summer Time 19 May 2019
Anthony Wall
Two-time European Tour winner on BBC Radio 5 live
It's lovely to see the emotion at the end. We've questioned his emotion sometimes but we all saw it there.
Champion: -8 B Koepka
-6 D Johnson; -2 M Wallace, J Spieth, P Cantlay
+1 R McIlroy; +5 J Rose, P Casey, G McDowell
+7 D Willett, M Fitzpatrick; +8 T Fleetwood, T Hatton
Alistair Magowan, Steve Sutcliffe and Becky Grey
Anthony Wall
Two-time European Tour winner on BBC Radio 5 live
It's lovely to see the emotion at the end. We've questioned his emotion sometimes but we all saw it there.
Iain Carter
BBC Sport golf correspondent at Bethpage
It's just massive relief. That's the overwhelming sensation. In the end he had to grind all the way home and eventually got it done.
B Koepka -8 (F)
Easy does it. Pressure. What pressure?
B Koepka -8 (17)
Brooks Koepka has paced up to the green to have a look at how the land lies.
He's visualising what he needs to do here, with wedge in hand. And here it comes.
Absolutely Perfect. He'll have a six-footer for par. He can afford to two-putt here and still win.
B Koepka -8 (17)
Mercifully for Brooks Koepka he's in the sand. Out comes the sand wedge - which looks a little more worn today - to get himself back on the fairway.
Dustin Johnson is wide-eyed as he signs his card. He has just seen Brooks Koepka's wayward tee shot on a TV in the scorer's hut.
M Wallace -2 (F)
Matt Wallace, who is set for his best finish at a major tied for third, said on Sky Sports:
"That was hard. I had a little wobble on 12 mentally and had to knuckle down. It was tough at the end, I don't think I hit a green in regulation but it was satisfying for sure.
"I'm buzzing for the next major. I've shown that I can compete. I'm a little bit far away from the leaders but that's a few putts here and there. If I can try and get better at every single part of my game to compete with the likes of Brooks [Koepka] and DJ [Dustin Johnson].
"I feel I'm right there mentally. The approach is going right and hopefully I can do that at the next tournament."
B Koepka -8 (17)
Brooks Koepka is putting himself through the wringer here.
He's gone left off the tee. Can't tell if he's in the sand or the long grass here.
Alex Miceli
US golf reporter on BBC Radio 5 live
Looking at the scoreboard, I can only see one double bogey on the last today.
Par four, 411 yards
Either lay up short of the deep cluster of bunkers on both sides of the drive zone or be more aggressive and attempt to drive between or beyond them.
The uphill approach is played to a blind putting surface. An easy finish right?
B Koepka -8 (17)
Ooooooo. Brooks Koepka just leaves his first putt on 17 short.
That leaves him with a wriggly one from five feet to save par... that he pushes past.
Squeaky bum time II?
Andrew Cotter
BBC Sport commentator
If Dustin Johnson finishes runner-up here he will join the unhappy club of players to have done so at all four majors.
D Johnson -6 (F)
Dustin Johnson gets a standing ovation from the crowd as he finishes with a par on the 18th.
He doesn't look happy, but you wouldn't be after coming that close to a huge comeback and falling short.
He's still the only player in the top five to go under par today.
Those airport taxi trips can be pricey...
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B Koepka -9 (16)
Brooks Koepka started today 67 under par in major championships since 2016.
It's been anything but plain sailing on the back nine holes here but victory at Bethpage Black would make him the first player to win his first four majors in two years or less.
And he would also be the first player to win three out of five majors since Tiger Woods in 2001. Any time you're mentioned in the same sentence as an in-pomp Woods isn't bad!
D Johnson -6 (17)
Hundreds of phone cameras are dialed in on Dustin Johnson as he chips onto the green from deep within the crowd.
He doesn't let it distract him though and should be able to finish with a par after that shot that hopped and skipped across the green to about five feet.
Anthony Wall
Two-time European Tour winner on BBC Radio 5 live
Dustin's just hit some of the worst shots I've ever seen him hit. It's the mindset. He's gone from being the hunter to the hunted and that's affected him.
B Koepka -9 (16)
A second welcome par on the spin for Brooks Koepka. He's almost there.
D Johnson -6 (17)
Oh Dustin... That's the end of that.
Dustin Johnson finds himself in a bunker on the 18th and whacks the ball straight into the crowd to the left of the green.
B Koepka -9 (15)
Imagine all this this will make for a decent chat when Brooks Koepka and Dustin Johnson hit the gym next?
Koepka's stiffed his second on to the green at 16. He should get down in two from there.
Although 45 minutes ago I would not have been so sure.