Those DJ chants are getting louder and Brooks Koepka looks flummoxed.

He takes out his wedge but totally misjudges a huge landing area to run off the fringe on the other side of the green. These are tricky at best.

Has anyone lost a lead as big as the one Brooks Koepka started today with?

Wheels. Coming. Off. ?????

He's airmailed the green at 14 and looks baffled by that.

A 300-yard drive onto the fairway from Dustin Johnson on the 16th. He wants this.

Anthony Wall
Two-time European Tour winner on BBC Radio 5 live

Brooks Koepka hasn't turned it on all weekend. He's been playing good golf but just not like the stuff he was playing in the first two days. It's game on.

James Bamford: This is starting to get interesting... A bit of of wind and we see what they are made of.

Iain Carter
BBC Sport golf correspondent at Bethpage

No player has lost a seven-shot 54-hole lead at the US PGA Championship.

Image source, Getty Images

So what's up next? The green at 14 was enlarged in 2009 to allow three new hole locations, including one on a new front-left tongue.

A new back tier also requires precise distance control.

Oh. Wow.

'DJ' is the chant from the crowd as Dustin Johnson holes his birdie putt. Things just got interesting.

Anthony Wall
Two-time European Tour winner on BBC Radio 5 live

I'd just be thinking about hitting the next fairway. Keeping it as simple as that.

Andrew Cotter
BBC Sport commentator

It's getting nervous, very tense for Brooks Koepka now.

Is Brooks Koepka just trying to tease us, and give us the grandstand finish we've been after all week, but had given up on long ago?

Three consecutive bogeys for the first time since August 2018, could not have been more untimely. The lead is down to three.

A three-shot lead doesn't sound too bad does it?

Dustin Johnson's second shot lands on the 15th green and curves backwards towards the hole. Could be a very makeable birdie putt.

After his double bogey on the 12th, it's a bogey for Jazz Janewattananond on the 13th. It's his first Sunday at a major and he's +3 for the day.

It feels like Matt Wallace should be making birdies all over the place, but this course is so cruel. There are only seven players under par overall.

Wallace hits a lovely approach a few feet from the 15th hole, but a trip into the rough earlier means the putt will only be for par.

Image source, Getty Images

It's fair to say that the crowd gathered round Brooks Koepka enjoyed that. He virtually had fans trying to jump on his back as they celebrated wildly.

That is hardcore.

Swish. Out comes the seven iron and Brooks Koepka pummels a shot down towards the cup some 347 yards away.

It was blind and into the wind but it looks as though he's ok on the left of the fairway.

Dustin Johnson seems unfazed as he hits another enormous tee shot on the 15th.

Andrew Cotter
BBC Sport commentator

Cameras down says the marshal but nobody moves.

Andrew Priestley: The poetic justice of Dustin Johnson winning a major championship as the wheels fall off a front-running runaway leader would be quite something given his own past.

What a touch. Brooks Koepka looks like he's got a decent lie down the left. Is that where the crowds peel round?

Looks like he's just trying to fathom what to do...go for the green or lay-up? Over to you Brooks.