A bronzed Billy Horschel is quite clearly used to sunnier climes than South Ayrshire.

A clean swing of a nine iron and he's on to the green at the 13th and then sinks an awkward putt to take par.

Justin Rose stews for a while on the green, then follows Horschel with a par of his own.

Here's how the top of the leaderboard looks:

• -6 Brown (12)
• -5 Horschel (13)
• -4 Schauffele (15), Rose (13), Lowry (12)
• -3 Lawrence (65), Burns (65), Henley (66)
• -2 Scheffler (14)

Click here for the full leaderboard

Dean Burmester loses a shot after missing the 14th green by a good 30 yards to the right!

From there he can't get up and down, which Scottie Scheffler manages although he'd only just missed the putting surface off the tee.

Catriona Matthew
Captain of Team Europe at the 2019 & 2021 Solheim Cup

I think in these next five holes, Scheffler’s really got to hang in there.

If he has a look at the leaderboard, he’ll see no-one’s really done anything this afternoon and he can just get in with even par or one under if he can sneak one birdie in.

This pair are hitting into the teeth of the wind at the 16th, trying to somehow claw some scoring the stretch.

No chance of finding any greens in two with the wind swirling back in their faces but Patrick Cantlay and Xander Schauffele are well placed to attack with their third.

This is where things started to unravel for Shane Lowry.

Plenty of time left though.

Can I just remind everyone Dan Brown missed the cut in seven of his previous nine events?

Absolutely brilliant.

Andrew Murray
Former European Tour winner on Radio 5 Live

Dan Brown is putting with so much assuredness.

Apart from anything else he takes no time, but then he hits it solidly. No doubt.

We have a new leader.

Shame on anyone who thought Dan Brown couldn't go the distance - he's been superb today and has tucked that putt away confidently.

Astonishing.

We might need to start dusting off those major winners on debut stats.

Ugly for Shane Lowry though as he ends up with another bogey and suddenly slips two shots back.

Collin Morikawa couldn't keep his fine round going, dropping three shots on his way home to reach the clubhouse on two over for the tournament.

Players have come back from further behind the leaders in the final round to win The Open...

Image source, Getty Images

First real error off the greens and first bogey of the day for Scottie Scheffler on 13, as he can only get his pitch from just off the front of the green to nine feet.

And since he's not made anything over six feet today the resulting miss is almost inevitable, and just what happens if you don't take your chances with the putter around here.

In football terms he's dominated possession but can't put the ball in the back of the net - and Royal Troon has just equalised very much against the run of play,

Simon Foat
BBC Radio 5 Live golf editor

Keep going team - you’ve got this out there.

Unfortunate for Shane Lowry as his approach into the 12th green hops the wrong way, hitting the green and trundling off the slope.

Maybe he was put off by playing partner Dan Brown's excellent second shot that landed four feet from the pin.

Brown will have that very shortly for the outright lead.

Second hardest hole on the golf course for Xander Schauffele at the 15th and he's navigated it with the minimum of fuss.

A tremendous chip off the green rolls to within a foot and he cleans up for par.

That could have been treacherous.

That's how it has proved for Patrick Cantlay - another bogey as a putt scuttles by.

Peter Scrivener
BBC Sport at Royal Troon

Image source, BBC Sport

The weather is not just affecting the players' ability to operate.

Radio 5 Live commentator Alistair Bruce-Ball is out following Justin Rose and Billy Horschel and his notes have taken a bit of a battering.

You can listen to Ali and the rest of the team by clicking the link at the top of this page.

An inch. Maybe an inch and half. Billy Horschel has a birdie chance on the green at the 12th only to watch the ball agonisingly finish just wide of the hole.

"Wow," he says to himself as he crouches on to his haunches.

His playing partner Justin Rose, also now with his cap turned backwards, has just struck a solid tee shot on the 13th.

Jon Rahm is muttering to himself trudging off the 18th green after carding a one-over round of 72, where he could just not get anything going.

He's not done too much wrong from tee to green, and he even managed to navigate his way around Royal Troon without going into a single bunker, which is half the battle.

Image source, Getty Images

But he's ranked down in 69th for putting in this round and that will tell you all you need to know.

The fact is, though, that he's seven shots back and could be a touch closer come the close of play, and if the weather's changeable again tomorrow then who knows...

Those lads who went out in the dry - and even a bit of sunshine - this morning and put low scores on the board are suddenly feeling very nice about life.

Thriston Lawrence and Sam Burns, who shot 65s earlier, are just two off the lead now, as is Russell Henley.

Major champions Adam Scott and Justin Thomas are on even par, which is a tie for 11th.

Peter Scrivener
BBC Sport at Royal Troon

There are hundreds of fans who've decided they've had enough and are heading for the exits.

Four hours of constant rain can do that to you.

Thousands more are staying on though. Once you're wet I guess you can't get any wetter.

These guys are used to whacking drives 330 yards+ on the PGA Tour.

Patrick Cantlay has steamrollered his effort on the 15th and it's only gone 250 yards.

American golfer - meet Scotland's wind.

There's only one winner.