A tremendous shot from Rory McIlroy gives him a fair look at eagle on the 11th.

It screeches to a halt just a few revolutions from the hole.

Scheffler birdies the fifth and gets to within one of Bob, who is lining up his par save.

It dips to the left as it approaches the hole, and that will be a bogey.

Tied at the top. That four-shot lead is gone.

Bob splashes it out of the sand and manages to stop the ball around 10 feet from the hole.

Yet again, he has another huge par putt to come.

A truly sensational approach from Scheffler from the middle of the fairway. It lands around seven feet from the fifth pin, with just a hint of spin on the ball to stop it on the button.

MacIntyre, who is on the right of the fairway, has to fly a bunker to find the pin that's tucked in the back right corner.

He finds the sand, unfortunately. It rolls back down the face though, which will help.

A fairway-finder with the driving iron for MacIntyre on the fifth. A steady shot after a frenzied start to his round.

Scheffler takes the same club and also finds the middle of the fairway.

Oaft, a good try from Bob. His birdie putt just falls on the short side, he can kick that in for par.

Similar story for Scheffler's putt as they both walk off the par-five fourth with a par apiece.

Solid approach from the Scot, he's got another birdie putt coming up. Nothing fancy there, just a smart wedge play.

Scheffler's shot then fizzes out from the rough, it's a challenge to generate any spin, and it careers through the green and comes to a halt on the first cut.

Bob gets it out of the bunker, laying up is the only option here, though. He gets it right down there and in the short stuff.

Up next is Scheffler, who gives it a right old thwack, stepping through it and chasing after it.

It flies a mile but takes a dive into the right rough.

Tommy Fleetwood rolls in a confident putt to move within six of the lead.

How are the nerves so far?

Send us your thoughts here.

You need around 315 yards to carry the bunker down the left of the fourth fairway.

Bob MacIntyre's drive splashes in the sand, just a few yards short of carrying it.

Scottie Scheffler then drives over the sand but finds the left rough.

A decent lie for either would be a huge advantage.

That decent look at birdie for Bob agonisingly slips past, and he tidies up for par.

Scheffler's birdie putt comes up shorter than he'd have liked before his par putt lips out.

An unforced error from the world number one. A two-shot lead once again.

The top six players on the Team USA qualifying list will be locked in after play concludes tonight.

Scottie Scheffler, J.J. Spaun, and Xander Schauffele are already qualified.

Russell Henley, Bryson DeChambeau, and Harris English will be there too, as it stands.

The downhill par-three third next. 202 yards. Eight iron for both.

Scheffler plays it safe and finds the middle of the awkwardly slanted green.

MacIntyre responds with a laser to seven feet and a decent look at birdie.

That is more like it.

Ach. Bob's par putt rolls by the hole. He cleans up for bogey.

Scheffler makes par, and it's a one-shot lead now.

Just like that...

Two PGA Tour wins already for Bob, both coming last year.

At the 2024 Canadian Open, he held off a host of challengers to win his first PGA Tour title at the RBC Canadian Open, with his dad caddying for him. He started with a four-shot lead here... just saying.

He followed that with "the one he wanted" in the 2024 Scottish Open. Here, he staged a late surge to glory at the Renaissance Club.

He is no stranger to the pressure he will be feeling.

Image source, Getty Images

Ludvug Aberg misses a seven-foot birdie putt as he looks to apply some pressure to the final pairing.

MacIntyre hacks it out from the rough, and it skips across the green before rolling back a few feet. It's been an inauspicious start to say the least. He's got a long, long look for par.

A few jeers from the American crowd for that one, too.

Scheffler rolls his lengthy birdie attempt to within kick-in range.

The BMW Championship is the second of three events that make up the FedEx Cup playoffs.

A season-long points total boils down to the top 70 players making the first event, then the top 50 making this week, and the top 30 making next week's tournament.

It's the elite of the elite going at it for big money and prestigious trophies, as they determine the FedExCup champion.

In last week's event, Justin Rose beat JJ Spaun in a nail-biting play-off to win the St Jude Championship, his first PGA Tour title in more than two years.

Next week we have the Tour Championship, with circa $10m going to the winner.

Whoever wins tonight will bank $3.6m. Decent work if you can get it.

Image source, Getty Images

MacIntyre has a decent angle from the rough, but it flies over the green, and he's left himself short-sided in the rough.

Scheffler keeps his foot down and sticks it on the safe side of the green. Efficient golf.