Ben Shelton pushes Carlos Alcaraz back on the baseline and the Spaniard puts a tired-looking forehand into the net for 0-30.

Can Shelton get an immediate break back?

He can't, as Alcaraz ups his game with his forehand doing much of the hard work on the way to holding.

Annabel Croft
Former British number one on BBC Radio 5 Sports Extra 2 and BBC Sounds

I feel like this match is going to get a little more difficult. Unless there's a big drop-off from Ben Shelton.

Well played Alcaraz - it has been an uphill battle for the past hour. Suddenly he has earned a break right there.

Image source, Getty Images

Here's a chance for Carlos Alcaraz as a loose shot from Ben Shelton gifts the Spaniard a 0-30 lead.

He takes a few deep breaths and claws a couple of points back - one with a curling forehand down the line.

It's in vain as Alcaraz brings up break point and makes it count, before celebrating with a fist pump towards his coaching team.

Annabel Croft
Former British number one on BBC Radio 5 Sports Extra 2 and BBC Sounds

Carlos Alcaraz has to keep it away from this huge forehand of Ben Shelton.

It has been a very tight match. Very stressful.

Ben Shelton forces Carlos Alcaraz into the net for 30-30 before Carlos Alcaraz regains his composure and goes on to hold.

Image source, Getty Images

We've already had two magnificent comebacks on Court Philippe Chatrier today in Elina Svitolina's win over Jasmine Paolini and Iga Swiatek's victory against Elena Rybakina.

Surely we're not due a third... are we?

Ben Shelton is off to a strong start in the fourth set with a brisk hold.

Annabel Croft
Former British number one on BBC Radio 5 Sports Extra 2 and BBC Sounds

I did not see that coming.

I though Carlos Alcaraz was on top of this match.

If he gritted down, he had a chance to close out the match.

Ben Shelton will feed off the energy.

It is danger time.

David Law
Commentator on BBC Radio 5 Live and BBC Sounds

The first set Ben Shelton has ever won against Carlos Alcaraz.

We're heading for a fourth set. Carlos Alcaraz plays a tired forehand from the baseline way wide and shakes his head as he trudges back to his chair.

American Shelton roars with delight. He's right back in this.

Shelton goes for another crunching forehand winner but slams it into the net. 30-40.

How's your luck?! Ben Shelton hits the very top of the net-cord and the ball rolls over to Alcaraz's side. The American apologises, but secretly he'll be delighted. 15-40. Two set points.

Not far away at all. Shelton unleashes a sledgehammer of a forehand winner to go up 15-30.

Image source, Getty Images

Annabel Croft
Former British number one on BBC Radio 5 Live and BBC Sounds

Ben Shelton is continuing to knock on the door. He's not too far from taking this into a fourth set.

Alcaraz can still go up a few gears I reckon. He's got new balls to serve with and at 0-15 gets himself into a right battle, but finishes off a rally with an overhead smash at the net.

Annabel Croft
Former British number one on BBC Radio 5 Live and BBC Sounds

Image source, Getty Images

Ben Shelton has done a good job to get through that game.

A couple of those points were deenergised for Carlos Alcaraz.

It went a bit flat.

A big hold from Shelton is cheered by the crowd as the American continues to blow Alcaraz away with his first serves.

Still we go on in the third set.

Annabel Croft
Former British number one on BBC Radio 5 Live and BBC Sounds

A ridiculous serve. It sounded like a fireball going through the court.

A 130mph ace. Wow.

Image source, Getty Images

Yep, a lot less security now as Shelton mishits a forehand long. Is this the moment?

Annabel Croft
Former British number one on BBC Radio 5 Live and BBC Sounds

Ben Shelton is feeling it.

You can sense there's a lot less security on the ground strokes.