Matteo Berrettini puts a forehand into the net and it's another break point chance for Matteo Arnaldi.

What a turnaround this could be...

Gigi Salmon
BBC Sport tennis commentator on BBC Radio 5 Live

Matteo Arnaldi has won 12 of the past 16 points.

Matteo Arnaldi recovers from 0-30 down to hold serve and move into the lead for the first time in the match.

Four games in a row for the younger of these two Italian players. Arnaldi is 25, Berrettini is 30.

Naomi Broady
Former British player on BBC Radio 5 Live

Matteo Berrettini is immediately pointing up to the floodlights. I wonder if he has lost the ball in it.

Image source, Getty Images

Oof, Matteo Berrettini gets a chance to volley a winner on break point but he puts it into the net and, in a flash, that double-break advantage has disappeared.

Berrettini tells his team that he lost the ball in the lights.

Matteo Arnaldi is standing so far back when Matteo Berrettini serves, he's almost in Monte Carlo.

Of course that's an exaggeration, but he must be six or seven metres behind the baseline when Berrettini delivers, such is the strength of Berrettini's first shot.

That tactic is starting to work - Arnaldi has another break point to level the first set.

A deft drop shot that only just clears the net is the highlight of Matteo Arnaldi's first service hold of the match.

He's got a foothold in this quarter-final now.

Russell Fuller
BBC tennis correspondent on BBC Radio 5 Live

Matteo Arnaldi is certainly discovering his legs.

This is the first men's Grand Slam quarter-final between players outside the top 100 since 1991.

Image source, Getty Images

As this game reaches the 10-minute mark, Matteo Arnaldi earns himself another chance to break - and this time he takes it!

He gets back another massive Matteo Berrettini serve, Berrettini chooses to take on the volley and plants it into the net.

Matteo Berrettini wide with a cross-court forehand.

Break point number four for Matteo Arnaldi, who can't return a first serve and it's deuce again in what's turning into a marathon fourth game.

Naomi Broady
Former British player on BBC Radio 5 Live

Matteo Berrettini doesn't want to let the early double break go, it is a nice cushion.

Jamie Murray
Seven-time Grand Slam doubles champion on BBC Radio 5 Live and BBC Sounds

That was a bad miss. Matteo Arnaldi had set it up perfectly. He will be annoyed with himself.

Image source, Getty Images

That was the best of the three chances so far for Matteo Arnaldi, but he can't put the volley away and we're back to deuce.

Jamie Murray
Seven-time Grand Slam doubles champion on BBC Radio 5 Live and BBC Sounds

This is the biggest match of Matteo Arnaldi's career. The first time in a Grand Slam quarter-final, but he has played over 17 hours of tennis coming into this. That has got to weigh on you.

And he has another break point...

Ace down the T, about 120-odd miles per hour.

Matteo Berrettini possesses a tremendous serve that can get him out of tricky situations, and it does so here, saving the break point.

But Matteo Arnaldi wins a battle at the net and has another break chance.

That's better from Matteo Arnaldi, who pounces on a poor drop shot to hit a winner for 0-30.

Matteo Berrettini wins the next two points, but some good Arnaldi defence earns him a break point.

Jamie Murray
Seven-time Grand Slam doubles champion on BBC Radio 5 Live and BBC Sounds

Italian tennis has been on fire. It's a golden generation at the moment.

Yes they're not doing too badly! Three straight Davis Cup titles and three quarter-finalists at Roland Garros - and that's with Jannik Sinner out early, plus Lorenzo Musetti not playing in the tournament because of injury.

The smallest of misjudgements by Matteo Arnaldi, who allows a sliced forehand from Matteo Berrettini through thinking it's going long - but it clips the baseline for a winner.

Berrettini puts away a smash later in the game and he has a chance for a double break in the first set... and gets it as Arnaldi goes wide with a backhand.

A nice settler on serve for Matteo Berrettini, who follows up the break with a solid hold to 15.

Matteo Arnaldi isn't quite at it yet.