Jonathan Jurejko
BBC Sport at Roland Garros

Zverev loves to contest a mark. He's done it regularly during the tournament.

This time he hangs on the net in annoyance as the point goes against him.

The crowd, naturally, whistle at him.

Alexander Zverev is furious.

His shot is called out and Carlos Alcaraz has two break points.

Greg Rusedski
Former British number one on BBC Radio 5 Live

It only gets more difficult for Zverev as he gets closer to the finish line. Will he pass the test?

Well played from Alexander Zverev, who works Carlos Alcaraz from one side of the court to the other before firing down an overhead at the net.

He tries to do the same on the next point, but Alcaraz somehow gets to it and attempts an audacious lob.

He gets it! 15-30.

Annabel Croft
Former British number one on BBC Radio 5 Live

Alcaraz was looking so in command and then he started shanking his forehands. I feel like he's lost of that bounce and joyfulness that he has on court.

Alexander Zverev throws his hands up the air after a backhand miss and shouts in the direction of his team. An unusual reaction after just winning the third set.

Carlos Alcaraz plays a wide serve that the German struggles to recover from, and the Wimbledon champion gets the hold over the line after Zverev nets.

That's an important one for the Spaniard.

Now then, how will Carlos Alcaraz respond to that?

The Spaniard is looking rather disappointed as he waits at his chair while Alexander Zverev goes for a bathroom break.

Jonathan Jurejko
BBC Sport at Roland Garros

Lots of German voices can be heard as Zverev's name rings around the stadium.

That's retaliation for some jeers when Zverev swaps a ball he doesn't like the look of.

Finally he gets over the line and the black, red and yellow Bundesflagges flap.

Image source, Getty Images

Russell Fuller
Tennis correspondent on BBC Radio 5 Live

Zverev kept his nerve spectacularly well. Alcaraz looks a little bit shocked.

What a turnaround!

From 5-2 down to taking the set. Incredible stuff from Zverev.

The German just keeps sending crunching forehands down from the baseline, Alcaraz does well to stay in the rally but eventually it's too much for the Spaniard and he can only find the net.

What a match.

Just as you think this game is going one way, it flips on its head.

Zverev takes the smash volley to bring up a second set point.

Lifeline for Alcaraz! He brings up break point with a punishing forehand.

But then a mistake on the next point has him looking up to the sky in frustration.

Greg Rusedski
Former British number one on BBC Radio 5 Live

When Zverev gets nervous, he doesn't like having the ball coming at him high and with no pace.

Is Alcaraz's current tactic confusion? He's certainly drawn a few frowns here in the office with three consecutive looping backhands to completely take the pace off the ball and throw Zverev off at the same time.

Whatever he did there it worked. He saves set point. Deuce.

Zverev recovers with a huge ace to bring up set point.

Annabel Croft
Former British number one on BBC Radio 5 Live

Alcaraz is all over the place. I think he looks lost, he doesn't know what to do.

Image source, Getty Images

Is there another twist yet? Two mistakes from Zverev and we're at 30-30.

Cameras show Zverev's dad in the stands, he has his head down. Can't watch.

No shade against Donny.

Jonathan Jurejko
BBC Sport at Roland Garros

Alcaraz's timing is off like a hooky watch from Doncaster Market.

He's blaming the court, it seems, and has a word with umpire Renaud Lichtenstein at the changeover.

Alcaraz looks absolutely befuddled as Zverev quickly gets out to 30-0. Two more points for the set.