Gauff has a break point chance but Trevisan sees it off with a volley out wide which Gauff has to loop up, but it's long. Deuce

A backhand from Trevisan only makes it halfway up the net and that's deuce, with a half chance here for Gauff to take an early control of the second set.

The unforced error count from Trevisan is creeping up and it's now at 27, something she needs to wipe from her game from now on if she is to have any chance here.

Gauff holds, thanks to a deep double-handed backhand, which Trevisan nets.

After some unconvincing service games in the first set, a much-needed morale-boosting hold to love for the Italian.

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A straight-forward hold to 15 and 18-year-old Coco Gauff, the 18th seed, gets the second set off to a solid start.

Can she get herself into her first Grand Slam final?

Martina Trevisan, after some physio work on her thigh, is good to go and Coco Gauff is ready to get the second set under way.

Trevisan has called for the trainer and is needing some medical help before she can play the second set.

She's the world number 59 and it's already a big ask if she is to get back into this match.

Christopher Clarey
New York Times tennis reporter on BBC radio

It has been a low-key French Open from a US perspective but if Coco Gauff wins this match it will get pretty exciting really fast.

If she was to get to the final it would raise a lot of volume in the US.

It's a fourth successive break for Coco Gauff!

Certainly not one of the greatest sets she'll ever play, but the 18-year-old is halfway to a first Grand Slam final.

Image source, Getty Images

Another miss from Trevisan, a 21st unforced error from the Italian's racquet, hands over two break points.

Some great depth from the back of the court from both players, but it's Trevisan who falters first. 0-30. Gauff is two points from the set.

Trevisan slices a tricky backhand over the net and Gauff can't lift it back over. A horrible shot to try and handle.

Gauff, looking to take charge of this set with a hold, is rather fortunate as a forehand smacks the cord and drops over, out of Trevisan's reach.

A hold! It could also be the set...

Christopher Clarey
New York Times tennis reporter on BBC radio

This crowd has been a big factor and it has been good to see it and hear it after everything we've all been through over the past two years.

And we might be about to have a fifth!

Three break points for Coco Gauff after a series of unforced errors from Trevisan...

A backhand seals it! On we go in this rollercoaster semi-final.

Four breaks of serve in a row tells you all you need to know about the feel of this contest so far.

Christopher Clarey
New York Times tennis reporter on BBC radio

Gauff tries to use the drop shot a lot, she likes to use it and she is trying to have a strong sense of what tactic she should play.

This is developing into a real tussle, but it's Gauff who is beginning to find her shots more frequently.

She catches a sweet backhand to deny Trevisan break point - oh but that's a response from the Italian. A lovely backhand of her own opens up another break opportunity... Taken!

A couple of misses from Gauff, who doesn't agree with either call despite the evidence available in the clay, take us to deuce.

Image source, Getty Images

Gauff begins on serve with a double fault, but she soon recovers and an ace makes it 40-15.

The American goes for the drop shot but it doesn't come off, keeping Trevisan in contention...

Christopher Clarey
New York Times tennis reporter on BBC radio

Gauff has to be one of the quickest players on the baseline on the women's tour.