Big cheers again for Marta Kostyuk as she fires in a forehand for the opening point on Mirra Andreeva's serve.

Will having the crowd so heavily behind her opponent begin to get to Andreeva?

The Russian misses a forehand for 15-30 and Kostyuk begins to sense an opening.

Mark Woodforde
17-time Grand Slam doubles champion on BBC Radio 5 Sports Extra 2 and BBC Sounds

This was a key game for Marta Kostyuk to progress further in this tournament.

Let's hope that is the boost and impact of holding serve for Kostyuk.

The crowd wants to see a competitive match.

Image source, Getty Images

Another miss on game point from Marta Kostyuk.

She will struggle to forgive herself if this one gets away from her.

Finally! A terrific drop shot earns cheers and applaud from the crowd as she at last holds to get on the board in the second set.

Marta Kostyuk has a word with herself at the back of the court after messing up a routine volley at the net on game point.

It doesn't have the desired effect, and she produces a double fault to bring Mirra Andreeva to deuce.

The frustration is really showing now as she nets on her third game point. She knows that this surely is game over if she doesn't get over the line here.

Mark Woodforde
17-time Grand Slam doubles champion on BBC Radio 5 Sports Extra 2 and BBC Sounds

Marta Kostyuk is not helping herself. It is Kostyuk that is contributing to this healthy lead for Mirra Andreeva.

Image source, Reuters

Russell Fuller
BBC tennis correspondent on BBC Radio 5 Sports Extra 2

That really is another blow to Marta Kostyuk.

Kostyuk is being outplayed here.

Image source, Getty Images

Mirra Andreeva is just three games away from a place in the French Open final.

The Russian has been excellent, not least in defence, and stays in a final rally long enough to see Marta Kostyuk make a 22nd unforced error.

Mark Woodforde
17-time Grand Slam doubles champion on BBC Radio 5 Sports Extra 2 and BBC Sounds

Marta Kostyuk is battling with herself, the opponent and maybe even the conditions.

Some quick breaths as Kostyuk stands there... I am sure her coaches are trying to get her to calm down.

Image source, Getty Images

That is so, so good.

Another stunner off the backhand from Mirra Andreeva gives her a perfect start in this set.

Marta Kostyuk is really up against it now.

A really important game here for Marta Kostyuk, no doubt about that.

But, after making a positive start to the second set on her opponent's serve, she misses a forehand. Break point.

Mark Woodforde
17-time Grand Slam doubles champion on BBC Radio 5 Sports Extra 2 and BBC Sounds

That could be a huge game. Going back to the second game of set one, Mirra Andreeva had just broke serve. This might be another bonus for Mirra Andreeva to continue this momentum.

Image source, Getty Images

Mirra Andreeva may only be 19, but she is contesting her second semi-final at Roland Garros having also reached that stage in 2024.

If she goes on to win the title, she would become the third-youngest first-time Grand Slam champion this century, behind only Maria Sharapova and Emma Raducanu.

While Marta Kostyuk has an unrivalled unbeaten streak on clay, no player has amassed more wins on the surface this season - or indeed overall in 2026 - than Andreeva.

The Russian 19-year-old has 34 match wins this year, with 20 earned on clay.

Victory today would see her become the fourth-youngest woman to reach the French Open final in the last 30 years, after Martina Hingis, Kim Clijsters and Coco Gauff.

Image source, Getty Images

That just about sums it up for Marta Kostyuk so far, as her shot hits the net cord but bounces back on to her side.

Mirra Andreeva comes through a first real test on serve to get up and running in set two.

Marta Kostyuk shakes her fist to the crowd as she guides a sublime forehand winner down the line for deuce on Mirra Andreeva's serve.

Can she make a breakthrough at the start of set two?

A missed backhand from the Russian hands her a break point, but Kostyuk can't take advantage for now.

Mark Woodforde
17-time Grand Slam doubles champion on BBC Radio 5 Sports Extra 2 and BBC Sounds

It is going to be a real test for Kostyuk.

That was an exceptionally well played first set from Andreeva.

Image source, Getty Images

That first set is a huge surprise, because nobody on tour can match Marta Kostyuk's record on clay this season.

The 23-year-old is on a 17-match winning streak on the surface, with 16 successive wins at Tour events and one in the Billie Jean King Cup Qualifiers.

She is the only player undefeated so far this season on clay at WTA level, and has beaten Mirra Andreeva twice this year - including in the Madrid final last month.

The first Ukrainian to reach the women's singles semi-finals at Roland Garros in the Open Era, she is seeking to become the first Ukrainian woman to reach a major singles final.

David Law
Commentator on BBC Radio 5 Sports Extra 2

Marta Kostyuk is not controlling the ball anywhere near as well as Mirra Andreeva.

At the moment, Andreeva is playing on autopilot, and it is all going well.

Marta Kostyuk is relieved to see Mirra Andreeva miss on break point, but the Ukrainian returns the favour to give her opponent another opportunity.

With little over 30 minutes on the clock, Kostyuk nets to concede the first set. This is getting away from the 15th seed remarkably quickly here and she needs to change things if she's going to have any hope of turning this around...

The crowd rally behind Marta Kostyuk as she takes the opening point on serve.

There's a lot of love for her out there - and a desire to see a competitive semi-final.

The Ukrainian has been backed into another corner, however. From 30-15, she finds herself up against another break point.

Mark Woodforde
17-time Grand Slam doubles champion on BBC Radio 5 Sports Extra 2 and BBC Sounds

We have all witnessed some of those moments when Mirra Andreeva has coughed up healthy leads and handed the match back to her opponent.