Oh dear.

Vondrousova can't get the ball over the net and Barty gets the chance to serve for the set.

Image source, Reuters

Barty brings her opponent to the net, then whacks a forehand past her to bring up another break point.

Vondrousova saves the first break point with an 83 mph winner, then the second with a powerful cross-court forehand.

And the third as Barty hits the ball into the net after a lengthy rally. Impressive!

Barty beats Vondrousova at her own game. Disguising a drop shot perfectly to get three break points.

Chanda Rubin
American former world number six on BBC Radio 5 live sports extra

That has to be a welcome relief for Vondrousova.

She has to remind herself she has plenty of time - there's a lot of tennis to be played. We know how well she can play. It should now be a more competitive match.

These two have the youngest combined age (42) of two female Grand Slam finalists since the 2008 French Open when Ivanovic beat Dinara Safina.

The pair have met twice before in tour-level matches, with Barty not dropping a set in victories on the grass in Birmingham in 2017 and the Cincinnati hard court last year.

Well, well, well.

Vondrousova has come to the (Barty) party.

Image source, AFP

Vondrousova gets a second break point, but Barty has her on the run and maintains her 4-0 lead.

But wait, a first crack in Barty's composure might be showing. She double faults to give the Czech a third go at breaking.

Barty hits the ball into the net and Vondrousova has break point.

The Cezch gives a drop shot a go and Barty slams it back with a forehand. Vondrousova looks a bit caught off guard by the fact she can't use her favourite shot.

Vondrousova rumbles into life as she goes 30-0 up on Barty's serve.

But the Australian steps up her game and levels things at 30-30.

Image source, Reuters

Jonathan Jurejko
BBC Sport at Roland Garros

And, of course, Barty raced into a 5-0 first-set lead against Amanda Anisimova yesterday - then lost it on the tie-break.

So it's not over yet...

Kev Hannah: Let’s get the Barty Party started! Come on Ash!

Jonathan Jurejko
BBC Sport at Roland Garros

Marketa Vondrousova made a nervy start against Johanna Konta yesterday and lost the first 10 points - and it has been a similar tale here.

This time she won three points in the opening three games, but then went on a run of losing seven straight points.

An encouraging cheer greeted her ending that sequence for 15-30, but it still wasn't enough to stop the teenage Czech going a double break down.

Wowzers. Thirteen minutes on the clock and four games to Barty.

First break point saved, but Barty soon wins another.

Vondrousova's drop shot comes off this time and she saves break point again.... before giving away another by hitting the ball into the net.

Chanda Rubin
American former world number six on BBC Radio 5 live sports extra

This is Vondrousova's first time on Chatrier - there is a lot to get used to. She is dealing with a lot. There was also the delay because of the late finish of the men's semi-final.

The nerves don't go away - you have to manage them.

Image source, Getty Images

Vondrousova's drop shot has been her go-to this week. But Barty sees it coming and sprints forward to go 15-0 up.

The Australian wins the next point, but Vondrousova regains her composure to make it 30-30.

Barty makes light work of another drop shot and has break point.

This final is perhaps an unlikely line-up, but shows how open women's tennis is at the moment.

Barty, 23, who quit tennis to play cricket in 2014, described reaching a Slam final as "crazy".

After becoming the first teenage Grand Slam finalist since 2009, Vondrousova said: "It is the best week of my life."

None of this messing around that the men were doing earlier.

Barty holds to love and is 3-0 up after just eight minutes of play.

Image source, Getty Images

Chanda Rubin
American former world number six on BBC Radio 5 live sports extra

Vondrousova is still tight - a bit of tension in her muscles.