Olga Danilovic is frequently getting to 40-15 in her service games now, but then struggling on game point to invite pressure - this time with a double fault.

But she's grown in confidence as this has gone on and serves out the hold from there to restore parity at 3-3. Game on.

Olga Danilovic is getting really frustrated, she's hitting much better but everything feels as though it's coming back with interest.

Aryna Sabalenka can see the finish line, and is perhaps the biggest barrier to her own progress here as she starts to try and rush through the points.

A couple of misses from the world number one give Danilovic a couple of break back points... And she gets it thanks to another miss from Sabalenka! Maybe this is not such a foregone conclusion after all...

It still feels a question of how long can Olga Danilovic stay with the world number one here, as she continues to serve from behind in this second set.

Aryna Sabalenka lifts a drop shot over to take the opening point on her opponent's serve, and doesn't relent from there.

Danilovic can't find her first serve and Sabalenka capitalises to make the breakthrough.

Aryna Sabalenka lets out a huge roar as she tries to get herself going again as she begins to feel a bit of pressure on her serve at 15-30, blasting a backhand down the line to move level.

The improving Olga Danilovic forces her way to deuce but Sabalenka finds a huge first serve to hold and stay out in front.

Still no sign of an upset brewing on Court Philippe Chatrier, but it's become much more competitive.

Olga Danilovic doesn't hide her frustration after knocking a volley into the net at the start of what is a very important first service game for the 24-year-old.

The world number 34 does well to recover from that, though, reaching 40-15 and then holding serve - despite first inviting pressure with a double fault.

Already a much better start to this set for the Serb.

Olga Danilovic pounces on a second serve to reach 40-30 on Aryna Sabalenka's opening game, but the world number one gets over the line to get herself up and running in set two as she pushes on for a quick victory here.

Ah, after some good work to get a foothold in this first set from 5-0 down, Olga Danilovic double-faults to hand the opener to Aryna Sabalenka after 35 minutes.

Aryna Sabalenka looks up to the sky and shakes her head after missing on her first set point. This isn't proving quite as straightforward as it was 10 minutes ago, although she's still very much in control.

Set point number two coming up.

Olga Danilovic is frustrated with herself after a drop shot falls perfectly for Aryna Sabalenka to run on to and slot down the line.

The 24-year-old is feeling much more at home on Court Philippe Chatrier now and slams a forehand down the line for game point, but Sabalenka battles to deuce.

Two games in a row for Olga Danilovic!

Aryna Sabalenka is still in control of this but she has resistance from the other side of the net now after a lightning fast start.

Olga Danilovic looks to have brushed off the early nerves that have shackled her so far and gets forward to pop away a forehand winner for 0-30.

That's much better. Aryna Sabalenka resets on serve to make her way back to 30-30, but Danilovic is getting stuck into the points now and whips a forehand winner cross-court for a first break point!

Olga Danilovic gets on the board! Aryna Sabalenka has a rare off game and decides not to go chasing this one down.

Instead, she'll serve for the first set after just 23 minutes.

Can Olga Danilovic avoid being served a Friday afternoon bagel? She's going to need to quickly reduce her number of errors to have any chance against Aryna Sabalenka in this form.

Sabalenka has made just three unforced errors in the first five games.

Image source, Getty Images

We do have some Brits in action early this morning at Roland Garros and it comes in the form of Joe Salisbury and Neal Skupski in the second round of the men's doubles.

The eighth seeds are currently a set up against Argentine Guido Andreozzi and France's Theo Arribage.

Too powerful, too sharp, just too good. Aryna Sabalenka is unleashing winner after winner, and just not missing. A blistering forehand winner brings her to 40-0.

But wait! Olga Danilovic finds a bit of rhythm and fights her way to deuce with the full backing of the crowd. Sabalenka escapes with a powerful first serve, but that run of points will be a big boost for Danilovic with this first set already seemingly out of sight.

Olga Danilovic doubles her points tally in this match by saving a break point for 30-40, but Aryna Sabalenka is not giving anything away for free.

These two are separated by only 33 places in the world rankings, but the gulf in class here is enormous. Goodness me Sabalenka is going to take some stopping this fortnight.

Aryna Sabalenka is not in the mood to hang about today!

A few devastating swishes of the racquet later and the world number one holds to love to race into a 3-0 lead inside seven minutes.

She has started this in quite frightening form, and Olga Danilovic looks shell-shocked.

The world number one has started as you'd expect.

Unfortunately, the 34th-ranked Olga Danilovic has not quite hit the ground running.

Despite painting the line with a wonderful backhand winner, Danilovic is broken to 15 in her opening game.

And we begin our live text today with Aryna Sabalenka's bid for a place in the fourth round.

The midday sun is beaming down on Court Philippe Chatrier as the world number one begins with a comfortable hold of serve.

Image source, Getty Images

Here's a few highlights to mark your card for the day.

Women's world number one Aryna Sabalenka opens the action on Court Philippe Chatrier against Serbia's Olga Danilovic.

Men's 10th seed Holger Rune and women's fourth seed Jasmine Paolini are in action in the following matches, before Carlos Alcaraz takes on Bosnia's Damir Dzumhur in the night session.

Defending champion Iga Swiatek resumes her campaign on Court Suzanne Lenglen against Romania's Jaqueline Cristian, before a huge match sees 12th seed Elena Rybakina take on former champion Jelena Ostapenko.