Jonathan Jurejko
BBC Sport senior tennis reporter at Roland Garros

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Despite the presence of a French player, it is far from a full house on Court Simonne Mathieu.

Boulter has been battling herself more than Monnet or the crowd.

The British number one is receiving plenty of vocal encouragement from her fitness trainer Matt Little, who will remember was part of Andy Murray’s team.

He’s out-shouting everyone at the moment - you can hear him loud and clear from the opposite end of the court.

An air shot. Amateur tennis players following you can all feel a little bit better about your own game as Carole Monnet goes for a smash, misjudges the wind, and completely misses the ball.

See. Even the pros do it.

Anyway, it gives Boulter a timely advantage on deuce and she wins the next point to hold.

Oooh, a really long rally and Katie Boulter finally makes it click on her forehand again, smashing a winner into the corner.

30-0, but once again the Briton loses momentum, and soon it's deuce on her serve.

A couple more Boulter errors and Monnet limps to a hold.

A wide forehand from Boulter means Monnet saves the second.

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Another double-fault and suddenly Katie Boulter has two break points.

Carole Monnet saves the first.

Katie Boulter is pumping her fist again, looking far more relaxed. 15-30.

Boulter has found her form. She holds to love thanks to another sprinkling of Monnet errors.

Annabel Croft
Former British number one on BBC Radio 5 Sports Extra and BBC Sounds

I think Katie Boulter plays with quite a solid base when she plays on hard court. On clay court, it looks like she just feels less secure and she isn't quite as balanced.

She can't really change direction as well as on hard court - and movement has always been Katie Boulter's weakness, hasn't it.

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Katie Boulter breaks at the first attempt, just as she did at the start of the second set.

It comes from another Carole Monnet error. Now, can the Brit back it up with a hold?

And Boulter takes it, or rather Monnet makes an error, hitting a forehand far too wide.

Catch in the crowd! Howzat?

Carole Monnet slices a backhand horribly off target to slip to 30-30. A half-chance for Boulter coming up...

More like it from Katie Boulter. She starts the second set with a hold to 15.

Annabel Croft
Former British number one on BBC Radio 5 Sports Extra and BBC Sounds

This is just extraordinary. There was no comparison before between the two players and I would have almost put my house on Carole Monnet not being able to get that first set under her belt.

But it is amazing what a Parisian crowd can do - they can lift a player, they can get on top of the other player and the whole thing can shift.

The level drop from Katie Boulter was quite extraordinary. It is incredible what doubt does to a player when it creeps in as well.

Well I don't know what to think anymore. Katie Boulter looked dominant in the first part of that first set. She was serving for it at one point, but Carole Monnet has produced another level out of nowhere.

Katie Boulter hits a backhand wide. Carole Monnet takes the first set. The world number 231 leads the world number 38!

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Oh dear. Katie Boulter sends over her first double-fault. Set point.

Six points in a row for Carole Monnet whose deep serve is returned long.

Wait, what's this? Another overrule from the umpire, Monnet's serve was long - and then she messes up the second serve. 6-3 becomes 5-4.

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Monnet is riding on this wave of support. She gets a mini-break of her own.

3-0 becomes 3-3 after Boulter clips the net. Carole Monnet asks for more from the crowd at the change of ends. They're right behind her.