Boulter leads in tie-breakpublished at 16:37 British Summer Time 26 May
Monnet 6-6 (2-3) Boulter*
Great response from Carole Monnet, unfazed by that umpire overrule.
Two big serves later and she's cut the gap.
Summary
Second day of French Open in Paris
World number one Jannik Sinner beats Arthur Rinderknech 6-4 6-3 7-5
Italian playing at first Grand Slam since serving three-month doping ban
Britain's Emma Raducanu, Jacob Fearnley and Katie Boulter all progress to second round but Jodie Burrage out
Carlos Alcaraz through but ninth seed Emma Navarro thrashed
Boulter leads in tie-breakpublished at 16:37 British Summer Time 26 May
Boulter leads in tie-breakpublished at 16:37 British Summer Time 26 May
*Monnet 6-6 (0-3) Boulter
Clutch stuff from Katie Boulter. She gets a mini-break on Carole Monnet's serve and then hits a crisp forehand winner - her go-to shot.
Next point and Boulter hits a backhand down the line which gets a very late call of out by the line judge. The umpire is out of his chair and runs over to check. It's in he says, and Boulter gets the point!
Tie-break time!published at 16:34 British Summer Time 26 May
*Monnet 6-6 (0-0) Boulter
Carole Monnet goes long. Katie Boulter survives.
We go to a tie-break.
Image source, Getty Images'You have to admire the way Monnet has gone about her business'published at 16:34 British Summer Time 26 May
Monnet 6-5 Boulter*
Annabel Croft
Former British number one on BBC Radio 5 Sports Extra and BBC SoundsThis match has entered into very choppy waters, and who would have ever seen this coming?
The gulf of difference between the two players at the start of this match was very noticeable, but you have to admire the way Monnet has gone about her business here. She has always kept a smile on her face.
I think Monnet has unshackled herself in this match. She is starting to play with freedom, she is being more creative and she is starting to play intelligent tactical tennis. It has rattled Katie Boulter.
Game point Boulterpublished at 16:33 British Summer Time 26 May
Monnet 6-5 Boulter*
Second serve, but Monnet misses out. Slamming a forehand into the net. 40-30.
Boulter serving to stay in the setpublished at 16:33 British Summer Time 26 May
Monnet 6-5 Boulter*
Passing cross-court winner from Monnet. 30-30. This next point is huge.
Boulter serving to stay in the setpublished at 16:32 British Summer Time 26 May
Monnet 6-5 Boulter*
Katie Boulter needs all her mental strength here. She hits a loose forehand long to sink to 0-15, but then takes the next two points.
Monnet holds to lovepublished at 16:29 British Summer Time 26 May
Monnet 6-5 Boulter*
Carole Monnet has all the momentum - and the crowd behind her.
She wins a fierce rally at the net which pumps up the volume another notch.
Boulter then goes long, helping Monnet hold to love to take the lead for the first time in this match. It'll mean Boulter will have to serve to stay in the set.
Image source, Getty ImagesMonnet breaks backpublished at 16:27 British Summer Time 26 May
*Monnet 5-5 Boulter
Brilliant shot! We're all square again as Carole Monnet works on an angle and fires over a crisp, cross-court, forehand winner.
Break point Monnetpublished at 16:26 British Summer Time 26 May
Monnet 4-5 Boulter*
Wide with her backhand. How are Katie Boulter's nerves? 30-40.
'The way Monnet hits is quite deceptive'published at 16:25 British Summer Time 26 May
Monnet 4-5 Boulter*
Annabel Croft
Former British number one on BBC Radio 5 Sports Extra and BBC SoundsThe way that Carole Monnet hits the ball is a bit awkward, isn't it?
Sometimes she strikes it flatter and occasionally she just flicks her wrist a bit so there's a loopy height on the ball.
The way she hits is quite deceptive because you don't know if she is going to spin it, if it's going to land deep or if it's going to miss.
Image source, Getty ImagesBoulter serving for first setpublished at 16:25 British Summer Time 26 May
Monnet 4-5 Boulter*
Boom. Much better. Katie Boulter cries "come on" after her forehand has too much heat on it for Monnet to handle. 30-30.
Boulter serving for first setpublished at 16:25 British Summer Time 26 May
Monnet 4-5 Boulter*
Ah, what was I saying about being locked in? Katie Boulter hits an overhead smash into the net, and then finds the net again with a forehand. 15-30.
Boulter serving for first setpublished at 16:23 British Summer Time 26 May
Monnet 4-5 Boulter*
That'll do for Boulter. Carole Monnet slices a backhand wide. 15-0.
Boulter doesn't flinch. She looks locked in the zone.
Image source, Getty ImagesMonnet holdspublished at 16:21 British Summer Time 26 May
Monnet 4-5 Boulter*
Carole Monnet is hanging in there. A brilliant drop-shot helps her hold to 15.
If Katie Boulter wants this first set, she'll have to serve for it.
Monnet serving to stay in setpublished at 16:20 British Summer Time 26 May
*Monnet 3-5 Boulter
Here we go. Crunch time in this first set.
Katie Boulter slams her first return into the net and then skids a backhand wide. 30-0.
'Something has flicked a switch on Boulter's clay court ability'published at 16:19 British Summer Time 26 May
*Monnet 3-5 Boulter
Annabel Croft
Former British number one on BBC Radio 5 Sports Extra and BBC SoundsI just feel like Katie Boulter will have too much weight on the ball for Carole Monnet.
She has won all of those matches on clay in the build-up to this so it's almost like something has flicked a switch on her clay-court ability these days.
It was quite smart to go and play at that event in Paris to get some match wins under her belt, it has completely changed how she looks on the court in comparison to Madrid and Rome.
Image source, Getty ImagesBoulter holdspublished at 16:18 British Summer Time 26 May
*Monnet 3-5 Boulter
Katie Boulter's forehand is looking fabulous right now. She winds up another winner into the corner, and then backs it up by staying in a rally and forcing Monnet into an error.
Boulter is dominating this first set, and holds to 15 to continue her march.
Monnet holds to stop slumppublished at 16:14 British Summer Time 26 May
Monnet 3-4 Boulter*
Defence of the highest quality keeps Carole Monnet in back-to-back rallies, and possibly this first set too.
She holds to 15 in a game which includes the French qualifier hitting just her second winner of the match, a delicious passing forehand down the line.
Boulter holdspublished at 16:10 British Summer Time 26 May
*Monnet 2-4 Boulter
Ah, the two sides of Carole Monnet. She plays a brilliant return of serve which clips the baseline and Boulter can only return it up, high into the air.
But then Monnet, sprinting forward, places her overhead smash wide. Criminal!
A missed opportunity at love-all, and Boulter ends up holding to love.