French Open quarter-finals - listen to live radio commentary at top of page
Top seed Aryna Sabalenka beaten 3-6 7-5 6-0 by Diana Shnaider
Sabalenka led 6-3 4-1 and served for match before Shnaider fought back
Russian will play qualifier Maja Chwalinska, who stunned Anna Kalinskaya 7-6 (7-3) 6-3 to continue dream run
Chwalinska is sixth woman in the Open era to reach a Grand Slam singles semi-final as a qualifier
Followed by: Felix Auger-Aliassime v Flavio Cobolli in men's quarter-finals
Italians Matteo Berrettini and Matteo Arnaldi go head-to-head in night session (not before 19:15 BST)
Sabalenka 6-3 5-7 0-6 Shnaider
Diana Shnaider won 12 of the final 13 games to win from 6-3 4-1 down.
The Russian 25th seed goes on to face Polish qualifier Maja Chwalinska.
One of those two players will contest the French Open final.
It has been a tournament full of unforeseen surprises - but that huge shock that we have just seen surely has to be the biggest.
Sabalenka 6-3 5-7 0-6 Shnaider
Russell Fuller
BBC tennis correspondent on BBC Radio 5 Sports Extra
Did anyone see that coming? Aryna Sabalenka is walking off the court immediately.
Sabalenka 6-3 5-7 0-6 Shnaider
The world number one crashes out at Roland Garros!
Goodness me.
Diana Shnaider is through to her first major semi-final after a quite astonishing turnaround on Court Philippe Chatrier.
*Sabalenka 6-3 5-7 0-5 Shnaider
Naomi Broady
Former British player on BBC Radio 5 Sports Extra and BBC Sounds
Aryna Sabalenka is completely dejected. She is battling with herself to stay in this match.
A tiny drop off mentally from Sabalenka when she was up in the second set. She left the door open slightly and Diana Shnaider has grabbed it with both hands.
Shnaider is now the better player.
*Sabalenka 6-3 5-7 0-5 Shnaider
I'm remending you all as much as myself with these stats.
That's 11 of the last 12 games against Aryna Sabalenka from 6-3 4-1.
In no time at all, Diana Shnaider has three match points...
*Sabalenka 6-3 5-7 0-5 Shnaider
Russell Fuller
BBC tennis correspondent on BBC Radio 5 Sports Extra
We almost need to rub our eyes as we look at that scoreboard. This has been one of the most extraordinary sporting turnarounds.
*Sabalenka 6-3 5-7 0-5 Shnaider
Diana Shnaider is almost there!
The Russian 25th seed is just one game away from a once unthinkable victory.
Aryna Sabalenka needs to produce something very special here, and that is not looking likely at all.
Sabalenka 6-3 5-7 0-4 Shnaider*
Naomi Broady
Former British player on BBC Radio 5 Sports Extra and BBC Sounds
Aryna Sabalenka has gone for another racket change...
She is ripping off the plastic of the new grip.
Sabalenka 6-3 5-7 0-4 Shnaider*
Aryna Sabalenka changes her racquet at the change of ends, but it feels like a lot more than that needs to change here.
In stark contrast to her faltering opponent, Diana Shnaider is oozing confidence and rattles a forehand down the line as she makes progress on serve.
Sabalenka 6-3 5-7 0-4 Shnaider*
Russell Fuller
BBC tennis correspondent on BBC Radio 5 Sports Extra
These are really inexplicable errors from Aryna Sabalenka.
Sabalenka 6-3 5-7 0-4 Shnaider*
Image source, Getty ImagesThat's one game in 11 for Aryna Sabalenka.
A 53rd unforced error costs her this latest one.
It has all unravelled astonishingly quickly for the world number one. She has no idea what to do here.
*Sabalenka 6-3 5-7 0-3 Shnaider
What on earth has happened to Aryna Sabalenka?!
The top seed crouches to the ground and rests her head on her racquet for a second as she tries to gather herself after losing the first point on her serve.
There's no two ways about it. She absolutely has to hold serve here.
*Sabalenka 6-3 5-7 0-3 Shnaider
Naomi Broady
Former British player on BBC Radio 5 Sports Extra and BBC Sounds
Right now, the uplift in the level by Diana Shnaider has taken Aryna Sabalenka by surprise.
I am almost at the point where I am a bit speechless.
*Sabalenka 6-3 5-7 0-3 Shnaider
The alarm bells really are ringing now for Aryna Sabalenka.
At a tournament where we have seen so many of the title favourites suffer shock early exits, this would be one of - if not the - biggest.
Diana Shnaider is locked in and holds without issue for a 3-0 lead in the third set.
Sabalenka 6-3 5-7 0-2 Shnaider*
Naomi Broady
Former British player on BBC Radio 5 Sports Extra and BBC Sounds
It feels like Diana Shnaider is beating Aryna Sabalenka at her own game.
Sabalenka is desperately trying to hang on here. She is not making it easy.
Shnaider is up for this!
Sabalenka 6-3 5-7 0-2 Shnaider*
Image source, Getty ImagesA fourth break point for Diana Shnaider in this marathon game.
With each point played, it feels like this the match right here...
And Shnaider has taken it! The Russian pops away a forehand winner and has now won EIGHT of the last NINE games.
Incredible. The world number one is on the ropes.
*Sabalenka 6-3 5-7 0-1 Shnaider
A 47th unforced error from Aryna Sabalenka on game point.
And Diana Shnaider responds by drawing another error from the world number one for break point number three.
Incredibly tense moments on Court Philippe Chatrier.
*Sabalenka 6-3 5-7 0-1 Shnaider
Another poor miss from Aryna Sabalenka, this time on game point, further adds to the top seed's frustration.
She unleashes an almighty roar after driving in an angled forehand winner to move back within touching distance of an escape.
*Sabalenka 6-3 5-7 0-1 Shnaider
Naomi Broady
Former British player on BBC Radio 5 Sports Extra and BBC Sounds
Aryna Sabalenka realises she needs to calm things down emotionally a little bit.
However, Sabalenka is furious again and she's looking at her coaching team to say; 'I don't know how to get myself out of this.'
These dark clouds seem to be edging towards us. I don't think Sabalenka would mind if the roof got shut.
*Sabalenka 6-3 5-7 0-1 Shnaider
Shottt! Diana Shnaider finds another winner to force a break point.
Aryna Sabalenka survives, but she'll have to face another after the Russian fires in her latest forehand winner cross-court...
