Play suspended for the day because of rain
Argentine Schwartzman leads Nadal 6-4 3-5 in quarter-final
Nadal's first set dropped at Roland Garros since 2015
Cilic v Del Potro in first set tie-break
Halep defeats Kerber 6-7 6-3 6-2
Muguruza beats Sharapova 6-2 6-1 - will face Halep in Thursday's semi-finals
Halep 6-7 (2-7) 6-3 6-2 Kerber
The Romanian quells a ripple of applause, and responds to the Angelique Kerber serve with a fierce return.
The German reaches it, but sends it long... that's it. Halep storms into the semi-final.
Image source, Getty ImagesHalep 6-7 (2-7) 6-3 5-2 Kerber*
And Halep brings up match point.
Nadal 1-2 Schwartzman*
Jonathan Jurejko
BBC Sport at Roland Garros
How do you beat Rafael Nadal over five sets at Roland Garros? Robin Soderling is one of only two men who knows the answer.
The Swede told BBC World Service recently that you have to be "extremely aggressive" - Diego Schwartzman is doing exactly that...
...and it leads to the first break of the match. Chatrier stunned.
Halep 6-7 (2-7) 6-3 5-2 Kerber*
Great depth from Simona Halep, finding the corner and forcing Kerber into the net.
The German sends the next one long. 30-30.
Halep 6-7 (2-7) 6-3 5-2 Kerber*
Angelique Kerber serving to stay in the championship.
She pops in a crunching serve to make it 15-0, and then follows up a looping second serve with a mammoth forehand winner for 30-0.
Halep 6-7 (2-7) 6-3 5-2 Kerber*
Ouchy, that was wild from Angelique Kerber, stumbling into a two-handed backhand and slinging it off the frame towards a line judge.
She flops a sloppy return long. Simona Halep holds.
Image source, Getty Images*Halep 6-7 (2-7) 6-3 4-2 Kerber
Not quite finding the baseline, Halep. She pops another just beyond the whites of Kerber's end but rattles down a furious response to make it 30-30.
*Nadal 1-1 Schwartzman
Jonathan Jurejko
BBC Sport at Roland Garros
Now it is the turn of Diego Schwartzman's serve to creak.
Rafael Nadal takes the Argentine's first service game to deuce, spurning two break points before Schwartzman emerges unscathed.
Twenty minutes for the opening two games between these two - Garbine Muguruza didn't need too much longer to win the entire second set against Maria Sharapova on Chatrier in the previous match.
*Halep 6-7 (2-7) 6-3 4-2 Kerber
Ear-shattering effort from Simona Halep as she jumps into every stroke, but punches a forehand long.
Angelique Kerber is hanging in on each point and forcing the Romanian to play winners.
Halep obliges with a mammoth forehand.
Image source, Getty Images*Halep 6-7 (2-7) 6-3 4-2 Kerber
Halep overcooks a backhand and Kerber then lashes down a fierce forehand.
That's 40-15.
A big ace to hold for the German.
Halep 6-7 (2-7) 6-3 4-1 Kerber*
Simona Halep is within touching distance of the French Open semi-final...
The two-time runner-up takes the first point on the Kerber serve, but can only stick a frame on a well-disguised forehand from the former world number one.
15-15.
Great Britain's Dan Evans has moved into the quarter-finals of the Surbiton Trophy in Surrey with a 7-6 (7-4) 6-3 win over Germany's Mats Moraing.
Evans, 28, was as high as 41st in the world rankings in March 2017 before being suspended for 12 months after testing positive for cocaine in April 2017.
His current position in the rankings is 858th, but he will significantly jump up the standings after his win over the world number 153.
Evans, the last British player left in the men's singles in Surrey, will play 37-year-old Jurgen Melzer of Austria, who reached the semi-finals of the French Open back in 2010.
However, Melzer is now ranked 1,245th after three injury-ravaged seasons that have seen him suffer lengthy absences because of serious shoulder, hip and elbow injuries.
Image source, Getty ImagesHalep 6-7 (2-7) 6-3 4-1 Kerber*
Wonderful forehand winner from Simona Halep, whipping it down the line like a daisy-cutter. That barely left the ground.
Halep holds.
Nadal 1-0 Schwartzman*
Jonathan Jurejko
BBC Sport at Roland Garros
We're going to have a hell of a match here if Diego Schwartzman can keep this up.
The 11th seed pushes Rafael Nadal all the way in the opener, missing four break points before the world number one digs himself out of a hole.
*Halep 6-7 (2-7) 6-3 3-1 Kerber
Angelique Kerber can't muster the strength to lift a backhand beyond the net.
Simona Halep breaks.
Halep 6-7 (2-7) 6-3 2-1 Kerber*
It's another chance for Halep, as she roars in anticipation after Kerber's swerving forehand ripples the tape and drops wide.
Tense.
Halep 6-7 (2-7) 6-3 2-1 Kerber*
The first cracks the net, a little too much power, not enough precision from the Romanian.
Kerber saves the second, too.
Deuce.
Halep 6-7 (2-7) 6-3 2-1 Kerber*
Kerber drops from deep, Halep scuttles and then slides in to meet it with a backhand winner.
Is there anything more satisfying than watching a slide on clay?
Two break points for Halep.
Halep 6-7 (2-7) 6-3 2-1 Kerber*
Fingers crossed for the 19%.
Meanwhile, it's raining massive forehand on Lenglen. Halep takes the opening exchanging, with Kerbe thundering down an even bigger winner in response.
15-15.
Halep 6-7 (2-7) 6-3 2-1 Kerber*
Kerber slips her shoes back on after a medical time out. She needs to hurry up as there's an 81% chance of rain in the next five minutes, I'm told...