Nadal fires his way back to 30-30, towels down his grip to rid it of perspiration and then proceeds to miscue a forehand. That was really off from Nadal, he's not found the sweet spot today.

Break point.

Image source, Getty Images

And again from the Argentine!

A fist-pump worthy forehand that stings the frame of Nadal and darts into the crowd once more, let's hope our man Jonathan Jurejko is taking cover up there...

15-30.

Jonathan Jurejko
BBC Sport at Roland Garros

We've already spoken about Schwartzman needing to be aggressive: here's a stat which illustrates his strategy. The Argentine has already racked up 14 winners, compared to two from Nadal, while also making 16 unforced errors.

Oh, hello. Whatever you can do...

Schwartzman responds with a passing winner of his own that whips beyond the Spaniard before he can shake a racquet at it.

15-15.

Image source, EPA

That's massive from Rafa Nadal, opening up the court and then leathering a forehand winner down the line and beyond the reach of a scampering Diego Schwartzman.

15-0.

Jonathan Jurejko
BBC Sport at Roland Garros

Thunderstorms? Pah. Chatrier is bathed in sunshine.

The brollies are left under seats and tucked away in bags, white panama hats the accessory of choice.

I'd estimate at least 80% of the seats in the sun are occupied by people channeling the style of that man who used to help sell a popular fruit juice in the 1980s.

Punishing from Nadal, just cranking through the gears when he needs to to salvage another break.

Image source, EPA

Two break back points for Rafa Nadal, and Diego Schwartzman shrugs in disbelief at the realisation he's given the world number one a crack at getting back into this first set...

Nadal looks determined to hit back immediately once more.

A fizzing backhand goes wide off Schwartzman's strings. He snaffles another into the net.

15-30.

We are just about getting under way on Court Suzanne-Lenglen in the last of the men's quarter-finals as Marin Cilic, the third seed from Croatia takes on Juan Martin del Potro, the fifth seed from Argentina.

Del Potro leads the head-to-head meeting 10-2 and this has been a surprisingly one-sided rivalry between the two former US Open champions, with Del Potro having won his last seven matches against Cilic, only dropping sets during that time in a thrilling 2016 Davis Cup final clash.

But the Croat is still one of the best players in the world, having lost both the Wimbledon and Australian Open finals to Roger Federer over the last 12 months. Cilic expects some lengthy sets between the two big servers: "You never know what's going to come. Obviously, you can expect one or two tie-breaks are going to happen."

Image source, Getty Images

Jonathan Jurejko
BBC Sport at Roland Garros

That shank from Rafa flew halfway up the lower tier of the Chatrier side stand. One bloke made a fumbled attempt to catch it, before a second man - like a reliable slip behind the cricket wicket - made sure the chance didn't go begging.

His throw back to the court left a bit to be desired, he still took a bow though. Not that many thought he deserved an ovation.

Brilliant, decisive tennis from Schwartzman.

The Argentine thinks he's earned the break with a thumping forehand that has Nadal on the run, but the world number one finds the strength to float it back from wide out.

No bother for the 11th seed, he's there to meet it at the net.

Schwartzman breaks.

The 11th seed isn't making it easy for the clay court champion.

Nadal drifts to 15-30 again, and then sends a wild backhand off his frame and into the Chatrier stands.

Two break points.

Image source, EPA

Successive Nadal forehands leap off the clay and Schwartzman struggles to deal with both the height and pace.

Nadal rattles a straightforward backhand from mid-court into the tape, though.

That's 15-15.

Lovely stuff from Scchwartzman. Digging into his box of tricks to disguise a backhand drop shot before looping a well-weighted lob over the world number one.

He holds to love.

Quick towel down and change of shirt for Rafael Nadal at the changeover. Schwartzman opts for the ice towel as things begin to hot up a little in Paris.

Baseball cap the wrong way like a tennis-playing Mighty Max, the Argentine slings a couple of peachy backhands down before drawing Nadal into the net.

The Spaniard can't quite make it. Schwartzman follows up with a fiery forehand winner.

30-0.

Image source, Getty Images

Rafael Nadal saves another break from the diminutive Argentine and Diego Schwartzman then punches a forehand long. Rafa holds.

Image source, .

Right, let's go straight over to Chatrier and join this one...

So it will be world number one Simona Halep who faces Spain's Garbine Muguruza in the French Open last-four.

The winner will face an American in the final, either Sloane Stephens or Madison Keys...

Image source, Reuters

Jonathan Jurejko
BBC Sport at Roland Garros

Ah, that didn't last long. Schwartzman doesn't heed the first rule of tennis: back up your break with a hold.

As you were.