Image source, Reuters

Alexander Zverev on playing in cooler conditions, with the temperature around 24C in Paris today which is 10C cooler than last week:

"I prefer when it’s hot to be honest. I like heat, I feel like my ball is a lot faster, everything is faster through the air and my opponents struggle more which is always nice.

“I spend a lot of time in Florida so I’m used to the heat and conditions. It’s like Germany here, it can change in one day, so I’m used to that and I like showing good tennis.”

Alexander Zverev on facing 19-year-old Spaniard Rafael Jodar in the quarter-finals:

"He is a very young player, incredibly talented, he's come on the scene this clay-court season.

"He's playing incredible tennis, it's going to be a very difficult challenge but I have to trust myself and I'll be ready for it."

Alexander Zverev speaking on court after his victory over Jesper de Jong:

"In the beginning it was a bit difficult, I didn't start off strong and he started really fast and well.

"But once I found rhythm I felt comfortable on court, and that's the main thing for me.

"I know my game is there and it's about showing it on match courts."

Alexander Zverev thought about a between-the-legs shot there but decided to leave the ball and it was the right decision as it dropped out.

Two points later and the German second seed has the double break with a superb forehand winner across court which Jesper de Jong can only admire.

Zverev will now serve for a place in the quarter-finals.

Relentless stuff from Alexander Zverev as he drags Jesper de Jong around the court amid a couple of unplayable passing winners.

In this form the German second seed is hard to stop.

Alexander Zverev is striking the ball so cleanly and arrows a forehand winner down the line.

Jesper de Jong does well to keep his nose ahead in the game though, and takes advantage of a loose Zverev drop by securing the hold next point with a strong first serve.

Alexander Zverev continues to serve well with Jesper de Jong unable to make any inroads.

The German second seed has had a dominant start to this third set and is sailing towards the last eight as it stands.

Image source, Getty Images

Eight points in a row for Alexander Zverev at the start of the third set and he has the all-important break of serve as he looks to close out a straight-set win.

There were a couple of superb winners in that game from the German, who watched a Jesper de Jong lob drift over his head and land out on break point.

A routine service hold to love at the start of the third set for Alexander Zverev, who has only dropped the one set on his way to the fourth round at Roland Garros.

If he can get this done in straight sets and conserve as much energy as possible for the rest of the tournament, that would surely only improve his chances of clinching that first major title.

Image source, Getty Images

Romanian 18th seed Sorana Cirstea is into the quarter-finals of the French Open for the second time in her career, 17 years after her first appearance in the last eight.

Her next opponent will either be Swiss player Jil Teichmann or Russian eighth seed Mirra Andreeva, who was just two years old when Cirstea first reached the French Open quarter-finals in 2009.

Teichmann and Andreeva have just got under way on Court Suzanne-Lenglen.

Alexander Zverev gets the better of a couple of rallies, forcing Jesper de Jong into mistakes as the German brings up two set points.

Zverev takes them at the first opportunity as De Jong is unable to return a rasping forehand into his toes.

Zverev upped his game there when it mattered and he is now one set away from the quarter-finals.

Annabel Croft
Former British number one on BBC Radio 5 Live

I've watched so many of Alexander Zverev's matches during his career and I actually do admire his work ethic - because I see what he does on the practice court and with fitness, and the team he's put around it - and I think he's so determined, and you underestimate him at your peril.

But he has put in some horror performances, interspersed with some amazing performances - even though he's been unbelievably consistent.

That serve problem and the forehand problem can rear its ugly head at any moment, and you just don't know when it's going to come, and that's what makes me doubt him a little bit for this title.

Alexander Zverev comes through his service game with little trouble as he wraps it up with an ace in holding to love.

Half a chance for Alexander Zverev at 30-30 as Jesper de Jong skews a slice into the net after a lengthy rally.

He gets out of trouble in the next point before securing the hold in style with a powerful forehand winner which leaves Zverev stranded.

Jesper de Jong is disappointed in himself as he misses a simple shot at the net, before firing a backhand long to give Alexander Zverev the hold.

I can't help but think of Lleyton Hewitt watching De Jong play, which is largely down to his backwards white cap.

Image source, AFP via Getty Images

Jesper de Jong thinks he's done enough with a powerful backhand across court but Alexander Zverev stretches to land a deft volley.

Zverev applies some pressure at 30-30 but De Jong gets out of trouble with a couple of strong first serves.

Alexander Zverev serves only his second double fault of the match after a rare wayward first serve in this set, but he recovers quickly to hold as Jesper de Jong skews a backhand return wide.

Russell Fuller
BBC tennis correspondent on BBC Radio 5 Live

My only 'likely' champion is Alex Zverev.

He has almost got over the line before, he has been a Grand Slam runner-up on three occasions - including here at Roland Garros - he's phenomenally consistent on tour, he is the second seed here and he's the world number three.

So he has a very, very good chance of finally winning that first Grand Slam.

Alexander Zverev cracks a forehand winner across court before Jesper de Jong fights back with a big ace down the middle.

Zverev smashes for break point after a delicate exchange at the net but De Jong saves it as the German drags a forehand wide.

De Jong comes through with a neat volley at the net to hold, before a relieved wipe of his forehead.