Image source, EPA

Angelique Kerber has won the first set against world number one Simona Halep.

The German took it 7-2 on a tie-break after an opening set that had swung one way and then the other.

Kerber is still yet to drop a set in this tournament.

Three games in set two and no-one has held their serve.

Muguruza seemed to be losing her grip on the match, well, only for a couple of minutes.

She immediately breaks back, leaving Sharapova once again with a mountain to climb.

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Great stuff from Garbine Muguruza, who moves to a break point. Any hopes of a Sharapova fightback might not be lasting too long at all.

Philip Studd
BBC tennis reporter at Roland Garros

Whatever you think about Sharapova you have to admire her tenacity. She has the ability to turn things around and the result is not a foregone conclusion just yet.

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The fightback starts here? Maybe.

Sharapova breaks the Muguruza serve with a game to love. Just what the Russian needed. Just what this match needed.

"Come on," is the scream from Sharapova after moving 0-40 ahead in game two.

Sharapova needs to sort this out quickly, and winning the first two points of the second game gives her a half chance for an immediate break back.

A mammoth first set between Simona Halep and Angelique Kerber is going to a tie-break.

Three breaks apiece in the opening set of their quarter-final - does anyone want to hold serve?!

Muguruza had two break points, she only needs one. Just like in set one, Maria Sharapova's serve is broken straight away.

Complete dominance from the third seed at the moment. One set up, one break up. superb stuff from her.

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A lovely two-handed forehand from Muguruza, crouching down low, is positioned perfectly to give the Spaniard two break points.

Mike Dickson
Daily Mail tennis correspondent on BBC Radio 5 live sports extra

I don't think anyone would have predicted the one-way traffic there was at stages in that first set. I wonder if Sharapova has been slightly upset by the massively disappointing withdrawal of Serena Williams and the lack of action for four days. Maybe she got caught cold a little bit.

Muguruza is hitting the ball beautifully, very clean and flat and pushing Sharapova wide to expose her sometimes not very silky movement.

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The second set starts off like the first did, with Muguruza putting pressure on the Sharapova serve by taking the opening two shots. 0-30

Cat Archer
BBC Radio 5 live at Roland Garros

Today for the crowds here at Roland Garros, a chance to try their hand at wheelchair tennis. We’ve got a very strict man leading half in relay races around cones while others attempt rallies. The wheelchair tournament starts here in Paris tomorrow.

Image source, Cat Archer

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It's turning into a right sizzler over on Court Suzanne Lenglen.

Angelique Kerber broke Simona Halep twice in quick succession, only for the world number one to recover to 5-5.

But Kerber has just broken again. And now the German can serve for the first set...

The first serve is out, the second helps her create a good position for Muguruza to hit it deep and Sharapova can only send her next shot halfway up the net.

Muguruza is halfway there to the semi-finals. Sharapova needs to raise her game quickly.

Image source, Gett

One set point saved, one remains.

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Set point for Muguruza after one of the shots of the opening set, a beautiful two-handed backhand down the line leaves Sharapova sprawling.

Two fine serves gives Muguruza a 30-0 lead, again two shots from a one-set advantage.

And Simona Halep breaks again!

Having gone 4-0 down, the world number one has pulled the first set of her quarter-final with Angelique Kerber back to 5-5.

Anonymous: First Grand Slam memory and what got me into tennis was the 2004 Wimbledon final where Sharapova beat S.Williams. Sad she cast a shadow over her talent and credibility. Muguruza to win hopefully, really like her!