Tracy Austin
Former Wimbledon mixed doubles champion

Konta is playing so well, I've been impressed with how she she has come up so quickly. Two or three years ago we didn't know she was. She then broke into the top 10 and she manages the situation so beautifully.

Wow. Three break points for Johanna Konta come whizzing up in no time, some meaty forehands on show as she takes on Garcia's serve.

Garcia saves the first as she comes darting to the net, but she overworks a return long on the second. The first blow goes Konta's way!

* denotes next server

Image source, Reuters

Here we go. A final slurp of water for Garcia while Konta fiddles with his wristbands. A big cheer goes up for the Brit as she takes her place on court.

It'll be Caroline Garcia to serve first.

Pristine hitting from Angelique Kerber to open up her service game - still on serve in this second set. And the German holds in double quick time. Tie break situation?

Konta's opponent, Caroline Garcia, is not to be messed with.

She hasn't dropped a set at Wimbledon so far and she's lost just 16 games en route to the last 16.

And she's got a long-time fan in the shape of the world number one, as this tweet from 2011 shows...

Annabel Croft
Former British number one on BBC TV

Garcia has a big serve, big ground strokes and aggressive return of serves. She is similar to Konta but I'd say Jo does everything just a little bit better.

There will be some pressure building on Konta but she has processes, formula and mindset that she applies to every match and that's what has impressed everybody. She only worries about whatever she can control.

French Open champion Jelena Ostapenko is serving for the match against Elina Svitolina, the fourth seed from Ukraine.

The key to Johanna Konta's success this year? Homework.

According to coach Wim Fisette in this interview, external with the Evening Standard, Konta commits tactics to memory the night before a match, and recites it to Fisette before taking to court.

"You could say it is like a little exam and maybe a bit unusual but when she is 100 per cent clear about her intentions, that is when Jo plays her best matches," Fisette told Tom Allnutt.

"There are matches sometimes when I feel she is not completely clear and that is when it gets tough."

Image source, Reuters

Louise Pleming
Former professional tennis player

So many of the past champions have all practiced against a brick wall, Martina Navratilovaalways talks about how she played against brick wall, Roger Federer as well. But unfortunately in our countrysides we are losing the brick walls, they are being knocked down, particularly in Australia.

We are into a deciding set over on court 18, and it could be the biggest set in the lives of world number 87 Magdalena Rybarikova and Petra Martic, who is ranked 135th.

Neither player has ever made the quarter-finals of a Grand Slam with Rybarikova taking the first set 6-4, before Martic stormed through the second set 6-2.

Image source, Getty Images

Baking and tennis are two of my favourite things. Excellent work from the British number one here before her match against Caroline Garcia...

App users may need to click 'view more' to see the above content

Whoever wins this match will take some stopping for the rest of the week. Muguruza is frustrated with herself again after pushing another forehand wide. When it's good, her game is so good. Just too many errors are preventing her from taking the lead in this set.

Kerber stays in the game on the end of some relentless hitting, as we go to a second deuce. Break point for Muguruza, again, Kerber stays alive!

Court 12 is packed out, and it's not surprising - they're watching a Grand Slam winner in Ostapenko, and a fiesty opponent in Svitolina.

It's the French Open champion who is cruising in this second set, though. She's a game away from a place in the quarter-finals.

Image source, EPA

Watch number one seed Angelique Kerber take the first set after a great rally with Garbine Muguruza.

Image source, Getty Images

Muguruza misses a volley at the net, I'm sure she would have missed that on Centre Court as well. 15-30 on her serve, second serve, a big point in the set and she wins it with a good overhead get on her backhand side.

Then a poor drop shot attempt, into the net, gifts Kerber a break point. What's going on here? The umpire has to come down and escort one of the ball boys off the court to rich applause.

Unwell? A touch of heat stroke I think. Muguruza rallies to win a fine rally at the net, a huge roar. And she holds with a punchy backhand winner!

Image source, Getty Images

Louise Pleming
Former professional tennis player

Muguruza needs to be aggressive but also needs to build the point. She's just been too impatient today.

BBC Radio 5 live

Wimbledon chief executive Richard Lewis on today's scheduling conflicts: "It’s very hard today, in 2017, to argue against the big four being on Centre and Court One.

"You’ve got the four top male players who, in this golden era of men’s tennis, are very hard to take beyond Centre and Court One.

"I think there’d be more controversy if Novak Djokovic was on number two court, for the kind of reasons you’re suggesting. I absolutely accept Kerber v Muguruza is a fantastic match, no ifs or buts about that, and on many days that would be a Centre or Court One match.

"We showcase the very best talent in the women’s game unlike any other tennis event. We have a standalone ladies' day when, quite rightly and we’re very proud of it, the women take centre stage.

"They were tough, close decisions. We are very proud that ladies take centre stage, as they should on the second Tuesday, second Thursday and on finals day."

It's a big talking point. Stand by for some answers...

19 winners, 25 unforced errors for Muguruza so far. She's going for the pin every time and it's evening itself out pretty much.

Kerber looks much more solid. Not as flamboyant maybe but she can still hit a winner from anywhere on the court.

Kerber holds with the bare minimum of fuss.

Image source, Getty Images

Watch this incredible winner from Svetlana Kuznetsova during her match against Agnieszka Radwańska.