Ash Barty slaps her thigh in frustration as she sends a forehand long but she wins a glorious bit of net play, sending over a lob that Barbora Krejcikova can't return.

Krejcikova winds up and slaps a forehand through Barty's defences before fluffing a simple volley at the net.

Ooh, hello. Nerves? Krejcikova double faults and we're at deuce.

We're up to 75% capacity of Centre Court today, rising to 100% from tomorrow.

Centre holds 14,979 so that's more than 11,200 that can be there today. Getting closer and closer to some sense of normality.

Eighth seed Karolina Pliskova is facing Russian Liudmila Samsonova in her fourth-round match on court 12.

It's 3-2 on serve in the first set to the Czech.

Cristian Garin is 20th in the world and the 17th seed, but before this year had never won a match at Wimbledon.

He lost in the first round here in 2017, 2018 and 2019 but has now reached the last 16 at back-to-back grand slams after doing likewise at the French Open.

The 25-year-old from Chile has only played Djokovic once, losing 6-3 6-3 in the ATP Cup on an outdoor hard court in Australia last year.

Katie Falkingham
BBC Sport at Wimbledon

Ash Barty will be relieved with that hold. Awkward murmurings flooded Court One as she made double fault after double fault.

Anne Keothavong
Former British number one on Tennis Breakfast

What a response from Barty.

That's more like it from the world number one. Better intensity.

Wallop. Ace from Barty.

The top seed has the advantage and this time she holds as Krejcikova pushes a return of serve into the net.

Barty's serve isn't working well at all but she sends a forehand ripping past Krejcikova to move to game point.

And we're going to keep on going as a horrid shank comes flying off Barty's racquet. She turns and mutters to her box in frustration.

Novak Djokovic believed he was not at his best despite a straight-sets win over Denis Kudla in the third round.

The world number one extended his winning streak in grand slams to 17 matches and took another step towards a sixth Wimbledon crown, the third leg of the calendar-year grand slam, and a record-equalling 20th major title.

Djokovic can even still emulate Steffi Graf in 1988 when she won all four grand slams and gold at the Olympics – a feat yet to be repeated.

But Djokovic, who made 28 unforced errors against Kudla, said: "I can’t say I’m too pleased with the way I performed. I was a bit off, especially with serving."

Watch how Djokovic sealed a 6-4 6-3 7-6 (9-7) win over Kudla here.

Service winner from Ash Barty, for what feels like the first time in a while.

Ooft. That's rough. Another double fault, and we're back at deuce.

A lengthy rally, and it's Barty who comes out on top with a jabby forehand winner!

Deuce.

Ash Barty coughs up her third double fault of the set before she responds with a flat backhand that Krejcikova, approaching the net, can do nothing with.

That's long on the forehand, though, and Barty will have to try and stave off a break point...

Heather Watson and Harriet Dart have just exited the women's doubles at the last-16 stage after Chan Hao-ching and Latisha Chan fought back from a set down to clinch victory.

Former British women's number one Watson and compatriot Dart took the first set 6-4 in front of the home fans on court 14, but the Taiwanese sisters gathered their composure to win the second set 6-2.

The British pair struggled for rhythm in the decider as the seventh seeds booked their place in the quarter-finals with a comfortable 6-2 win.

Anne Keothavong
Former British number one on Tennis Breakfast

When a player has a greater perspective on life, they have a greater appreciation for their tennis, and th journey. That's what Krejcikova has got.

Success on the singles court has come quite late in her career - at the age of 25 making her main draw debut at the event.

Shot! Barbora Krejcikova is so solid on serve, firing a backhand winner beyond Ash Barty to move to 40-0.

She gives away an easy point with a snatch of a forehand that hits the net tape but another beautiful pick up, this time off her toes, hurries her to a hold.

That's the doubles experience coming out...

Peter Odgers
BBC Sport commentator

Beautifully done from Barty with the wondrous slice backhand she has. Stops the rot - first game in four for the Australian

Katie Falkingham
BBC Sport at Wimbledon

A LOT of appreciation from the crowd for that backhand. Inch perfect.

Ash Barty comes out on top in the battle of the slice backhands but her first serve has picked an awkward moment to go missing.

She trips into a double fault for 15-15 and is lucky that a passing shot by Krejcikova goes over the baseline.

Barty ends the run of games against her with a glorious spinny backhand that lands right in the corner of the court.

Barbora Krejcikova comes racing out to a 40-0 lead and a wallop of an ace out wide hurries her to a hold.

BBC Two

Whack on BBC Two to follow this battle on Court One.

There's also commentary available on BBC Radio 5 Live.