After two games without a point, Cristian Garin gets himself on the board with a nerve-settling hold to 30 on the board. Djokovic still with the break though.

Jonathan Jurejko
BBC Sport at Wimbledon

Huge roar of encouragement for Cristian Garin as he wins his first point of the match in the third game. That lifted the Chilean, who then whacked down a first serve with his next effort.

Before this service game there were a few shouts of 'Vamos Cristian', suggesting plenty of his Chilean cousins are here.

Ash Barty responds with a long, loose forehand of her own, which takes us to deuce.

Ooh, that's long from Krejcikova, too much on a forehand, and it's set point to Barty...

A great get from Barty, pushed out wide, surprises Krejcikova, who pushes a forehand into the net.

We're seeing a few more errors from the Czech now, a backhand swirling long, but she's on the board with a big first serve for 15-30.

Barty gets a second serve to look at and does nothing with it. 30-30.

Cristian Garin would have been dreaming last night of causing a shock against Novak Djokovic. Now the reality has kicked in, 2-0 Djokovic, who has not lost a single point yet.

Peter Odgers
BBC Sport commentator

It's bit more of a rhythm on serve for Barty. She backs up the break. It has looked uncomfortable at times, but somehow the Australian has found a way.

Ash Barty has never gone beyond the fourth round here at Wimbledon, although she did win the girls' singles title here in 2011.

Here's Krejcikova...

Ash Barty is still not looking entirely comfortable as she's undone at the net to fall 15-30 behind.

A first serve that Krejcikova bunts long takes her to 30-30, before an ace and another error on return from the Czech takes her to a hold.

Krejcikova will have to serve to stay in this first set...

We're heading to a fifth-set decider over on court 18!

Russian 25th seed Karen Khachanov fails to hold serve and loses the chance to wrap up victory against world number 50 Sebastian Korda in a fourth-set tie-break.

The 21-year-old American Korda responds to losing the last two sets with a crucial break to take it 7-5.

Who will take this now and march on to the quarter-finals?

Jonathan Jurejko
BBC Sport at Wimbledon

It'll be interesting to see/hear what reception Novak Djokovic receives today as he returns to Centre Court.

After going for a day trip to Court One on Friday, he was left frustrated by the crowd there getting behind his opponent Denis Kudla.

That fed further into the belief that five-time champion Djokovic is still not loved here at Wimbledon.

His entrance today was marked by a fond applause.

Cristian Garin makes his Centre Court debut by being broken in his first service game, Djokovic breaking to love.

If these are big-match nerves, Garin has to sort himself out quickly or this is a routine few hours ahead for Djokovic.

His match against Cristian Garin is just about to get under way, with Garin having won the toss and will serve first.

And speaking of Novak Djokovic...

Hungarian world number 48 Marton Fucsovics has taken the first set against fifth seed Andrey Rublev.

The winner of this one will play Novak Djokovic or Cristian Garin.

Into the net goes the Krejcikova backhand!

We're back on serve.

Now that is nerves!

Krejcikova has the simplest of volleys to make but she just snatches at it and the ball goes flying into the top of the net.

Another chance for Barty...

Oh!

Krejcikova approaches the net and a hurried Barty swirls a backhand into the tape.

Krejcikova is now struggling to find her own first serve and a stonking winner down the line from Barty gives her break back point...

Anne Keothavong
Former British number one on Tennis Breakfast

I have been impressed by Krejcikova. We haven't seen her on grass before but she seems to be handling the occasion well, seems to have a good gameplan out here.