Andy Murray wins 4-6 6-3 6-2 6-4 against James Duckworth on Centre Court
Emma Raducanu beats Alison van Uytvanck 6-4 6-4
Novak Djokovic wins 6-3 3-6 6-3 6-4 against Kwon Soon-woo
British number one Cameron Norrie beats Pablo Andujar 6-0 7-6 6-3
GB's Yuriko Miyazaki and Jodie Burrage beaten in women's singles
Seventh seed Hubert Hurkacz defeated by Davidovich Fokina
Norrie 6-0 7-6 (7-3) 5-3 Andujar*
We're getting ready for what could be a quick conclusion to the Cameron Norrie v Pablo Andujar match.
Norrie is two sets up, 5-3 ahead in the third and it's deuce in the ninth game.
This match may be done in two points. Norrie has already missed three match points.
*Djokovic 6-3 3-6 6-3 4-3 Kwon
Kwon whirls over his seventh drop shot winner to move to 40-15 and he holds as Djokovic blazes a forehand into the net.
Djokovic 6-3 3-6 6-3 4-2 Kwon*
Kwon appears to be starting to tire and Djokovic is stepping it up, a tough combination as far as the former is concerned and the defending champion swashbuckles his way through this game in no time.
*Djokovic 6-3 3-6 6-3 3-2 Kwon
We've been going for over two hours now and Djokovic appears to be starting to turn the screw as he breaks serve against Kwon.
A decent rally to start off the fifth game of this set, with Djokovic taking the first point as Kwon's return goes wide. Djokovic then produces a delicate shot that drops just over the net and although Kwon gets to it, he can only hit the ball into the net.
Another rally ends with Kwon sending a backhand wide to hand the game to Djokovic.
Djokovic 6-3 3-6 6-3 2-2 Kwon*
But Djokovic responds in style to take the next game without dropping a shot.
On we go.
*Djokovic 6-3 3-6 6-3 1-2 Kwon
The applause levels rise as Kwon Soon-woo continues to make an impression, taking the next game on serve as Djokovic hits a return into the net before the defending champion then fails to get the ball over after being caught wrong-footed by a neat flick by his South Korean opponent.
Djokovic 6-3 3-6 6-3 1-1 Kwon*
Tim Henman
Former British number one on BBC TV
Kwon Soon-woo's hitting from the back of the court has been very impressive, as have his drop shots.
Djokovic 6-3 3-6 6-3 1-1 Kwon*
Andrew Castle
BBC Sport tennis commentator on BBC TV
It's almost as if Novak Djokovic needs a crisis in the match in order to truly motivate him and get him moving sharply - it's been a fairly flat performance and Kwon Soon-woo is totally in this.
Djokovic 6-3 3-6 6-3 1-1 Kwon*
Oh!
That's a chance gone begging for Kwon, who gets Djokovic right where he wants him and then floats the volley into the net tape.
Djokovic, under some strife, holds.
*Djokovic 6-3 3-6 6-3 0-1 Kwon
Kwon produces two wonderful shots, first a forehand then a volley, and ends up rooted to the spot as Djokovic finds a superb lob to beat him.
Djokovic is in front on his serve for the first time.
*Djokovic 6-3 3-6 6-3 0-1 Kwon
Ace!
Deuce again.
*Djokovic 6-3 3-6 6-3 0-1 Kwon
Hello, another chance for Kwon as Djokovic wallops a forehand way long...
*Djokovic 6-3 3-6 6-3 0-1 Kwon
Kwon gets a look at a Djokovic second serve, and he plants it into the net!
He should have done better with that and he knows it. Deuce.
*Djokovic 6-3 3-6 6-3 0-1 Kwon
Great serve from Djokovic to save the first break point.
It's still 30-40 though...
*Djokovic 6-3 3-6 6-3 0-1 Kwon
Djokovic gets outmuscled on the baseline and then is left rooted to the spot as Kwon whips a wonderful forehand winner beyond him.
Two break points to Kwon!
Wimbledon Uncovered's reporter Nick McCarvel is eagle eyed, as always - and good to see Kyle Edmund hitting with that Murray chap!
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*Djokovic 6-3 3-6 6-3 0-1 Kwon
Djokovic floats a backhand long, handing Kwon the advantage, before a lovely bit of serve and volleying wraps up the game for the South Korean.
Djokovic 6-3 3-6 6-3 Kwon*
That's a good serve from Kwon, and Djokovic can only net in response.
Deuce.
Djokovic 6-3 3-6 6-3 Kwon*
I think the Kwon challenge might be starting to fade a little.
The ball is coming a little cleaner off Djokovic's racquet and, from 30-0 down, he works his way to a break point after winning a lengthy rally.
Van Uytvanck v Raducanu
Emma Raducanu will be on Centre Court after these two.
Novak Djokovic's match might be a bit lengthier than she was expecting but it looks like the British number one has a good way to keep herself occupied.
Emma Raducanu trains ahead of centre court debut against Belgian Alison van Uytvanck