Day eight of the Australian Open
Novak Djokovic beats Jiri Lehecka 6-3 6-4 7-6 (7-4) in fourth round
Jack Draper retires injured while trailing Carlos Alcaraz 5-7 1-6
Defending champion Aryna Sabalenka beats Mirra Andreeva 6-1 6-2
Coco Gauff joins her in quarter-finals after 5-7 6-2 6-1 win over Belinda Bencic
Britain's Henry Patten and Olivia Nicholls beat Italian top seeds to reach mixed doubles quarter-finals
Use audio icon to listen to live commentary from Melbourne on BBC Radio 5 Sports Extra (UK only)
Draper 5-7 1-6 Alcaraz
So, who has the daunting task of facing Carlos Alcaraz in the quarter-finals?
We'll find out soon. Novak Djokovic and Jiri Lehecka are up next on Rod Laver Arena to fight it out.
Image source, Getty ImagesDraper 5-7 1-6 Alcaraz
Annabel Croft
Former British number one on BBC Radio 5 Live and BBC Sounds
It’s such a shame because Draper has been so unlucky. We could see how much damage he can do and how uncomfortable he makes his opponents feel.
Jonathan Jurejko
BBC Sport in Melbourne
You felt this might be the moment for Draper to call it a day, but we weren't sure when he walked back to his chair.
After taking a moment to consider his options, Draper decides enough is enough.
He holds both hands up to the crowd as a way of an apology before going off to a warm ovation.
Draper 5-7 1-6 Alcaraz
He is. Jack Draper calls for the trainer but after a quick chat, he shakes his head and the sweatbands come off.
The British number one trudges over to Carlos Alcaraz, who gives him a warm embrace.
Not the ending anyone wanted.
*Draper 5-7 1-6 0-0 Alcaraz
And all of a sudden, the second set is finished.
And Jack Draper could be too.
Draper 5-7 1-5 Alcaraz*
Gigi Salmon
BBC Sport tennis commentator on BBC Radio 5 Live and BBC Sounds
Draper is pulling up off shots. He’s digging into that hip area trying to ease or move something.
This really happened quite quickly.
*Draper 5-7 1-5 Alcaraz
Carlos Alcaraz gets it but he doesn't celebrate, instead holding a hand up to his opponent to try and make sure Jack Draper is OK.
A grimace on the face of the British number one tells you he is not.
Image source, Getty Images*Draper 5-7 1-4 Alcaraz
Annabel Croft
Former British number one on BBC Radio 5 Live and BBC Sounds
Draper is either hurting or the legs feeling very heavy – he doesn’t want to expend any more energy at the moment.
*Draper 5-7 1-4 Alcaraz
This looks like it's getting tougher by the minute for Jack Draper physically.
He's doing his best to reach each strike from Carlos Alcaraz, but it looking like it's doing more damage than good.
The Spaniard has got himself two break points.
*Draper 5-7 1-4 Alcaraz
The unforced errors keep coming from Carlos Alcaraz. That's 28 now.
Luckily for him, the winners are flying off his racquet too. Back-to-back forehand winners take him over the line.
Draper 5-7 1-3 Alcaraz*
Jack Draper claws his way back and gets the hold over and done with.
He's finally on the board in this second set. He needed that.
Image source, Getty Images*Draper 5-7 0-3 Alcaraz
Annabel Croft
Former British number one on BBC Radio 5 Live and BBC Sounds
It is mesmerising watching his movement.
Alcaraz gets to balls that seemingly are imposable and what he does with the racquet face when he tracks it down like that.
*Draper 5-7 0-3 Alcaraz
Finally, the net cord works in Jack Draper's favour and it's advantage to the British number one as Carlos Alcaraz misses.
But my, oh my. Alcaraz pulls us back to deuce with an unbelievable get, sliding into the drop shot from Draper before dinking it back over.
*Draper 5-7 0-3 Alcaraz
We go to deuce as Carlos Alcaraz finds the fence, but he's got another break point after beating Jack Draper with a booming backhand winner.
*Draper 5-7 0-3 Alcaraz
Jack Draper can only stand and watch as Carlos Alcaraz fizzes another winner well out of reach.
The British number manages to slam down an ace, but he nets the next point and it's another break point for Alcaraz.
*Draper 5-7 0-3 Alcaraz
Annabel Croft
Former British number one on BBC Radio 5 Live and BBC Sounds
This is where it gets quite tricky for Draper psychologically. All of a sudden, this match is going in a different direction quite rapidly, It’s been quite tight, until now.
He's fighting when the points are in play but in between the points he's looking weary.
*Draper 5-7 0-3 Alcaraz
It's all going downhill very quickly for Jack Draper as Carlos Alcaraz whizzes through his service game.
That's five games in a row for the Spaniard.
Draper 5-7 0-2 Alcaraz*
Annabel Croft
Former British number one on BBC Radio 5 Live and BBC Sounds
Alcaraz is having to adapt to a different height, different spin from Draper constantly.
That was crowd-pleasing stuff.
Draper 5-7 0-2 Alcaraz*
There it is. Total control from Carlos Alcaraz as he sends Jack Draper one way, then the other, and the 15th seed just can't keep up.
*Draper 5-7 0-1 Alcaraz
Jack Draper manages his way to deuce as Carlos Alcaraz goes long, but the Spaniard catches Draper flat footed on the next point with a cross-court forehand and earns himself another break point.