Hello and welcome to our LIVE coverage of Novak Djokovic against Daniil Medvedev.

That's Djokovic's tenth Australian Open quarter-final.

DJOKOVIC 6-4 6-7 6-2 6-3 MEDVEDEV: Djokovic can, though, and does - to 30, to wrap up what's been a gruelling encounter for both men.

Medvedev is angry. Mostly with his racket, which won't break.

DJOKOVIC 6-4 6-7 6-2 5-3 MEDVEDEV: Medvedev does still have a walloping forehand in his locker, and he moves to 30-0 before Djokovic takes three straight point to resume the lead.

DJOKOVIC 6-4 6-7 6-2 4-3 MEDVEDEV: But Medvedev is throwing everything at Djokovic here - time is running out and he might as well give it all he's got.

DJOKOVIC 6-4 6-7 6-2 4-2 MEDVEDEV: Remember Djokovic is a six-time champion here, although not since 2016. Lots of first serves off-target here, and he has to save break points again.

DJOKOVIC 6-4 6-7 6-2 3-2 MEDVEDEV: It's been Djokovic with the quicker service holds in this match, but Medvedev races through that. But then the Serbian knows that all he has to do now is hold serve three more times and he's in the quarter-finals.

DJOKOVIC 6-4 6-7 6-2 3-1 MEDVEDEV: Djokovic backs it up with a hold. Now, we already know that Medvedev can come back from a deficit...but this may be too much for him now.

DJOKOVIC 6-4 6-7 6-2 2-1 MEDVEDEV: When it comes to the rallies, both men look tired. But then it's past midnight now so that's not surprising. Djokovic has the psychological edge, though, and compounds that with an early break of serve in this fourth set.

DJOKOVIC 6-4 6-7 6-2 1-1 MEDVEDEV: That's a really hard-fought hold of serve. Medvedev is straining every sinew and he's helped by the fact that Djokovic is not playing flawlessly.

DJOKOVIC 6-4 6-7 6-2 0-1 MEDVEDEV: Djokovic's game plan has been to ride it out and grind Medvedev down, but the Russian comes out at the start of the fourth with gritted teeth. Hold to love.

Those break points saved seem to have completely turned this match around. Medvedev has no answers and Djokovic is comfortable..

DJOKOVIC 6-4 6-7 6-2 MEDVEDEV: That's the set.

DJOKOVIC 6-4 6-7 5-2 MEDVEDEV: Djokovic steps in, and brings out an inside-out forehand winner. Yeah, that's going to help you break serve of a very tired man. The world number one is trampling all over Medvedev now.

DJOKOVIC 6-4 6-7 4-2 MEDVEDEV: A swift hold to love for the top seed. There doesn't seem to be very much left in Medvedev's legs.

DJOKOVIC 6-4 6-7 3-2 MEDVEDEV: Djokovic with the momentum! He took a spill earlier in the set but that hasn't shaken him, and that fightback from three break points down helps him here.

That's a really significant hold, one feels, saving three break points to stay level in the third.

DJOKOVIC 6-4 6-7 2-2 MEDVEDEV: Battling tennis from Djokovic, coming back from what seemed a certain break to levelling at deuce.

DJOKOVIC 6-4 6-7 1-2 MEDVEDEV: Djokovic does still look like he is putting pressure on Medvedev's serve, pushing him to deuce, and though he is making mistakes still he doesn't seem too upset by them.