Tsitsipas is really putting it on Nadal now, he's managed to stem the Spaniard and soak up a little of his sting. Nadal teases a backhand long but makes no mistake with a smash at the net. 15-15.

Tsitsipas sprints to 40-0 with a combination of string-shattering serves and then fires a neat forehand winner beyond a rooted Nadal to hold.

All in the eyes, as Rafael Nadal gives his opponent the look and reverses a forehand in the other direction with a grunt from mid-court. He scuttles into the net for a love hold.

Leaping, angled ace from Rafael Nadal. The next pounds off Stefanos Tsitsipas' strings and drops long. 30-0.

And Stefanos Tsitsipas holds. He's looking hungry. We have a quarter-final on...

Andrew Castle
BBC Sport tennis commentator on BBC Radio 5 Live Sports Extra

If there's a Rafa playbook it has this on page one: Serve in out wide, dispatch short ball.

It's the basics and Rafa does it so well. He hasn't lost a point with that pattern since he was about five.

Rocket of an ace from Stefanos Tsitsipas and more fire off the strings of the Greek takes it to 30-0.

Andrew Castle
BBC Sport tennis commentator on BBC Radio 5 Live Sports Extra

Nadal will be a little bit perplexed and disappointed and now has something to deal with because those misses on the overhead in the tie-break will have been a blow.

Rafa looks tired. He has incredible fitness but he hasn't played a match before this tournament, and so this comes down to heart.

Rafael Nadal just cranks through the gears to stave off the break and hold serve with a ferocious forehand winner.

Nadal fends it off with an overhead smash at the net. Deuce.

Brilliant from Stefano Tsitsipas, finding his line and length and wrong-footing Rafael Nadal to earn an early break point.

Nadal punches his way back to 30-15 but then wraps a forehand into the tape and it leaps wide.

30-30.

Andrew Castle
BBC Sport tennis commentator on BBC Radio 5 Live Sports Extra

Tsitsipas winning the set had seemed extremely unlikely and he will be greatly relieved to give this account of himself. He might be in the zone now.

He's got to win three in a row but it won't seem impossible to him now. His calmness to keep his composure has been impressive.

Image source, Reuters

Does the fightback start now?!

Rafael Nadal, two sets to one up, serves first in the fourth but it's Stefanos Tsitsipas who is on the board for 0-15.

Rafael Nadal drifts a backhand long from the baseline after some punchy groundstrokes from Stefanos Tsitsipas, and the Greek takes the third set!

Nadal saves the first with a deft drop volley.

Two set points to go for Tsitsipas.

This is the chance for the Greek...

Stefanos Tsitsipas edges to 5-3 with a big serve that gets stuck underneath the on-court clock.

He comes flying to the net off the next and puts away a forehand volley.

Three set points.

Oooh, looked good from Tsitsipas on the backhand return but it wriggles into the tramlines.

Nadal, drenched in sweat on the Rod Laver Arena, watches a high ball drop on the baseline, takes it on the bounce and thunders it long!

Great exchange as both players go skidding across the tarmac to retrieve before Rafael Nadal flops a forehand into the tape. Stefanos Tsitsipas thunders down a serve to edge ahead.

Oh, wow!

Rafael Nadal thrashes a relatively straightforward smash well off target. Don't often see that...