Jonathan Jurejko
BBC Sport at Melbourne Park

A few whistles from the Laver crowd as Tsitsipas changes his trainers. Nadal jogs on his toes behind the baseline.

The cynic in me might wonder if that is a tactic to stall Nadal's momentum. I'm sure it isn't...

At the moment, this match is heading the same way as the opening two clashes between the pair.

Another service game to love from Nadal. Another game won. Another one closer to the first set.

The backhand of Stefanos Tsitsipas is getting a workout today and Nadal then attacks down the line, Tsitsipas can only just get to it, and attempts a lob shot but there is too much juice on it and it goes long. (30-0)

A lovely backhand down the line from Stefanos Tsitsipas helps him hold his serve. Beautiful shot. No sign of panic from the Greek, but Nadal, remember, has the crucial break.

Tsitsipas lost his last service game, but bangs down his first ace of the match to move 30-0 ahead in the fifth game.

Image source, Getty Images

Marion Bartoli
Former Wimbledon champion on BBC Radio 5 live

It's very interesting to be in our position because you can see the different spin to the ball.

With Nadal it's about not to deliver a flat serve. As you can see, Nadal's serve has plenty of spin on it and it's difficult for Tsitsipas to return.

Jonathan Jurejko
BBC Sport at Melbourne Park

Although there are many Greek fans inside Laver, it is a fair split in terms of the support. It is Rafa after all.

Loud whoops when he clinched that break with another forehand down the line. That shot has been smoking for the Spaniard this fortnight.

Nadal showing why he did not lose his serve, not even once, in his past three matches. It is just too good. A backhand return misses from Tsitsipas and that is a love hold.

Image source, AFP

Sulaimon Adelekan: With Roger Federer out, Rafael Nadal is my favourite to win the Australian Open but I hope Tsitsipas doesn't upset Nadal.

At 30-40, an aggressive point from Rafael Nadal, storming into the net, and it works. Tsitsipas tries to go down the line, but the angle isn't there and Nadal, at the first opportunity, takes the break.

Image source, AFP

A beautiful forehand down the line from Nadal brings our first break point.

A half-chance for Tsitsipas at 15-30, but as quickly as as the opportunity comes, it then vanishes. An unforced error when Tsitsipas pulls a forehand too far wide and that is 1-1.

Jonathan Jurejko
BBC Sport at Melbourne Park

There ain't no party like a Tsitsipas party...

A fine early rally, with Tsitsipas on the defensive with a number of backhand returns, but the Spaniard then is just off target with a drop shot at the net.

A sweeping forehand is called out, Nadal disagrees but the original call was correct. Early hope for the underdog. (15-30)

Marion Bartoli
Former Wimbledon champion on BBC Radio 5 live

Tsitsipas looks calm and collected - he's moving between points which means he's keeping active.

He's also rushing Nadal already.

Tsitsipas gets the first couple of points on the board, then he goes on the attack, charging into the net and forcing Nadal to go long. The Spaniard can then only send a return into the top of the net and a nerve-settling early hold from the Greek.

If Tsitsipas wins he will become the youngest major finalist (aged 20 years 170 days), since Novak Djokovic (20 years, 112 days) at the 2007 US Open.