Image source, Reuters

Ace out wide. Roar.

T serve. Jannik Sinner only just gets a racquet on it. Roar.

Novak Djokovic escapes again.

Ace. The crowd roars.

A forehand error from Novak Djokovic present Jannik Sinner with a break point. Djokovic encourages the crowd to get behind him.

More angry words from Novak Djokovic, this time directed at himself as he hits loose forehands either side of a winner.

He pulls the game back to 30-all after coming out of top of a lengthy baseline exchange, the back and forth of both players accompanied by the telltale squeaks of the hard court.

At 40-30, Jannik Sinner telegraphs a drop shot, has it chased down, but has a good enough position in the court to convert the forehand winner.

Annabel Croft
Former British number one on BBC Radio 5 Sports Extra

It's incredible the way Djokovic is bellowing at his box. He has just turned around and absolutely screamed at them.

He really is so intense on court and it is so hard to fathom what is going on in his head.

Image source, EPA

Jannik Sinner shows his first real emotion of the match, offering up a small smile and a pump of the racquet as a serve is returned long for 40-15.

He follows it up with a forehand smash winner.

"Keep this level" is the shout from his box.

Annabel Croft
Former British number one on BBC Radio 5 Sports Extra

Djokovic had to do something to change the tempo of the match because Sinner was getting too comfortable with the pace and he was absorbing everything.

He was just enjoying the rhythm of the match, but now everything has changed.

Image source, Getty Images

From 0-40 down, Novak Djokovic wins five consecutive points to consolidate the break.

He completes the hold with a one-two punch - wide serve followed by a forehand winner into the opposite corner.

Jannik Sinner needs to reset. Quickly.

Novak Djokovic completes a sharp forehand pick-up to drag Jannik Sinner into the net and although the Italian gets there, he can't convert the forehand. One break point saved.

A wide serve is returned into the net. Two break points saved.

Another wide serve, this time to Sinner's backhand, is returned into the net. THREE BREAK POINTS SAVED.

And it gets worse. Novak Djokovic makes a real hash of a backhand and finds himself facing three break points.

Uh oh. Jannik Sinner's forehand winner is followed by a double fault from Novak Djokovic. 0-30.

Image source, Getty Images

Jannik Sinner's forehand goes long and Novak Djokovic has his break. He throws his arms up in the air to orchestrate the cheers.

Sinner has only dropped one set at the Australian Open this year, remember.

Break point three of the game and four of the match for Novak Djokovic, who is hitting the fluff off every return and finding joy as he overpowers Jannik Sinner in a baseline exchange.

No, not this time. Jannik Sinner's first serve is thriving in the pressure moments.

Rod Laver Arena roars with Novak Djokovic. Can he convert his third break point of the match?

Opportunity missed. Jannik Sinner's first serve rocks up on a big point and draws the forehand error.

Deuce.

Jannik Sinner's first serve is having a little holiday and it's giving Novak Djokovic a nice foothold in points, allowing him to get inside the baseline and set up a volley winner with yet another drop shot.

Trailing 15-30, Sinner finds a timely ace to level the game but then produces a poor drop shot allows Djokovic to pounce.

Image source, Getty Images

A quick hold to love for Novak Djokovic, drawing a run of forehand return errors from Jannik Sinner.

After his iffy start, the Serb has now gone four consecutive service games without offering up a break point.

Russell Fuller
BBC tennis correspondent on BBC Radio 5 Sports Extra

Perhaps the most sobering moment for Djokovic [against Sinner] was two years ago at the Australian Open.

He was on a 33-match winning streak at the Australian Open and he lost the first two sets 6-1 6-2. He won the third set, but he was completely outplayed.

That felt like quite a significant moment.

Image source, Getty Images

Novak Djokovic profits from a backhand error from Jannik Sinner to take a 0-15 lead. He's grumbling to himself after the point. No idea why...

Later in the game, there's a full-throated roar as he misses a forehand.

At the other end of the court, Sinner is expressionless as he holds to 15.