Image source, Rex Features

Cameron Norrie closes out a hold to 15 with a cushioned forehand volley. That's the first routine service game we've had for a while.

Mark Woodforde
17-time Grand Slam doubles champion on BBC Radio 5 Sports Extra and BBC Sounds

When I see Zverev go to net when he is in control of the point, he tends to volley like he knows his way around the net.

It's when he gets brought to the net that I think he is very unsteady, not knowing how to position himself.

Lovely point from Alexander Zverev. Serve out wide to drag Cameron Norrie off the court, cross-court forehand to get the Brit on the run, drop shot, and forehand volley into an open court.

Hold secured.

The point trading continues. Cameron Norrie hammers a second-serve return on to the baseline and Alexander Zverev nets his reply. Advantage neutralised.

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Alexander Zverev approaches the net, recovers one passing shot but can do nothing about the second as Cameron Norrie sends him the wrong way with a cross-court backhand: 15-all.

The pair trade the next four points, Norrie getting on top of a lengthy baseline battle to produce a delicate forehand drop shot and force deuce.

I already have an ominous feeling that we could be in for the long haul with this one.

Image source, Getty Images

Alexander Zverev converts his fourth break point to get this opening set back on serve. A small smile from the German as Cameron Norrie misses a forehand.

Uh oh. Another break point as Cameron Norrie nets a backhand.

Cameron Norrie saves the first with a forehand winner, aggressively stepping into the court.

He saves the second with a big T serve which Alexander Zverev returns into the net.

And he saves the third, this time dragging the German out wide and then making him run to the opposite corner. His reply finds the net.

No drama.

Alexander Zverev has woken up.

He sticks around in two long rallies and is rewarded with errors from the opposite end of the court before unleashing a forehand winner to collect three break points of his own.

Mark Woodforde
17-time Grand Slam doubles champion on BBC Radio 5 Sports Extra and BBC Sounds

Not unless he is willing to make the changes to his game.

As Andy [Lapthorne] said, the tools are there and there is a sense that he can win a Slam but he just hasn't been able to put it together at the back end of a tournament.

He needs to play closer to the baseline and be willing to take on the risks. You cannot beat these guys [Carlos Alcaraz and Jannik Sinner] on the baseline.

Image source, Rex Features

Well, well, well... an early break for Cameron Norrie, producing an explosive forehand down the line. Three break points? He only needed one!

Sharp pick-up from Cameron Norrie, who unleashes a forehand winner.

Alexander Zverev then shanks a forehand of his own for 0-30 before Norrie, on the run after being stretched on his backhand side, lands a forehand just inside the baseline to earn three break points.

Hmm, Jamie Murray said before the match that Cameron Norrie should avoid Alexander Zverev's backhand but the Brit is doing the opposite.

He forces two errors on that wing either side of Zverev using a down-the-line backhand rocket to tee up a smashed winner.

Norrie closes out a comfortable hold to 15. The crowd is already behind the Brit, who described them as "unreal" following his second-round win.

Andy Lapthorne
Sixteen-time Grand Slam quad doubles champion on BBC Radio Sports Extra

At one point I thought he would, now with Sinner and Alcaraz I think it's highly unlikely.

He has definitely got the game to do it, but does he have the belief that he can beat those two players back to back? I don't know.

Alexander Zverev, dressed all in black, won the coin toss and elected to receive, so it's Cameron Norrie, a bright flash of orange across his shoulders, who will get this third-round tie under way on John Cain Arena.

Will it be seventh time lucky for Norrie against the German third seed? He's the last Brit standing in the singles.

Off we go!

*denotes next server

Image source, EPA

We've been short on shocks at this year's Australian Open - this arguably wouldn't be one either, but a slight surprise nonetheless.

Russia's Andrey Rublev, a three-time quarter-finalist in Melbourne, has just lost a tie-break to go two sets down to Argentine Francisco Cerundolo - who is bidding to reach the fourth round here for the first time.

We'll keep an eye on that one - and third-round matches between Frances Tiafoe and Alex de Minaur, and Elina Svitolina v Diana Shnaider, both of which have just started.

Jamie Murray
Seven-time Grand Slam doubles champion on BBC Radio 5 Sports Extra

Image source, Getty Images

I think what might get Cameron Norrie into trouble is that Alexander Zverev has one of the best backhands in the game. Being left-handed, a lot of Cameron's shots will be going into the backhand where Zverev is very comfortable - he is happy being deep in the court.

He has also got a bigger serve than Cameron and is more capable of getting cheaper points, and maybe 'roll through' service games more.

For Cam, his forehand down the line will be an important shot to get Zverev running into the corner - can he sneak in a bit, come to the net and use his short volleys, or drop shots to get Sascha running?

I think getting Zverev out of his comfort zone is going to be the challenge for Norrie.

Donna in Northumberland: Huge congratulations to Iva Jovic overcoming one of the best (and endearing) top-tier gatekeepers in Jasmine Paolini. Super coverage from Russell and Gigi and it's always lovely to hear Jamie [Murray]'s wisdom. Ready for Norrie now, let's go!

Jamie Murray
Seven-time Grand Slam doubles champion on BBC Radio 5 Sports Extra

Image source, Getty Images

It's going to be a battle for him and he hasn't got a good record against Zverev, but Cameron is starting to play good tennis again.

He had a great second half of the year last year and I think he's started to settle down, figure out what made him so good and so hard to beat and gone back to basics. He's more at ease and more relaxed about competing.

He needs to do some things different against Zverev, so let's see what he is capable of.

Image source, Getty Images

The last time these two met at the Australian Open, they played out an absorbing five-set fourth-round match.

Alexander Zverev edged a first-to-10-point tie-break to prevail 7-5 3-6 6-3 4-6 7-6 (10-3).

In their other previous meeting at a major, they played out a 32-point tiebreak at Wimbledon in 2024 which remains the joint-fourth longest in a men’s singles match at a Grand Slam.

Cameron Norrie has never beaten a top-five player at a Grand Slam, but he did end a five-match losing streak against top-five ranked players by beating world number one Carlos Alcaraz in Paris last year.