Alexander Zverev is first to blink in a baseline exchange, a loose forehand looping long for 15-15, but he responds with a 128mph serve out wide.

He goes even better, a 135mph ace takes him to game point. Nobody is stopping that, not even two Jannik Sinners.

Sinner shows his class with a forehand winner following a Zverev second serve, but yet another ace takes the German to safety.

This one? Oh, just 139mph.

Pat Cash
Former Wimbledon champion on BBC Radio 5 Live

Zverev's goal was to become a better player, and he knew he had to make some changes.

I'm not sure he changed that much in the French Open but managed to get over the line. But now he has the freedom to relax and try something new.

Image source, Getty Images

Jannik Sinner is on course for a rapid hold before his rhythm is disrupted by a shout from the crowd.

No bother, though. Alexander Zverev nets on the following point as we edge another game closer to a second tie-break.

Feels inevitable, doesn't it?

So far, there appears no sign of either player significantly dropping their level on serve.

Are we destined for tie-break after tie-break, or can someone conjure up a bit of magic to overcome the other?

Jannik Sinner drives in an angled backhand to take control of game eight in set two at 30-0.

Jonathan Jurejko
BBC Sport tennis news reporter at Wimbledon

Point! More 'ooohs' and 'aaahs' on Centre Court than there would be at Alton Towers.

This has been good fun - and a really high quality.

The crowd, who have paid more than a pretty penny for the privilege, are understandably lapping it up.

Marion Bartoli
Former Wimbledon champion on BBC Radio 5 Live

Image source, Getty Images

The body languages were completely opposite after that point.

Sinner lifting his arms and wondering 'how have I not won that?' and Zverev fist pumping to the crowd.

Image source, PA Media

It's Alexander Zverev waving his racquet after coming out on top in the latest enthralling exchange between these two, eventually breaking down Jannik Sinner's defence at the net on his way to another hold.

Andre Agassi
Former Wimbledon champion on BBC One

I had dinner with Zverev not too long ago. His diabetes is not something he talks about much but it is something he deals with daily.

Todd Woodbridge
Former Wimbledon doubles champion on BBC One

If Zverev is to win this tournament then he needs to keep going after that forehand.

When Sinner is coming over to his right, he likes to slide to that forehand but it is coming too fast.

The ball striking is phenomenal when you’re sitting this close.

Oooft! That could have been painful, but Jannik Sinner reacts superbly at the net to deflect a volley over to hold again.

Jannik Sinner rolls in a first serve with laser-like precision to edge ahead on serve, but Alexander Zverev gets fortunate with a net cord that leaves Sinner with no hope of salvaging for 30-30.

A huge fifth point here in the context of this match - and Zverev brings his hands to his face as he nets a second serve return. That was a chance.

Many will have had Jannik Sinner as their big favourite for this final, given the way he dismantled seven-time Wimbledon champion Novak Djokovic in the semi-finals.

But Alexander Zverev is not here to make up the numbers. The French Open champion has the taste for major titles now and is maintaining a remarkable level here.

Sinner produces his first double fault of the day to bring Zverev to 15-15.

David Law
Commentator on BBC Radio 5 Live

Sinner is walking towards his box and shaking his head. I don't think he can quite believe the level of Zverev right now.

It is like he is in a practice session with a couple of cans in each corner of the service box and he is just knocking them over.

Image source, PA Media

Alexander Zverev is powering through another service game before knocking a forehand wide for 40-15.

Another excellent return from Sinner and all of a sudden he is back within a point - but Zverev holds firm and blasts in a final winner to edge back in front with 90 minutes on the clock.

Andre Agassi
Former Wimbledon champion on BBC One

Sinner is showing some frustration. He is not getting into as many points as he would want to on Zverev’s serve.

It's the first forehand with Sinner that concerns me. It just looks like he is playing a little too conservatively. He is going to have to amp it up.

Jannik Sinner reaches 10 aces for the match, before Alexander Zverev nets a forehand to concede the game to love.

Nice and straightforward for the world number one as he looks to level this match, with still no break points conceded by the Italian.

The players are shaded by umbrellas at the change of ends, as spectators cool themselves by wafting paper fans.

It's not as hot as it was earlier this week, but it's still warm enough for Jannik Sinner and Alexander Zverev as they try and operate at their very best levels over a potentially multi-hour battle.

Sinner gets up and running with a superb passing shot, before hammering a forehand down the line for 30-0.

Ask Me Anything

Many of you have been in touch to ask why Alexander Zverev has been seen using his phone multiple times during matches at this year's Wimbledon - despite a ban on players doing so.

The reason is because Zverev is type 1 diabetic and therefore has a medical exemption from the rule in order to check his glucose levels.

The All England Club has told BBC Sport that Grand Slam tournaments have a list of players that are diabetic and those players are permitted to use their phones during matches in order to monitor their glucose and inject insulin if needed.

Zverev told BBC Sport he has two phones, one of which contains no SIM card as it is solely used for monitoring his glucose while on court.

It means he can simply read the levels that his glucose monitor is relaying to his phone screen, instead of doing constant finger-prick checks.

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The serving masterclass continues as Alexander Zverev takes control of his latest game.

The second seed forces Jannik Sinner back behind the baseline before closing in for a volley on his way to a clean love hold.