Match point Alcarazpublished at 16:28 British Summer Time 11 July
*Fritz 4-6 7-5 3-6 6-6 (6-7) Alcaraz
How has he done that? Seriously?
Watch and listen to live BBC coverage of day 12 at Wimbledon (UK only)
Jannik Sinner claims dominant straight-set win over Novak Djokovic to reach final against Carlos Alcaraz
Pair played an epic French Open final just five weeks ago, with Alcaraz winning
Two-time defending champion Alcaraz earlier beat Taylor Fritz to extend winning streak to 24 matches
Sinner and Alcaraz are world number one and two respectively
Alcaraz has won five majors and Sinner three
Phil Cartwright, Nicola Pearson and Sean Kearns
*Fritz 4-6 7-5 3-6 6-6 (6-7) Alcaraz
How has he done that? Seriously?
Fritz 4-6 7-5 3-6 6-6 (6-6) Alcaraz*
Andre Agassi
Former Wimbledon champion on BBC One
In a two-horse race, you never know what you're going to get.
When you get something special, it's a privilege.
*Fritz 4-6 7-5 3-6 6-6 (6-6) Alcaraz
Carlos Alcaraz saves a second set point and Taylor Fritz will be kicking himself.
A slow return gave the American the perfect opportunity to hit a forehand winner but he hit it conservatively, before hitting long.
Fritz 4-6 7-5 3-6 6-6 (6-5) Alcaraz*
Deary me.
Carlos Alcaraz saves one set point but Taylor Fritz still has another.
*Fritz 4-6 7-5 3-6 6-6 (5-4) Alcaraz
Tim Henman
Former British number one on BBC One
Changing direction over the high part of the net, beautifully struck and not even the speed of Alcaraz could hunt that one down.
*Fritz 4-6 7-5 3-6 6-6 (5-4) Alcaraz
Smashing stuff from Taylor Fritz, who wins both points on Carlos Alcaraz's serve.
If he can hold his two serves, we'll have a fifth set.
Fritz 4-6 7-5 3-6 6-6 (4-4) Alcaraz*
Three straight points for Taylor Fritz, this latest one on Carlos Alcaraz's serve.
A brilliant backhand down the line that the Spaniard can't return.
Fritz 4-6 7-5 3-6 6-6 (3-4) Alcaraz*
Big two points for Taylor Fritz.
De la Puente 0-6 0-1 Hewett*
Another game, another break for Alfie Hewett.
This is ruthless from the defending champion.
Third seed Martin de la Puente just does not know what to do here to get himself into this match.
It's not that the Spaniard is playing badly, but Hewett is just playing that well.
Starting to feel like when, not if, the Brit will be back in the men's wheelchair singles final here at SW19.
*Fritz 4-6 7-5 3-6 6-6 (1-4) Alcaraz
An astonishingly deft volley at the net gives Carlos Alcaraz a three-point lead.
Taylor Fritz needs two big serves.
Gary Rose
BBC Sport at Wimbledon
Carlos Alcaraz is working the crowd, raising his fist in the air and shaking it with the noise going up a level as a result. He's drawing on their support here.
Fritz 4-6 7-5 3-6 6-6 (1-2) Alcaraz*
Carlos Alcaraz wins one of the two points on Taylor Fritz's serve and then puts an arm up to the crowd like a gladiator.
*Fritz 4-6 7-5 3-6 6-6 (0-1) Alcaraz
Carlos Alcaraz takes the first point on his second serve.
Fritz 4-6 7-5 3-6 6-6 Alcaraz*
With Taylor Fritz 40-0 up, Carlos Alcaraz wins the next two points with two stunning clipped shots.
But the American hammers an ace when he needed it most to take the hold.
We'll need a tie-break to separate these two.
*De la Puente 0-6 Hewett
That was quick.
Alfie Hewett is toying with Martin de la Puente.
The defending champion needs little time to race to 40-0, covering the court well, but the Spaniard still has some fight in him as he claws it back to 40-30.
Not to worry for Hewett, though, getting up quick to De la Puente's drop shot and putting the ball into the open court to take the first set with a bagel.
*Fritz 4-6 7-5 3-6 5-6 Alcaraz
Deary me, this set has really gone up a notch in terms of quality during these last few games.
Carlos Alcaraz holds to 15, sealing the hold on his second serve with an ace.
What a player.
Fritz 4-6 7-5 3-6 5-5 Alcaraz*
Andre Agassi
Former Wimbledon champion on BBC One
What's so awesome about this game - we might be a minute and a half away from this match being over with, or we could be another hour and 15 minutes away. You have to get past the finish line.
If you're Alcaraz, you feel the energy pulling you across the line and then you feel the resistance.
If you're Fritz, you have the hope.
It makes this battle epic.
Fritz 4-6 7-5 3-6 5-5 Alcaraz*
That was excellent from Taylor Fritz.
His serving, as is to be expected, was strong but he showed some excellent groundstrokes there too.
De la Puente 0-5 Hewett*
Alfie Hewett really has some superb touch around the court.
The second seed and defending champion once again gets himself a comfortable hold with a lovely drop shot followed by an ace to seal it.
Third seed Martin de la Puente is feeling the pressure as Great Britain's Hewett gets to 15-30 on the Spaniard's serve.
An excellent backhand return down the line brings up yet another opportunity to break and the Brit takes it with his next return.
Hewett has a triple break and is racing towards this opening set.
*Fritz 4-6 7-5 3-6 4-5 Alcaraz
Andrew Castle
BBC Sport tennis commentator on BBC One
It's been a great and stubborn effort all the way through this tournament for Taylor Fritz, he arrives tired from having won Eastbourne and winning in Germany before that.
It's been a really tremendous contribution from Taylor Fritz here, he hasn't looked like being the winner in this match for the entire time it's been going on - but he's hanging about and trying.