Postpublished at 16:43 British Summer Time 11 June 2021
Russell Fuller
BBC tennis correspondent at Roland Garros
I just think understandably Tsitsipas has never been in a Grand Slam final - he's just a little tight.
Passive is the word.
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Stefanos Tsitsipas beats Alexander Zverev to reach first Grand Slam final
Alex Bysouth and Harry Poole
Russell Fuller
BBC tennis correspondent at Roland Garros
I just think understandably Tsitsipas has never been in a Grand Slam final - he's just a little tight.
Passive is the word.
Zverev 3-6 3-6 6-4 5-3 Tsitsipas*
Wow, Tsitsipas does well just to meet a whopping serve as Zverev eases into another service game.
Another monster strike down the centre confirms yet another hold to love. Tsitsipas isn't getting a look-in at present.
Naomi Cavaday
BBC Sport tennis commentator
Most of the people were talking about Tsitsipas when the draw came out.
Looks like the certainty is just evaporating from the Tsitsipas' game.
Zverev* 3-6 3-6 6-4 4-3 Tsitsipas
Tsitsipas continues to chip away despite Zverev's growing confidence.
A couple of great serves put Zverev on the back foot, and the Greek finishes of his points nicely to remain in contention in the fourth. This is a great battle.
Zverev 3-6 3-6 6-4 4-2 Tsitsipas*
Tsitsipas rallies, whipping a backhand into the corner that Zverev hits into the netting.
A huge forehand then takes the German within two games of levelling the match.
Zverev* 3-6 3-6 6-4 3-2 Tsitsipas
Really well worked point by Zverev. Tsitsipas is forced wide and the German exploits the empty court with a controlled forehand.
Finally, Zverev concedes a point on serve, completely mis-hitting a forehand from the baseline. 30-15.
Jonathan Jurejko
BBC Sport tennis writer
Unlike Tsitsipas, Zverev has already won a Grand Slam semi-final - and that time, at last year's US Open, he came back from two sets down.
To reach his first major final, the German climbed tennis' biggest mountain to beat Spain's Pablo Carreno Busta in New York.
Now he is threatening to do the same again after raising his level considerably over the past 50 minutes or so.
Wonder whether those memories from Flushing Meadows are towards the front of Zverev's mind right now?
Zverev* 3-6 3-6 6-4 3-2 Tsitsipas
Tsitsipas just about catches the line to close in on another hold, but Zverev is able to get one point before pulling a forehand long.
Nobody's hanging about on serve at the minute.
Zverev 3-6 3-6 6-4 3-1 Tsitsipas*
Zverev hasn't lost a point on serve for some time. Certainly not in his past three games now, as he holds to love again.
Zverev* 3-6 3-6 6-4 2-1 Tsitsipas
Super stuff from Zverev, pinning Tsitsipas back with some powerful hits, which inevitably sees Tsitsipas roll into the net after some good defence.
He's a completely different player now to the one we saw in the opening set. There's much more of a spring in his step and he darts in from the baseline to get to 40-0.
Zverev* 3-6 3-6 6-4 2-1 Tsitsipas
Well done Tsitsipas. He takes his own hold to love with his best game for a while, shifting Zverev across the baseline before striking with a cross-court forehand to wrap things up swiftly.
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Zverev 3-6 3-6 6-4 2-0 Tsitsipas*
For the first time in this match Tsitsipas looks like he's feeling the pressure.
The Greek is talking to himself and towards his team as the momentum begins to turn against him, the umpire stepping down to overturn his apparent winner.
That takes Zverev to 40-0, and another Tsitsipas error gives him a hold to love.
Zverev* 3-6 3-6 6-4 1-0 Tsitsipas
Tsitsipas into the net, and that's the early break for Zverev!
Zverev 3-6 3-6 6-4 0-0 Tsitsipas*
Zverev is flying at the moment. He arrows a backhand down the line to reach 30-30.
Tsitsipas responds, celebrating taking the next point with a big cheer, but he's pegged back to deuce.
With the angle against him, Zverev sets up break point...
Zverev 3-6 3-6 6-4 0-0 Tsitsipas*
Tsitsipas goes long and an improving Zverev takes the third set!
It's game on in Paris.
Zverev* 3-6 3-6 5-4 Tsitsipas
Zverev makes the perfect start with a seventh ace.
He's fortunate on the next point, though, catching a smash at the net with his frame but there's enough on it to do the job. He's two points away.
Zverev* 3-6 3-6 5-4 Tsitsipas
Zverev to serve for the set, then, and take us to a fourth.
Zverev* 3-6 3-6 5-4 Tsitsipas
Zverev channels that anger and delivers a delightful lob to draw level, but Tsitsipas edges ahead and an ace does the trick.
Zverev 3-6 3-6 5-3 Tsitsipas*
Can Tsitsipas hold on to create one more opportunity on the Zverev serve?
The umpire is out of his chair after a line judge calls a Tsitsipas shot out, and overturns the call.
Zverev isn't happy at all with this, he's lost the point but is adamant he would have returned the ball. 30-15 to the Greek.