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Semi-finals are best of 33 frames – first to 17 wins
Mark Williams will face Zhao Xintong in the World Championship final
RESULT: Judd Trump 14-17 Mark Williams
Match to be concluded with nine possible remaining frames in evening session
China's Zhao Xintong awaits winner in final after beating Ronnie O'Sullivan 17-7 on Friday
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Emma Smith
Result: Trump 14-17 Williams
More from Mark Williams, speaking to BBC Two:
"I came here with not much form, I lost in the first round in the past few tournaments, but I wasn't really too concerned.
"I worked in the club from half past eight every morning for four or five hours, me and Lee [Walker, Williams' coach], and we've been putting the hours in just to try to get a bit of form, trying with contacts and without contacts.
"I really struggled with my eyes in the past couple of tournaments and I've tried everything – contacts, varifocals. I left it for Lee to decide because he knows if I'm playing alright and how I'm hitting them, and he said he thought I was better off going without them.
"Lens replacement was booked for 12 June – deposit paid – but I'm going to have to have a think. I want my deposit back!"
Result: Trump 14-17 Williams
Mark Williams, speaking to BBC Two after reaching the World Championship final:
"I was starting to twitch towards the end, I'm not going to lie. I nearly missed the black in the last frame – I did feel a bit of tension on the back arm.
"I'm never normally nervous at any stage but I was in that break.
"I can't believe I'm in another final – I don't know how I'm doing to be honest."
#bbcsnooker, via WhatsApp on 03301231826 or text 81111 (UK only, standard message rates apply)
The first all left-handed Crucible final ever?
Craig, Falkirk
It is indeed!
Judd Trump, Mark Williams and Neil Robertson are the previous left-handed world champions, and none of them played a fellow leftie in the final.
Result: Trump 14-17 Williams
Mark Williams reveals he is due to have his eye surgery on 12 June and has paid his deposit, but now isn't sure whether he might have wasted his money.
There looked to be nothing wrong with his vision, nor his snooker, tonight.
Trump 14-17 Williams
Mark Williams is in the BBC studio.
"I was starting to twitch before the end," admits the 2025 finallist.
Full Willo quotes to come.
Trump 14-17 Williams
Steve Sutcliffe
BBC Sport at the Crucible Theatre, Sheffield
Mark Williams' long pot success is 69%. Not bad for a player who says he struggles to see the balls.
Trump 14-17 Williams
A handshake between two left-handed greats, two of the finest players of their both own and this current generation.
But tonight belongs to the elder statesman.
Mark Williams, aged 50, becomes the oldest man to ever reach the World Snooker Championship final.
Trump 14-17 Williams
Trump 14-16 Williams
If Mark Williams sinks the black here, surely that's game over…
He does it!
And Williams celebrates with a fist pump.
Trump 14-16 Williams
Ken Doherty
1997 world champion on BBC Two
Mark Williams is so cool, he doesn't feel nerves like other players, he's very calm.
Trump 14-16 Williams
Mark Williams has not reached the Crucible final since he last won here in 2018.
He is on the verge of ending that seven-year wait now, this break looks potentially match-winning.
Oh! The black wipes its feet before dropping in to the bottom right. Heart in mouth moment.
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World Snooker Championship: How do players cope with the pressure of the Crucible?
BBC Radio 3 Unwind's Niall Breslin looks at how the intense pressure at the Crucible can affect a snooker player's mental health and the importance of mental skills for all sportspeople.
Available to UK users only.
Trump 14-16 Williams
A few oohs and aahs as Williams bumps the blue off the jaw of the right middle pocket – it drops in, almost in slow motion.
But Williams remains at the table, inexorably reeling off reds.
Trump 14-16 Williams
Now Judd Trump plays a stunningly cut red – and he's freed up the black!
But he can't find the right angle, and he leaves the black over the pocket.
Could that be a decisive moment?
Trump 14-16 Williams
Mark Williams breaks the deadlock with a well cut red into the bottom right, but gets an inopportune kiss off a loose ball.
He can't build a break, and this frame remains in the balance.
Trump 14-16 Williams
The black is surrounded by three reds, the pink is the wrong side of the baulk line and neither man has scored a point yet in frame 31.
You could cut the tension with a knife.
Trump 14-16 Williams
Interesting factoid – both men have the same largest break in this match so far: 116.
Another indicator of how little there is to separate them.
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Judd Trump vs Zhao Xintong would be an excellent final, with Williams and O’Sullivan passing on the torch to the next generation.
Fred
Trump 14-16 Williams
With the black out of service, this has turned into another very tactical frame. Both men are playing up and down the table, plenty of caution on display.
Judd Trump plays a terrific snooker with the white behind the brown, but Mark Williams worms out of it.
Trump 14-16 Williams
Steve Davis
Six-time world champion on BBC Two
It's "one frame at a time" stuff, don't get ahead of yourself, play the balls that are in front of you, hope your opponent doesn't push on and you never know what's going to happen.
You need to be optimistic as a snooker player.
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