Littler holds by taking out 128published at 19:38 GMT 1 January
Littler 1-0 Ratajski (1-0)
Luke Littler is down to a finish first with 128 remaining. He goes for it with 18, treble 20 and bull.
Silly stuff, this.
Evening results: Luke Littler 5-0 Krzysztof Ratajski, Luke Humphries 1-5 Gian van Veen
Defending champion Littler receives positive response from crowd in straight-set win
Van Veen averages more than 105 to knock out 2024 world champion Humphries
Afternoon results: Ryan Searle 5-2 Jonny Clayton, Gary Anderson 5-2 Justin Hood
England's Searle into his first World Championship semi-final and will play Littler next
Scotland's two-time champion Anderson into last four for first time since 2022
Semi-finals to be played on Friday, with final scheduled for Saturday
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Charlotte Coates and Adam Millington
Littler 1-0 Ratajski (1-0)
Luke Littler is down to a finish first with 128 remaining. He goes for it with 18, treble 20 and bull.
Silly stuff, this.
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This can only end with Luke vs Luke surely?
Stewart, Gatwick
If Littler's on form it should be a walkthrough... can't see an upset here.
Gavin, Milton Keynes
Littler 1-0 Ratajski (0-0)
Right, Lukey boy. You've reeled in the Big Fish already. Fancy a nine-darter?
Image source, PA MediaLittler 1-0 Ratajski
Stuart Pyke
Commentator on Sky Sports
What a shot!
That is incredible.
But should we be surprised?
Littler 1-0 Ratajski (3-2)
What a way to win the set!
Luke Littler leaves the Big Fish and reels it in. BANG.
Littler 0-0 Ratajski (2-2)
Luke Littler gets a dart at tops for the set but can't hit it. Krzysztof Ratajski can't make the most of his chance but he comes back after Littler misses three for the double.
Ratajski steps up and whacks a dart in double nine.
Littler 0-0 Ratajski (2-1)
Stuart Pyke
Commentator on Sky Sports
Luke Littler doing Luke Littler things.
What a leg to win after hitting treble one with your first dart.
Littler 0-0 Ratajski (2-1)
Krzysztof Ratajski is down to 161 with Luke Littler not on a finish but the Pole can only get down to 101. He gets a dart at double 12 but wires it.
Back comes Littler and he nails the double 10 for the break.
Littler 0-0 Ratajski (1-1)
Luke Littler is showing off here. He hits a 160 with treble 20 and two at bullseye. He comes back for 40 - hits 20 and double 10.
Image source, Getty ImagesLittler 0-0 Ratajski (0-1)
John Part
Former PDC world champion on Sky Sports
That'll be pleasing for Krzysztof Ratajski. It's an important leg, just to say 'I'm here, it's possible for me to win legs.'
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I think Littler and Humphries will be pushed tonight maybe a deciding set in each.
Richard, Halkirk
Littler 0-0 Ratajski (0-1)
Krzysztof Ratajski bangs in the first 180 of the match to leave 88 with Luke Littler back on 200.
Ratajski misses double four but he comes back and finds it with the first dart.
Littler 0-0 Ratajski (0-0)
"There's only one Luke Littler" is booming around the Ally Pally as Krzysztof Ratajski gets us going in this quarter-final.
Littler v Ratajski
Luke Littler has dropped two sets in his run to a third quarter-final in a row. Here's how he got here.
Image source, Getty ImagesLittler v Ratajski
Don't think anyone will be too shocked to hear a few boos aimed at Luke Littler as he makes his walk to the stage.
Plenty still singing away to his walk-on song, though.
Littler v Ratajski
Wayne Mardle
Former World Matchplay finalist on Sky Sports
We know Luke Littler has got the game to do anything.
Krzysztof Ratajski is up against it and he knows that, but he's a danger.
Image source, PA MediaLittler v Ratajski
Here we go then.
Poland's Krzysztof Ratajski is making his way to the stage on the famous Ally Pally stage.
Littler v Ratajski
Luke Littler wasn't too happy with some booing from the crowd during his win over Rob Cross and here's what he had to say immediately after the match...
"I'm not bothered [by the booing]. Really not bothered. You guys pay for tickets and you pay for my prize so thanks for booing me," Littler told Sky Sports.
"No-one wanted me to win but I proved them wrong yet again."
In a later press conference, he said he "lost" his head reacting to the hostility and that he can learn how to deal with crowds better.
Wonder what his reception will be tonight...
Image source, Getty ImagesLittler v Ratajski
Luke Littler's defence of his title has gone to plan so far. He hadn't dropped a set until coming across former world champion Rob Cross in the fourth round.
The 18-year-old came through in a 4-2 win but let's take a look at what happened in his post-match interview...
Image source, Getty ImagesLittler v Ratajski
Will we see this again on Saturday night?
Luke Littler's pursuit to go back-to-back continues tonight as he looks to book his spot in the semi-finals.
But standing in his way is Poland's Krzysztof Ratajski.
Image source, Getty Images