Evening results: Charlie Manby 1-4 Gian van Veen, Michael van Gerwen 1-4 Gary Anderson, Luke Humphries 4-1 Kevin Doets
Anderson knocks out third seed and three-time champion Van Gerwen
Afternoon results: Luke Woodhouse 2-4 Krzysztof Ratajski, Jonny Clayton 4-2 Andreas Harrysson, Justin Hood 4-0 Josh Rock
Debutant Hood hits first 11 attempts at doubles in superb display against 11th seed Rock
Woodhouse misses double 12 for nine-dart finish in third set against Ratajski, who will play Luke Littler next
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The fourth round will be completed today, with another rest day tomorrow followed by the four quarter-finals across two sessions on Thursday.
After that, both semi-finals will be played on Friday in an evening session, with the final taking place on Saturday.
Clayton 1-0 Harrysson (3-2)
Image source, Getty ImagesFifth seed Jonny Clayton needs 86 for the set. He goes 18, 18 but misses the bull. Can Andreas Harrysson nick it? Not this time, he can't find a treble.
Clayton can, though, and he takes the opening set.
Clayton 0-0 Harrysson (2-2)
Jonny Clayton can't get a go at the double from 121 and leaves 64 with Andreas Harrysson working his way down to 72.
He doesn't get to come back, though, with Clayton hitting double 16 to force a decider.
Clayton 0-0 Harrysson (1-2)
Andreas Harrysson has a go at 122 with Jonny Clayton not on a finish but can only leave 76.
Harrysson hits the treble but misses both goes at double. Back he comes and pins double four.
Clayton 0-0 Harrysson (1-1)
Jonny Clayton lands another 180 to set up the 141 and he takes it out!
He goes treble 19, treble 20 and double 12.
Unreal.
Clayton 0-0 Harrysson (0-1)
Image source, Getty ImagesJonny Clayton bangs in the first 180 of the match in the opening leg. He needs 90 but misses the bull.
Andreas Harrysson lands the double 16 for an early settler.
Clayton v Harrysson
Jonny Clayton should win this, right? Well, it's not been going to plan for the seeds in this tournament and Andreas Harrysson will be looking to land on a quarter-final spot on his debut.
Fourth seed Stephen Bunting's early exit from the World Championship means there is potentially an automatic qualification spot in next year's Premier League up for grabs.
The top four in the world rankings at the end of the tournament are guaranteed places and, with a £1m first prize on offer at Alexandra Palace, it means whoever wins the World Championship will be in the world's top four.
Jonny Clayton, Gian van Veen and Josh Rock are provisionally ranked fifth, sixth and seventh at the moment, but extending their runs in the event may well be enough to put them above Bunting in the standings.
Read more about how qualification for the Premier League works.
Clayton v Harrysson
Image source, Getty ImagesJonny Clayton, speaking to Sky Sports before his fourth-round match against Andreas Harrysson:
"I'm definitely motivated. I'm looking forward to it. I've not played against Andreas before and I'm sure it's going to be a belter.
"As a seed, it's good to see the others fall. We're here to win a big prize and without them in it, it's better for us. I'll take it game by game and hopefully it's going to be my year."
Clayton v Harrysson
Andreas Harrysson walks out to Avicii - The Nights.
Banger.
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This will be the first 4-0 of the day here. Jonny Clayton will find his top form. Hope I'm wrong, but I have a feeling Andreas will get peppered today.
Cal, Runcorn
Result: Woodhouse 2-4 Ratajski
Krzysztof Ratajski's win not only puts him into a World Championship quarter-final, but it also lifts him back into the top 32 of the PDC world rankings.
He's provisionally up to number 28 as it stands.
The rise in prize money at this year's World Championship really can make a difference to a player's ranking if they have a good run.
Woodhouse 2-4 Ratajski
Krzysztof Ratajski will take on defending champion and world number one Luke Littler in the quarter-finals on New Year's Day.
Get that in your diary.
Woodhouse 2-4 Ratajski
Image source, Getty ImagesLuke Woodhouse makes a mess of the 100 left so back comes Krzysztof Ratajski with darts to win it.
He misses his first at double 16 but lands the second to secure his spot in the quarter-finals.
Woodhouse 2-3 Ratajski (1-2)
Luke Woodhouse flings in a 180 but keep him in the leg. He needs 164 but only gets down to 100.
Krzysztof Ratajski steps up needing 141, but again, can't touch it.
Woodhouse 2-3 Ratajski (1-2)
Krzysztof Ratajski hits 137 to leave 40. Luke Woodhouse can't touch the 150 he has left so back comes Ratajski to hit tops.
He's now one leg away from the quarter-finals.
Woodhouse 2-3 Ratajski (1-1)
Good stuff from Luke Woodhouse to find the 140 to leave 60. Krzysztof Ratajski can't take out 164 so Woodhouse comes back and hits the double 10.
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Really enjoyed the darts this year with so many surprises and shock results. Good to see plenty of new talent making a name for themselves.
Ian, Peterborough
Woodhouse 2-3 Ratajski (0-1)
Krzysztof Ratajski has been great on the double 16 today and he finds it once again to take the lead in the set and move two legs away from the quarter-finals.
Woodhouse 2-3 Ratajski (0-0)
Krzysztof Ratajski is averaging 97 at the moment and is hitting the doubles in all the right moments.
A place in the last eight may well be waiting for him.