Live updates as third round concludes and fourth round starts at Alexandra Palace
RESULT: Defending champion Luke Humphries knocked out with 4-1 defeat by Peter Wright
Afternoon saw Callan Rydz, Kevin Doets and Jeffrey de Graaf reach round four - read more
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Clayton 1-2 Price (2-1)
Gerwyn Price roars in celebration. He's back in this set with a break of throw.
It was much better from the former world champion but Jonny Clayton still has a dart for the set, missing tops for a 113 out.
Price goes on to hit double 12 and can force a deciding leg if he holds in the next.
Clayton 1-2 Price (2-0)
Signs of life from Gerwyn Price with a couple of two-treble visits but all it takes is one slack one and he's up against it again.
Jonny Clayton is in no mood to let him off the hook and hits tops for a 13-dart break of throw.
The Ferret will throw first with a chance to level the match at two sets apiece.
Clayton 1-2 Price (1-0)
Laura Turner
Ex-Women's World Championship quarter-finalist on Sky Sports
Things are getting worse for Gerwyn Price.
Clayton 1-2 Price (1-0)
It's all Jonny Clayton now and he holds with ease to start the fourth set.
A 16-dart hold under very little pressure from Gerwyn Price, who looks a different player to the one who bossed sets one and two.
Clayton 1-2 Price (3-0)
And just like that Jonny Clayton has a set back.
Brilliant against from the seventh seed.
Gerwyn Price was waiting on 75 but never gets a look at it as Clayton goes treble 20, treble 19, double 12 for a brilliant 141 checkout.
Clayton 0-2 Price (2-0)
Laura Turner
Ex-Women's World Championship quarter-finalist on Sky Sports
The high-scoring that we saw from Gerwyn Price in the first two sets has deserted him a little bit in this set so far.
Clayton 0-2 Price (2-0)
Image source, PA MediaThis is more like it from Jonny Clayton!
He was blown away by Gerwyn Price in the first two sets but now The Ferret is fighting back.
A superb 121 out, clinched with a bullseye. Superb.
Clayton 0-2 Price (1-0)
Jonny Clayton breaks to start the third set. The comeback start here?
It looks as though Gerwyn Price has the leg wrapped up but he misses two darts at tops and another at double 10 to let his fellow countryman in.
Clayton only has one dart at tops but that's all he needs to gain the advantage in this set.
Image source, Getty ImagesHere's a question a few of you have asked, so we consulted the official rules.
The standard height from the floor to the bullseye on the dartboard is 5 feet 8 inches (1.72m), while the oche (distance between the front of the board and the toeline) should measure 7ft 9.25 ins.
Clayton 0-2 Price (1-3)
Image source, Getty ImagesGerwyn Price has a two-set lead.
A fantastic start to the match from the Ice Man. He nails another double 20 to seal the set.
He's averaging 107 so far and hitting 54.5% of his doubles. Good luck trying to live with that...
Clayton 0-1 Price (1-2)
Dan Dawson
Commentator on Sky Sports
This is a long tournament and players can put themselves into form. When you've got the ceiling and have won the trophies that Gerwyn Price has then you can win the tournament.
People haven't been talking about him but they will if he makes the quarter-finals.
Clayton 0-1 Price (1-2)
Gerywn Price is feeling it now!
The 2021 champion breaks with a dazzling 124 checkout.
Treble 20, 14, bullseye. He'll now have the darts as he tries to wrap up the set.
Clayton 0-1 Price (1-1)
Strong leg from Gerwyn Price.
A maximum to kick off the leg gives him the advantage and he doesn't look back, hitting double 20 for a 13-darter.
Clayton 0-1 Price (1-0)
Lovely finishing from Jonny Clayton.
He hits double 13 to take out 81 and hold to start this second set.
Clayton 0-1 Price
Very strong start from Gerwyn Price. He averaged 103.37 in that first set.
He's 1-0 up and, just to remind you, this is the same format as the third round so it's best of seven sets again.
Price is three away from a place in the quarters...
Image source, Getty ImagesDarts is one of the few sports that can measure perfection; snooker has the 147 maximum break, golf has the hole-in-one, darts has the nine-dart finish.
The fewest number of darts required to finish a standard leg of 501 points is nine.
There are several ways to complete a nine-dart finish, the most common being two visits of 180 followed by a 141 checkout.
The most recent nine-darter at the PDC World Championship was earlier on Friday by Australia's Damon Heta against Luke Woodhouse. He went on to lose, though.
It was the second of this year's tournament after Christian Kist's (pictured above) on 17 December.
There is a method of completing a nine-darter with three identical visits of 167 - treble 20, treble 19, bull - although that is usually saved for the exhibition circuit rather than in tournament play!
Clayton 0-1 Price (1-3)
Gerwyn Price hits tops and takes the first set - he enjoyed that one!
It is Jonny Clayton's turns to rue a missed opportunity, he has two darts at double eight for the leg but neither find their mark.
Price comes back and gets tops at the second attempt to strike first.
Clayton 0-0 Price (1-2)
From a position of dominance, Gerwyn Price manages to lose the leg.
He misses a couple of darts at tops and while he struggles to finish it off, Jonny Clayton closes in and finds double 16 to extend the set.
Clayton 0-0 Price (0-2)
Dan Dawson
Commentator on Sky Sports
Gerwyn Price has started beautifully.
Clayton 0-0 Price (0-2)
Not this time for Gerwyn Price!
He goes down for the treble 19 and misses but he'll settle for a 10-darter.
Double 12 gives him the break of throw and he's a leg away from taking the set.