Gerwyn Price starts with a 174 and goes on to break with a 13-darter.
A couple of misses at double before coming back to hit double five after Rob Cross was unable get the big 154 checkout.
Cross v Price
Rob Cross is bidding to make his first Premier League final of the year.
Until recently, he very consistently won his quarter-finals but has continually fallen at this stage.
Will he change that tonight?
Frank Keogh
BBC Sport at M&S Bank Arena, Liverpool
Image source, PA MediaThe darts brings out all manner of outfits – but are there rules about what you can wear? Well, yes…
The PDC says it encourages spectators to “engage themselves in the fun nature of the event and therefore fancy dress in permitted, although no imitation weapons, inflatables or political or religious dress will be allowed.”
I think nuns are allowed, however, although football club team shirts are not. National team colours of the host country are fine.
As for the players, they are required to wear smart tros and footwear with their player’s shirt – no trainers or jeans.
Cross v Price
Image source, PA MediaTime for semi-final number two.
If Rob Cross and Gerwyn Price hit the same levels are they did in their respective quarters, then we're in for a treat...
Result: Humphries 6-4 Van Gerwen
It was incredibly close on the averages with Luke Humphries bettering Michael van Gerwen by 0.01 - 98.22 to 98.21.
MVG had five 180s to Humphries' two. But he floundered on the doubles.
The Dutchman hit just four of 18 on the outer ring - 22.2% - compared to Cool Hand's six of 15, 40%.
Humphries 6-4 Van Gerwen
Image source, PA MediaLuke Humphries gets it done!
There will be no comeback for Michael van Gerwen this time.
The Dutchman did have a chance of another break but one poor visit is all it took to see that vanish.
Humphries takes out 62 for the match and will have a shot at a third nightly win.
Humphries 5-4 Van Gerwen
Wayne Mardle
Former World Championship semi-finalist on Sky Sports
Luke Humphries has slowed down. He's throwing slower. He's being too deliberate and trying not to throw poor darts.
Humphries 5-4 Van Gerwen
Luke Humphries sees his first match dart miss the mark - he misses bullseye.
That gives Michael van Gerwen a sniff and that's all he needs.
Double top and the Dutchman is back to within one. He needs another break now.
Humphries 5-3 Van Gerwen
Wayne Mardle
Former World Championship semi-finalist on Sky Sports
Luke Humphries makes it look so simple. He's an elegant thrower.
Humphries 5-3 Van Gerwen
Has Michael van Gerwen got another comeback in him?
Well, he has one break back.
Double eight gives him a 14-darter as Luke Humphries lags behind.
Humphries 5-2 Van Gerwen
Wayne Mardle
Former World Championship semi-finalist on Sky Sports
Michael van Gerwen has to be happy with the way he's throwing though, he has to be. His form is rolling into a second event.
There are massive signs of improvement for him.
Humphries 5-2 Van Gerwen
Missed chances for both players and it's Luke Humphries who, eventually, hits for another break.
Cool Hand missed two for the leg before Michael van Gerwen did the same.
Two more go astray for Cool Hand before he gets double five to close in on the final.
Humphries 4-2 Van Gerwen
Rod Studd
Commentator on Sky Sports
Michael van Gerwen is making the kind of errors you can't afford to against the world number one Luke Humphries.
Humphries 4-2 Van Gerwen
Both players are heating up now but Luke Humphries has a two-leg advantage.
Two 180s for Michael van Gerwen aren't enough with Humphries responding to the second with a 177 before hitting double eight to hold.
Humphries 3-2 Van Gerwen
No sooner is he pegged back, Luke Humphries regains the advantage.
The world number one missed double 16 on the first occasion but he is back to get it at the second attempt when MVG fails to take out 79.
Humphries 2-2 Van Gerwen
Image source, PA MediaMichael van Gerwen is right back in this with a superb 12-darter.
He was on for a nine-darter with a pair of 180s, couldn't get that but then goes double-double on tops to take out 100.
Game on!
Humphries 2-1 Van Gerwen
Michael van Gerwen holds but only after making extremely hard work of it.
Three darts at tops go begging, giving Luke Humphries a chance at the 85 out.
But this time he can't get it and MVG comes back and hits double 10 to get on the board.
Humphries 2-0 Van Gerwen
Luke Humphries is on a roll tonight.
He holds with a brilliant 120 checkout. Made to look so simple.
Humphries 1-0 Van Gerwen
Wayne Mardle
Former World Championship semi-finalist on Sky Sports
Image source, PA MediaLuke Humphries has not put a dart wrong tonight really.
Humphries 1-0 Van Gerwen
Luke Humphries is gifted the opening leg - and a break of throw.
Michael van Gerwen has a chance of a 13-darter but misses tops and then two at double 10.
A ruthless Humphries takes out 74 to make him pay.