Another maximum from Gian van Veen! He can't finish it off then, missing two darts at double 12 and failing to take it out with his next three.

Jonny Clayton then sees off double 10 to level the match.

Wayne Mardle
Former World Matchplay finalist on Sky Sports

I think Gian is feeling as good as he's felt for about a month here.

And it's not about the numbers, we can see what he's doing. The first dart is going exactly where he wants it.

A 180 to kick off this leg from Gian van Veen, although his scoring slows a tad after that.

He is first down to a finish, albeit 160, while Jonny Clayton reaches 121.

41 on 160 doesn't help Van Veen and Clayton punishes him by taking out 121 with 20, treble 17 and the bullseye.

Gian van Veen is playing well, here. He gets down to 41. Clayton is down to 68.

Van Veen goes inside on double 16, but pins double eight to snatch the leg.

Jonny Clayton comes close to breaking here but can't find double 16.

Gian van Veen can't see off 74, though, and Clayton takes out double eight on his next visit.

Image source, PA Media

Gian van Veen is once again the first player to reach a finish - and, oh my, he does it with yet another 167 set-up shot.

It is double 16 for a second time in this match, but he misses three at it.

He finishes it on the next throw, checking out on double eight.

Wayne Mardle
Former World Matchplay finalist on Sky Sports

Gian doesn't lose semi-finals, does he? Will he win another one and get through to his fifth final?

The World Championship runner-up has already appeared in four finals in this year's Premier League but is yet to win a night.

I know the feeling, Gian. He begins with a 26. Jonny Clayton fires in a 108.

Van Veen responds with a 180 of his own, though.

He ends up being the first player down to a finish, impressively setting up double 16 with treble 20, treble 19 and the bullseye. He takes out the double in two darts.

Here we go!

Aled Williams
BBC Wales Sport at M&S Bank Arena, Liverpool

Jonny Clayton has already gatecrashed one party this evening by ending the hopes of local favourite Stephen Bunting.

His semi-final opponent Gian van Veen celebrates his 24th birthday today.

A win here would be a perfect present for the Dutchman - Clayton has form of upsetting the odds.

Laura Turner
Ex-Women's World Championship quarter-finalist on Sky Sports

Image source, PA Media

Despite those missed doubles in those early legs, Humphries didn't look frustrated and he wasn't letting it get to him. But as the game progressed and the more misses that came along, the frustration built up.

You have to feel for him but he's still not picking up points and that's what it's all about here.

That was a lot [of missed doubles] over a lot of legs. It has normally been at the business end of matches where he's had a few darts to win and hasn't been able to convert it. That was different, that felt like it could be quite damaging going forward.

It's how you bring yourself out. Next week he's going to be feeling the same, thinking he needs points, because he wants to defend his title.

As it stands, Jonny Clayton is five points clear at the top of the table.

Gian van Veen is now up to fifth, four points off Michael van Gerwen in fourth.

Semi-finals

• Gian van Veen v Jonny Clayton
• Michael van Gerwen v Luke Littler

Final

• Van Veen/Clayton v Van Gerwen/Littler

A big dent in Luke Humphries' top-four hopes.

Will the defending champion miss out on this year's play-offs?

Image source, Getty Images

Luke Littler gets down to double eight remaining. Luke Humphries is back on 161 and only scores 59.

Littler misses two at double eight and then goes inside with his third.

Humphries manages to set up a dart at tops, but goes over with that. Littler wraps it up on double four.

Luke Humphries pulls one more back and will have to win four more legs on the spin to turn this around.

He is averaging more than Luke Littler but has been poor on the outer ring.

Dan Dawson
Commentator on Sky Sports

Luke Humphries had a dart for a 10-darter there. The scoring has been superb, the finishing is one out of nine. He's had darts to win every leg bar one.

A fourth maximum from Luke Humphries, a first for Luke Littler.

Luke Humphries misses darts to win the leg. He could have had a 10-darter. Luke Littler doesn't make the same mistake as he takes out 60 with 20 and tops.