A BIG break of throw for Luke Humphries, taking out 85 in two darts, and he leads once more.

Wayne Mardle
Former World Championship semi-finalist on Sky Sports

Image source, Reuters

Both men are averaging 109 - this is ludicrous.

Six 180s in six legs, five of them by Cross.

A 180 followed by a 177, then an 86 checkout on the bull, and Voltage levels.

Image source, Getty Images

A rare error from the world number one as Humphries misses a dart at double 16 and then one at double eight.

Cross mops up to hold throw and maybe keep himself in the match. Being 4-1 behind in a race to six would have been extremely tough to come back from.

Wayne Mardle
Former World Championship semi-finalist on Sky Sports

The 60 is taking one hell of a beating.

These two scoring brilliantly, both averaging above 106 towards the end of the fifth leg.

John Part
Former PDC world champion on Sky Sports

It will hurt more because it was simple execution. It was as if he didn't try!

Wayne Mardle
Former World Championship semi-finalist on Sky Sports

That will hurt, that will sting!

Oh, Luke Humphries, stop it.

Two treble 20s, double five, a 130 checkout and a 3-1 lead.

He's so good when he's on song.

John Part
Former PDC world champion on Sky Sports

The longest leg in this match has been 13 darts - not bad!

Rob Cross off the mark in the semi-final. This is shaping up to be a very, very good match.

Cross hits a 180 but Humphries responds in kind and finishes the leg in 11 darts to take a 2-0 lead.

Super start by the world champ.

Luke Humphries almost takes out a 170 finish in the opener, missing his effort at the bull, but he's far enough ahead to hit the winning double at his next visit.

Rob Cross won the throw for the bull off stage, so he will be throwing first in our opening semi-final, which will be played over the best of 11 legs.

Game on!

Image source, Reuters

MC John McDonald brings out the players, starting with Rob Cross - known as "Voltage" because he worked as an electrican before turning professional.

Then comes "Cool Hand" Luke Humphries, the world number one and reigning world champion.

Luke Humphries takes on Rob Cross in the first of tonight's semi-finals - the current and former world champions were probably the two most impressive performers in their quarter-finals earlier this evening in Brighton.

Humphries averaged more than 105 in his 6-2 win against Gerwyn Price, while Cross saw off the league leader Michael van Gerwen by the same scoreline.

• Luke Humphries v Rob Cross
• Luke Littler v Michael Smith

Image source, Reuters

• Luke Humphries 6-2 Gerwyn Price
• Rob Cross 6-2 Michael van Gerwen
• Nathan Aspinall 3-6 Luke Littler
• Michael Smith 6-5 Peter Wright

It's been far from a classic but Michael Smith gets over the line in the decider to set up a semi-final against Luke Littler.

Peter Wright, with 84 left, gets two darts at double 12 for his first win in this year's Premier League - but can't find the red bit!

Smith returns to hit double 10 and gets his first Premier League victory since night two.

Into a decider!

Michael Smith misses a match dart at the bull, and Peter Wright checks out 71 to send us all the way in this fourth and final quarter-final of the evening.

Wayne Mardle
Former World Championship semi-finalist on Sky Sports

Peter Wright lost the bullseye before the match so if it goes to 5-5 he'll throw second in the deciding leg, which could prove crucial in a match which hasn't seen a break of throw yet.