Josh Rock finds a 140 to leave 83 with Krzysztof Ratajski on 90.

Rock needs bullseye for the match but his dart drifts too high.

Josh Rock needs 144 to win in style but he can only go down to 82.

Krzysztof Ratajski comes back and finds double 19 to extend this match for another leg.

Josh Rock makes no mistake this time and finds the double eight to move one leg away from the last four.

It's not been the most thrilling of matches. We've only seen two maximums and neither of them have come from Josh Rock. Rock still averaging more than 100, though.

Rock goes for the 170 finish and leaves 72 with Krzysztof Ratajski on 56.

What happened there then? Rock misses the big number but Ratajski can't capitalise.

Krzysztof Ratajski's level has dropped considerably but he leaves 106 with Josh Rock on 40.

Can he take it out? Oooh, he wires the double 16.

Now time for Rock to take advantage and he does just that.

Image source, Kieran Cleeves/PDC

Josh Rock has lost focus with a poor set-up to leave 136 and then he only gets down to 70 from there.

No bother, though, he hammers in that double eight to take the lead.

Big ask for Krzysztof Ratajski now.

Josh Rock isn't firing on all cylinders at all but his finishing has been top stuff.

He's got a checkout percentage of 67% and that has dragged him back into this one.

Josh Rock is well in the driving seat now with only 36 remaining.

Can he level up? Oh yes, he can. The double 18 is nailed at the first time of asking and we're on level terms once again.

Wayne Mardle
Former World Matchplay finalist on ITV4

That could have been the point where this game got away from Josh Rock.

Ratajski landing the wrong side of the wire on double 16 is the bit of luck he needed, and he made it count.

Krzysztof Ratajski whacks in a 180 to pile the pressure on the Josh Rock throw. He leaves 24 but Ratajski only needs 47 for a break and he misses!

Rock finds the double 12 with one dart and he gives his fist a clench. That could've been game over there and then.

Right then, the players are back from the break and we go again.

Image source, Kieran Cleeves/PDC

Josh Rock is throwing better but he's hardly troubling the Krzysztof Ratajski throw and that's his big problem right now.

Ratajski only has to hold throw four more times and he's in the semi-finals.

Krzysztof Ratajski flies out of the blocks with a 177 to take control from the off.

Rock keeps chipping away and leaves 121 with Ratajski on 50, but he's not missing that and moves two legs to the good again.

Krzysztof Ratajski isn't throwing as well as he was before the break. Is his level starting to drop? Josh Rock will be hoping so!

Rock finds a 140 to leave 70. He finds the treble 18 and double 8 in two.

Yeah, this is better from Josh Rock as he chucks in a 134 to get his average up to 99.

Rock needs 93 but he misses two at double 18 and back comes Krzysztof Ratajski to punish the Northern Irishman and move two legs in front.

Wayne Mardle
Former World Matchplay finalist on ITV4

When Rock is getting chances, they are being popped.

He's picked up the pace, the tide may be turning here.

Image source, Kieran Cleeves/PDC

Josh Rock is trying to throw harder and faster to try to get himself going but it's hard work.

He leaves 130 and nails it by hitting T20, T20 and D5.

Turning point?

Josh Rock needs to check out 124 but he can't touch it. He's struggling with this pace.

Krzysztof Ratajski comes back and nails double 10.

Josh Rock looks deflated after hitting 59 with Krzysztof Ratajski on a finish. He scores 89 to leave tops with Rock miles away.

Ratajski has three darts at tops and all three were a good distance away.

Wayne Mardle
Former World Matchplay finalist on ITV4

Josh hasn't played poorly, he's just being outplayed - right now.

Maybe there's some regressing to come from Ratajski and, if there is, that's where Rock has to make hay.