Joe Cullen made it through to the World Matchplay semi-finals for the first time after a dominant 16-11 victory over Daryl Gurney, while Nathan Aspinall overcame housemate Chris Dobey by the same scoreline.
Cullen hit eight 180s and a 142 checkout with a 97.11 average to keep Gurney at arms length as 'The Rockstar' broke new ground to reach the last four, while Aspinall stumbled over the finishing line against Dobey, closing out a 16-12 victory with a 99.3 average and 10 180s.
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Cullen, the former Masters champion and Premier League runner-up, produced an inspired display of finishing to dump out tournament favourite Gerwyn Price in a dramatic tie-break last time out and he started where he left off by surging into a 5-0 lead against two-time semi-finalist Gurney.
The Northern Irishman finished off 77 to clinch his first leg of the match after the first interval before producing a 132 checkout on the bull to trail 8-5.
Cullen responded in style with a 142 checkout before Gurney nailed tops to remain in outside contention at 9-6.
Gurney, who is the most decorated player left in the top-half of the draw, having lifted televised titles at the World Grand Prix and Players Championship Finals in 2017 and 2018 respectively, made it three legs from four to close the gap to 10-8.
'The Rockstar' restored his four-leg lead at 12-8 and the Yorkshireman remained cool, calm and composed to sink back-to-back legs 13 darters for a 14-10 advantage in the race to 16.
The 34-year-old landed double 4 to move on the brink of victory and he marched into his first World Matchplay semi-final by sinking tops.
Aspinall continued his challenge against his stablemate Dobey, who dumped out world No 1 Michael Smith in Tuesday's last 16.
There were three consecutive breaks of throw heading into the first interval, but it was 'Hollywood' Dobey who held the early initiative 3-2.
Aspinall, featuring in his third consecutive World Matchplay quarter-final, averaged 117.5 in the session with a scoring average of 134 but still ended up a leg behind.
Dobie came out after the break and struck with a spectacular 140 before nailing sensational tops, tops to stretch his advantage to 6-3, but back came Aspinall from 7-5 down with three legs on the spin to regain the lead for the first time since the opening leg.
The former UK Open champion soon opened up a two-leg cushion with a superb 92 finish, culminating with successive double 18s and he made it seven out of eight legs for a 12-8 lead on double eight after wiring the bull for a 167 checkout.
Reigning Masters champion Dobey was being put to the sword but he threatened one of the great comebacks with an 84 finish for an 11-darter to trail 15-12.
Aspinall eventually staggered over the finishing line after pinning double 8 in front of Stockport legend Ricky 'The Hitman' Hatton before embracing Dobey.
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Ryan Searle and Jonny Clayton kick off Friday's last eight action, before Damon Heta and tournament favourite Luke Humphries battle it out for a place in Saturday's semi-finals.
We're back for more World Matchplay action at the iconic Winter Gardens on Friday at 8pm as the world's top stars battle it out for the Phil Taylor Trophy - live on Sky Sports Action.