Defending champion Adrian Lewis and Simon Whitlock joined James Wade and Andy Hamilton in the last four of the World Championships after victories at Alexandra Palace last night.
Lewis enjoyed a 5-3 win over Terry 'The Bull' Jenkins to book a meeting with Wade, while Whitlock delivered a comprehensive 5-1 victory over Gary Anderson and will now meet Hamilton for a place in the final.
Wade and Hamilton had earlier beaten John Part and Kim Huybrechts in the afternoon session.
Lewis had taken a 3-0 lead, only for Jenkins to level, and there was little to choose between either man at that stage.
ADVANTAGE
At 2-1 to Lewis in the seventh set, Jenkins had the chance to level with a double 20, but he was unable to make his darts count and his opponent took advantage to go 4-3 up.
A double top put Lewis 2-1 up in the eighth, and he hit bullseye and double 20 for victory to book a potentially thrilling semi with Wade despite being unsettled by the crowd.
He said: "I got the job done.
"I was missing doubles -- tonight I missed a fair few.
"Wade had a hard match against John Part but the thing is Wadey's never won it and I have. That's the difference."
Whitlock had not been among the favourites coming into the competition given he had suffered a broken ankle in October, but he came back from a set down to dominate.
'The Wizard' threw eight maximums and, although Anderson was more impressive than the score suggests, he missed chances and Whitlock took advantage to book a spot with Hamilton in the last four.
Whitlock said: "I've got belief in myself at the moment and I'm not letting my ankle problem be a handicap to me.
"Andy Hamilton will be a tough opponent in the semi-finals. He is playing some fantastic darts at the moment and he seems to thrive under pressure."
Earlier, third seed Wade moved into the semi-finals following an epic 5-4 victory over Part.
Wade was in control early on, taking nine of the first 11 legs of the match.
However, he missed a chance to go 4-1 up and Part hit back to take the next three sets to lead 4-3 before Wade levelled to force a sudden death shoot-out which he won. It propelled the 28-year-old into his first semi-final since 2008.
CONTROL
He said: "I had a great start to the match and felt like I had established control, but before I knew it John was 4-3 ahead and I was struggling. But I did recover from that setback and I'm delighted to be in with a chance of becoming world champion."
Hamilton reached the semi-finals fwith a 5-2 win over Kim Huybrechts.
Appearing in the first of the last-eight clashes, the Stoke thrower was impressive with 11 180s and a three-dart average over 102.
Hamilton took a two-set lead before Huybrechts hit back to win the third set without reply. The number 17 seed then pulled 4-1 ahead and, although his opponent took the sixth, Hamilton claimed victory with three maximums in the seventh.