Luke Humphries' defence of the BoyleSports World Grand Prix title continued with a battling 3-1 win over Jonny Clayton on Friday, as Ryan Joyce and Belgian duo Dimitri Van den Bergh and Mike De Decker joined him in the semi-finals.
A dramatic night of quarter-final action at Leicester's Mattioli Arena saw the event's final four players confirmed - with Humphries joined by two first-time World Grand Prix semi-finalists.
Reigning champion Humphries saw off 2021 winner Clayton in four sets, but overcame some nervy moments after the Welshman took a two-leg lead in the third.
A huge 149 checkout from Humphries saved the set, and he took he next two legs to move into a crucial 2-1 lead in the tie.
Clayton hit back from two legs down in set four, but was unable to pressure the world number one in the deciding leg as Humphries pinned double four to close out the win.
"That's probably the most nervous I've felt in a long, long time," admitted Humphries. "It's really not like me, but maybe I'm trying too hard.
"It was a really tough game. Jonny was unlucky there - he probably could have had the third set but that 146 changed everything.
"I feel really good and my game's in a good place so I won't take any negatives; I've won and that's it. I'll go into tomorrow in a confident mood - I know I can do it when it matters most."
Humphries now plays Ryan Joyce in the semi-finals on Saturday, after the Newcastle ace followed up a straight sets win over Gary Anderson by knocking out two-time winner James Wade in the same manner on Friday.
"Ryan will be looking forward to tomorrow, embracing and thinking that he's got nothing to lose," added Humphries.
"I feel very lucky that I'm still here but sometimes you've got to ride your luck. I prefer the longer format, so I'll be much more relaxed tomorrow.
"If I can perform like I can, it's going to be a tough game for Ryan but I know he's one of the best double 16 hitters in the world."
Joyce showed that accuracy on double 16 during a superb superb 3-2 win over number four seed Rob Cross, as the Newcastle ace reached just his second TV semi-final.
Cross made a superb start with a 14-darter and wrapped up the opening set with an 11-dart leg, only to see Joyce edge set two in a deciding leg and then land a 135 finish on his way to taking the third by a 3-1 margin.
Joyce took out a superb bull-bull-double 16 combination on 132 to open the fourth set, and tops loved him a leg away from victory before Cross took out 81 and 110 to tie the contest.
Cross also led in the decisive fifth set, but Joyce levelled and then punished misses from his opponent in the next two legs to capitalise and move into the last four.
Joyce finished 12 doubles from 19 attempts in a clinical display on the outer ring, and admitted: "It was a crazy match to play in - it's a great feeling to win.
"The match was topsy-turvy and every time I felt like I got ahead, Rob would throw a great leg. He's a class player.
"I always felt like this is the competition for me. I've played darts for so many years and I don't feel under pressure."
Humphries had defeated Joyce in his previous televised semi-final, at the 2023 Players Championship Finals, and he added: "Luke is not just a good player, he's maybe a generational player - but over this format I feel I can equal him and I'm going to try my best."
The other semi-final will be the first all-Belgian last four clash in a PDC Premier event after UK Open champion Van den Bergh and emerging star De Decker continued their best-ever World Grand Prix runs.
De Decker won through to his first televised semi-final in style with a superb 3-0 win over two-time champion James Wade in Friday's opening tie.
All three sets went to a deciding leg in a high-quality contest, but it was the emerging Belgian who prevailed to continue his dream Leicester run.
Wade finished 106 and 105 for a pair of 12-darters as he led in set one, but De Decker followed up two 14-dart legs by taking out 66 in the set's decider to edge in front.
The Belgian also won the second set's deciding leg with a brilliant 122 checkout for a 12-darter of his own, and held throw to move to the brink of victory at 2-1 in set three.
Wade pinned tops for a 13-darter to keep his hopes alive, but De Decker was again first to a finish in the deciding leg, and double four sealed his progression to the last four.
"I'm buzzing - really, really happy," said De Decker, who hit 42% of his starting doubles and 50% of his darts at a finishing double.
"I've been doing it on the floor tournaments for the last two years and I'm bringing it to stage tournaments now.
"I maybe look relaxed but I'm really nervous. It's going well and at the right moments I'm doing the right things. Everything is going well."
The tournament is being broadcast live on Sky Sports in the UK, through the PDC's worldwide broadcast partners including DAZN and Viaplay, and on PDCTV (excluding subscribers based in the UK, Germany, Austria & Switzerland).
Click here for information on where to watch the 2024 BoyleSports World Grand Prix.
2024 BoyleSports World Grand Prix
Friday October 11 (1900 BST)
Quarter-Finals
Mike De Decker 3-0 James Wade (3-2, 3-2, 3-2)
Ryan Joyce 3-2 Rob Cross (1-3, 3-2, 3-1, 2-3, 3-1)
Luke Humphries 3-1 Jonny Clayton (3-1, 1-3, 3-2, 3-2)
Dimitri Van den Bergh 3-1 Joe Cullen (2-3, 3-1, 3-1, 3-1)
Saturday October 12 (2030 BST)
Semi-Finals
Mike De Decker v Dimitri Van den Bergh
Luke Humphries v Ryan Joyce
Sunday October 13 (2000 BST)
Final
Humphries/Joyce v De Decker/Van den Bergh
Format
Quarter-Finals - Best of five Sets
Semi-Finals - Best of nine Sets
Final - Best of 11 Sets
All Sets are the best of five Legs, with all Legs needing to both begin and end with a double.
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