Raymond van Barneveld's 50th birthday party didn't work out as planned.
Barney lost 7-2 to Dutch rival Michael van Gerwen, which is a big blow to those hopes of getting to the O2 for Finals Night next month.
It wasn't a great night for Team Unicorn with Gary Anderson and James Wade also suffering disappointing defeats.
Van Barneveld was strangely subdued and with the exception of a superb 140 finish to win the second leg, he struggled to apply any real pressure and Van Gerwen cashed in.
He broke Barney for a 3-2 lead and put his foot on the gas. Van Gerwen also took out a crucial 92 check-out (20, D18, D18) and the World Champion won five legs on the spin to book his place in the semi-finals.
It turned into a nightmare night for Anderson, when it looked like being the perfect night in Northern Ireland.
And his 7-4 defeat to Phil Taylor is a setback to his hopes of making the play-offs. The Unicorn man would have put himself in prime position for the semi-finals, but now faces a real scrap to get through.
Anderson raced into a 4-0 lead and looked unstoppable but he seemed to lose focus and Taylor hit back. Gary wired a dart at the bull for a 129 finish to go 5-3 in front and didn't really get a look in after that as his opponent ended up winning seven straight legs.
Anderson's remaining matches are against Van Barneveld, Wade and Van Gerwen. It may well be that the last play-off spot is a fight between Anderson and Barney. Apart from next week's huge all Unicorn clash in Birmingham, the Dutchman then plays Chisnall and Wright.
Wade's semi-final ambitions were extinguished as he went down 7-3 to Peter Wright. It was a below par performance from both men, but Wade just couldn't get going with the big scores to challenge his opponent.
The first five legs went with throw before Wright secured a crucial break thanks to a 76 finish and he repeated the dose to move 5-2 in front after the Unicorn had just missed the bull for a 161 check-out.
There was no coming back and Wright cantered past the winning post to boost his hopes of qualifying for the Premier League play-offs for the first time.
It was a good night for Dave Chisnall who gave himself an outside chance of qualification with victories over both Adrian Lewis and Taylor.
Dave Chisnall 7-3 Adrian Lewis
Phil Taylor 7-4 Gary Anderson
Peter Wright 7-3 James Wade
Michael van Gerwen 7-2 Raymond van Barneveld
Dave Chisnall 7-2 Phil Taylor
1 - Michael van Gerwen 19pts
2 - Peter Wright 17pts
3 - Phil Taylor 15pts
4 - Gary Anderson 14pts
5 - Raymond van Barneveld 14pts
6 - Adrian Lewis 13pts
7 - Dave Chisnall 12pts
8 - James Wade 10pts
By STUART PYKE
Photo courtesy Michael Cooper / PDC