James Wade caused a sensation at the partypoker.com World Grand Prix by knocking out reigning champion Phil Taylor at Dublin's Citywest Hotel on Friday night, as Michael van Gerwen progressed to the semi-finals in a deciding leg alongside Gary Anderson and Stephen Bunting.

Wade, the 2007 and 2010 World Grand Prix champion, was at his clinical best as he ended Taylor's bid to claim a 12th title in the double-start format, with the Stoke ace paying the price for an off-day on his finishing.

Although Taylor took out 128 on the bull to lead 2-1 in the first set, he would miss three doubles to win the set in each of the next two legs as Wade levelled with a 108 finish and then hit double ten to move ahead.

The second set followed a similar pattern as Taylor led 2-1, with Wade taking out 142 in leg four and then punishing one miss at tops from the reigning champion to level the game by again posting a third-dart double ten to double his advantage.

Taylor turned the tables in set three, with Wade taking a 2-1 lead only to see his opponent level on double four before finishing a superb 12-darter on double 16 to take the deciding leg and halve his deficit.

However, Taylor's finishing doubles again went astray in the fourth set's opener as Wade finished tops to move a leg up, and the left-hander then took out 104 and 101 to complete his first win over the 16-time World Champion in a televised ranking event.

"I'm really happy," said Wade, who had hit a stunning nine-dart finish in his second round win over Robert Thornton. "I felt really good coming into the game and I was confident that I was going to play well.

"It's quite weird because I thought I was going to win 3-0 before I even picked a dart up today, and I never feel like that against Phil - that's not being disrespectful, it's just how I felt.

"It's quite weird because I thought I was going to win 3-0 before I even picked a dart up today"

"I was a little bit too nervous and I didn't quite hit the shots that I perhaps I should have done. I threw away the third set but I told myself to dig in and fortunately I got the fourth set.

"It wasn't a true reflection of how Phil can play, but I'll take it. Phil's the best player in the world and over the years I've probably shown him a little too much respect, but after that game I can start again against Phil.

"I've played some great matches against him and lost, so it's a fresh slate now and it's a big mind-block unblocked. That's my hardest game out of the way, and the rest I can play on ability now, not mentally.

I'm enjoying the game and in patches I'm probably better than ever. Anything could happen now."

Wade will now meet Gary Anderson in Saturday's semi-finals, after the Scot booked his place in a first World Grand Prix semi-final with a resilient 3-2 win over Kevin Painter.

Painter had come from two sets down to defeat Adrian Lewis in the second round but fell just short of repeating the feat against Anderson as the former Premier League champion continued his bid to take the title.

Anderson took the opening set without Painter having a dart at a finishing double, before defying a 108 finish from the Englishman to win the decider with a 68 checkout to move two sets up.

Painter, though, took the third set 3-1 and then took out 152 - with Anderson waiting on 36 for the match - to edge a dramatic fourth set in a deciding leg to send the game all the way.

Anderson, though, finished 72 and 116 to move 2-0 up in set five, and though Painter landed a 12-dart leg to hit back, a 101 checkout from the Scot sealed his last four place.

"I got there in the end, but I'm playing well and am happy with the way my darts are going and I'm enjoying it," said Anderson.

"Kevin hit the right scores and that 152, when I was sitting on 36 for the match, was a killer - but my 101 in the last set was great."

Anderson has won six ranking events this year to return to the world's top eight, and added: "I had two bad years when I was struggling and all I heard was about my doubles, but they were fine in practice and it's come back on stage now."

Painter admitted: "I started badly again, like I did against Adrian Lewis, and it's cost me the game tonight. I got away with it against Adrian but Gary played well in the last set, and you can't give someone like Gary a two-set start."

The other semi-final will see World Champion Michael van Gerwen - the 2012 World Grand Prix winner - taking on Stephen Bunting after they overcame Mervyn King and Richie Burnett respectively on Friday.

Van Gerwen was pushed all the way as he edged through in a dramatic deciding leg against King in a repeat of their 2012 final, which he also had to come from behind in.

King won the opening set 3-2 and then finished 149 as he moved two legs up in the second, only for van Gerwen to take out double four in leg three and back-to-back 12-darters - including a whitewash as the Englishman missed nine starting doubles - to level the game.

The third set also went all the way as King came from a leg down to edge into a 2-1 lead, only for van Gerwen to win set four without reply.

Checkouts of double ten and double three helped King into a 2-1 advantage in the deciding set, but he would never throw a dart for victory as van Gerwen levelled on double four and won the sudden-death leg on double eight.

Van Gerwen admitted: "It feels like I stole the win and in my opinion Mervyn was the better player in this game, but sometimes you need to win like this.

"It feels like I stole the win and in my opinion Mervyn was the better player in this game"

"I didn't play as well as I wanted to but Mervyn put me under pressure and I was never comfortable. I need to concentrate now on the semi-finals and tomorrow is a new day, and a win like this might give me more confidence for the semi-finals.

"It doesn't matter how you win, but winning is what counts and that's exactly what I did tonight. I can't afford to make this many mistakes in the semi-finals, but I'm up for it."

Meanwhile, Bunting's dream debut in the double-start tournament continued as he swept past Richie Burnett 3-1 to book his place in the last four.

St Helens thrower Bunting, the reigning Lakeside Champion who switched over to the PDC circuit in January, followed up his wins over Ronnie Baxter and Peter Wright with another impressive display.