Phil Taylor held off a spirited fightback from Gary Anderson to move closer to a dream William Hill World Darts Championship final against defending champion Michael van Gerwen.
The 57-year-old, playing in his last tournament before retirement, claimed a 5-3 victory at Alexandra Palace to keep alive his hopes of winning a 17th world title.
Van Gerwen was made to work significantly harder on his way to a 5-4 win over Dutch compatriot Raymond van Barneveld in a thrilling quarter-final.
Taylor will meet provisional-round qualifier Jamie Lewis in the first of Saturday’s semi-finals, while Van Gerwen will take on Rob Cross.
Two-time world champion Anderson beat Taylor in the 2015 final but he was in danger of being blown away after falling 4-1 behind in double-quick time.
The Scot rallied and threatened to take the match into a decider at 2-2 in the eighth set, only for Taylor to hold his nerve to find double 10.
“It was a struggle, my energy levels went down towards the end,” Taylor told Sky Sports.
“But I just knew I had to keep putting him under pressure. Gary’s done a lot more work than me this year. He’s been everywhere, done everything and has a young baby, so it’s difficult for him.
“It’s the greatest feeling in the world hearing the fans chant my name and I’m going to miss it after this week.”
Van Gerwen is the biggest threat to Taylor’s hopes of ending his glittering career on a high and the 2016 winner displayed his champion qualities to secure a nervy win over Van Barneveld.
The top seed was in danger of exiting the tournament at the quarter-final stage after Van Barneveld made it 4-4 to set up a decider.
But Van Gerwen dug deep to avoid a repeat of his 2016 defeat at the hands of Van Barneveld.
“At the beginning Raymond was playing well and I was struggling a little bit,” said Van Gerwen.
“I think everyone could only dream of a quarter-final like this because we both averaged a quite good standard.
“I’m really glad I was the winner. He played really good. I didn’t expect him to keep his motivation up so long. He normally shakes his head when he’s behind but he didn’t do that.
“That’s a positive thing for him but the negative thing is I’m through to the next round.”
Van Gerwen will take on Cross after the 20th seed held off Dimitri Van den Bergh to claim a 5-4 victory.
Earlier, Lewis stormed into the semi-finals with a 5-0 whitewash of Darren Webster.
The 26-year-old, who defeated second seed Peter Wright before earning his quarter-final place with a 4-1 win over James Richardson, lined up a meeting with Taylor after a dominant performance.
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