Adrian Lewis successfully continued the defence of his Ladbrokes World Darts title with a 5-3 win over Terry Jenkins, as Simon Whitlock, James Wade and Andy Hamilton also booked their place in the Semi-Finals.
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Lewis began his quarter-final in fine style, powering into a 3-0 against a seemingly deflated Terry Jenkins.
Jenkins, though, won the fourth set and kick-started his fightback by coming from 2-0 down in the fifth, winning six straight legs to level the game.
Lewis won a crucial seventh set 3-1 and then came from a leg down in the next to seal victory and set up a semi-final with world number three James Wade on Sunday.
"I took the 3-0 lead and thought I was going to win 5-0, but Terry came back brilliantly," said Lewis. "Every dart I threw for a while in those three sets was on the wire and Terry put me under pressure.
"As soon as I'm under pressure, I fire, and I'm in the semi-finals now. Wadey's got a good record against me but I'm ready for a battle."
2010 runner-up Whitlock, meanwhile, set up a semi-final against Andy Hamilton with his 5-1 win over last year's beaten finalist Gary Anderson, who had been the favourite with sponsors Ladbrokes going into the quarter-finals.
The Scot took the game's first set but would win only seven more legs in the match as Whitlock took five successive sets to storm to victory, continuing to defy the discomfort of his recovering broken ankle.
"I'm over the moon," said Whitlock. "Gary missed a lot of doubles which made it easier for me, but I concentrated on my darts and enjoyed the game.
"I fully believe I can win this World Championship, even with a broken leg! I actually think it's helped me because my concentration levels are higher and I'm going slower and trying to make every dart count."
Left-hander Wade had earlier won his second World Championship semi-final place with victory over Canadian ace John Part in a sudden-death thriller.
Part hit back from 3-1 down to lead 4-3, before Wade levelled and forced a decider which went all the way to an 11th leg which the world number three took with a fine 14-darter.
Hamilton powered to a 5-1 win over Belgium's Kim Huybrechts in the other quarter-final, hitting 11 180s, three ton-plus finishes and averaging over 102.
Lewis is now the 13/8 favourite to lift the £200,000 title on January 2, with Whitlock 9/4, Wade rated at 5/2 and Hamilton the 6/1 outsider in his bid for a first major title.
Ladbrokes World Darts Championship
Friday December 30
Andy Hamilton 5-2 Kim Huybrechts
John Part 4-5 James Wade
Simon Whitlock 5-1 Gary Anderson
Adrian Lewis 5-3 Terry Jenkins
Sunday January 1 (7.30pm)
Andy Hamilton v Simon Whitlock
Adrian Lewis v James Wade
Best of 11 sets