Ian 'Diamond' White rattled off three sets in a row and won eight of the last 10 legs to edge former Lakeside champion Richie Burnett 4-3 and reach the quarter-finals of the PDC World Championship.
Welshman Burnett, who was aiming to reach the last eight of the tournament for the first time in 11 years, raced into a 3-1 lead, but then relaxed.
Potters' thrower White hit double eight to make it 3-2 and it was soon level pegging with the help of a 111 finish and a 13-dart-finish in the sixth set.
White took the lead for the first time in the match at the start of the deciding set following a clinical 101 finish on double top, before another 13-darter helped him break Burnett's throw.
It was all over in the next leg as the world No 18 hit double top to set up a meeting against 2011 beaten finalist Simon Whitlock or 2004 runner-up Kevin Painter.
In the first of the last 16 clashes, England's Wes Newton breezed past Robert Thornton 4-1 to reach the quarter-finals for the third time in four years.
The pair traded breaks in every leg of the opening set, but it was Fleetwood flyer Newton who dispatched double 10 to take it.
The world No 8, who hammered John Part 4-0 in the last round, took advantage of Thornton's profligacy on the doubles to race through the second set 3-0.
However, the Scotsman quickly upped his averages before taking out double top for the first time in the match to get himself back into the contest.
But back came 'The Warrior' to whitewash an out of sorts Thornton in the fourth set and it was all over in the next when the 36-year-old nailed double four to set up a meeting with either Michael Smith or Peter Wright in the last eight.
"I expected a really tough game, but it didn't turn out like that," admitted Newton, who averaged 95.51. "I'm not playing how I can but I'm doing enough. It's my own determination and will to win that's getting me through. I'm not playing bad but I know there's a lot more to come from me."
The last non-seeded player left in the PDC World Championship Devon Petersen caused a huge upset by knocking out Justin Pipe 4-1 and set up a last 16 meeting with James Wade.
Petersen stole the opening set against the throw, but only after 'The Force' missed three darts at the double in the fourth leg.
The scoring picked up in the next set and it was the three-time South African Masters champion who took control, reeling off three straight legs and averaging 112.7 to move 2-0 up.
The 11th-seeded Pipe responded by taking the third set and he fought back from two legs down in the next, but 'The Spartan' took out a 130 finish on the bull to re-establish his two-set lead.
Petersen, who upset former BDO world champion Steve Beaton in the last round, then produced a 14-dart leg at the start of the fifth set to break Pipe's throw. He hit double 11 with his final dart in the third leg before closing out the match with double 18 to dance into the next round.
Petersen, who recovered from injuring his arm and wrist just six months ago, is now looking forward to taking on Wade on Saturday afternoon for a place in the quarter-finals.
"You learn that something so natural is taken away from you in an instant and you start to appreciate what you have," the 27-year-old from Cape Town told Sky Sports. "It's just another game (against Wade). First to five sets, that's all we need to do so best of luck to him as well."