Two-time former champion Ding Junhui was knocked out 6-5 in dramatic circumstances by 19-year-old James Cahill at the Barbican Centre in York.
World ranked 100th, Cahill stormed into a 5-1 lead, the highlights being a century in frame two, and winning the sixth black ball finish. Ding hauled himself back into the contest after his opponent failed to close out the match in frame seven, rolling off three frames to reduce the deficit to 5-4.
Cahill appeared to have the match in his grasp, but a rushed shot with the rest allowed Ding to lay a tricky snooker which Cahill missed, resulting in a free ball. A tense battle on the green ensued, and a stunning pot from Ding helped send the match into a final frame.
The Chinese player looked set to close it out but missed a simple red whilst in amongst the reds. Cahill capitalised on his reprieve, pulling out some astounding pots to snatch the win in fearless fashion.
Mark Davis will challenge Cahill next, after fighting back from 5-3 down to beat Joe Perry.
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ROCKET FINDS FORM
Ronnie O'Sullivan eased into the last 16 of the UK Championship with a 6-2 win over Ben Woollaston on Wednesday afternoon.
The four-time champion, who has been suffering with a broken ankle, looked physically more comfortable in his third round encounter but was given a scare on the baize early on. After O'Sullivan the first frame, Woollaston struck back in the next and a confident break of 87 in the third gave him a 2-1 lead, but the Rocket pinched the final frame before the interval to level the score.
A more assured O'Sullivan returned after the break, rolling off all four frames to secure the victory, with notable runs of 65, 104, and 84.He will face fellow Essex player, Matthew Selt, in the fourth round.
Speaking about his ankle injury to BBC Sport after the match, the five-time world champion commented: "The first two matches I was struggling but my ankle feels fine now."
O'Sullivan, who has criticised playing conditions in the arena so far during the event, appeared much happier following his most recent success. I have to say the tables are playing unbelievably better now and well done to World Snooker for sorting that out," O'Sullivan said.
ROBERTSON SAFELY THROUGH
World number two Neil Robertson overcame a potentially tricky bout with Peter Ebdon, winning 6-2.
The defending champion took the first frame with a 74 break, but Ebdon,who won the event in 2006, dug in to win a scrappy second. From thereon however Robertson eased clear, making breaks of 108, 84, 70, and 78, in a supreme display of power scoring.
Robertson will meet Graeme Dott - who he beat to win the world title in 2010 - in the fourth round, after the Scot whitewashed Gloucester's Robert Milkins. Dott, a world champion himself in 2006, knocked in breaks of 117, 120, and 127, as his opponent continued hindered by an eye infection.
Stephen Maguire, a victor in 2004, defeated two-time winner Mark Williams 6-2 in the evening session. Maguire opened a 2-0 lead courtesy of runs of 64 and 132, and took a 3-1 lead into the interval after sharing the next two frames.
The Welshman, Williams, stole the fifth on the final black, but a series of missed chances, coupled with strong break building from Maguire, allowed the Scot to advance. David Morris will be Maguire's opponent in the last 16.
Shanghai Masters champion Stuart Bingham survived a fright from 20-year-old Joel Walker to progress. Walker, who held leads of 3-0, and 4-2, looked poised to record an upset when 35 points ahead in the deciding frame.
However, upon missing, Bingham made a classy clearance of 95 to book a fourth round match with Ricky Walden.
Former finalist Mark Allen was beaten 6-4 by Rod Lawler. The Northern Irishman created breaks of 138 and 115 to move 3-0 ahead, but was pegged back to 3-2 as Lawler made a 110 in frame five.
Allen won the next with a break of 76, but a run of four straight frames from Lawler took him into round four, where he will play Judd Trump.
FOURTH ROUND MATCHES
Thursday sees the last 16 stage get under way with the arena moving to a two-table set up.
The afternoon session sees Stuart Bingham takes on Ricky Walden whilst Anthony McGill and John Higgins clash in an all-Scottish tie.
In the evening's matches, Neil Robertson plays Graeme Dott, and James Cahill returns to action against Mark Davis.