Nigel Bond produced the biggest upset of the 2003 UK Championship by toppling world number seven Ken Doherty on Wednesday.
Doherty, runner-up at York's Barbican Centre for the last two years, surrendered the final three frames and bowed out 9-7.
"I'm very disappointed because the tournament has hardly started and I'm on the way home," said the Irishman.
"I don't know what went wrong though the 12th frame was a big turning point. I lost it on the black for 7-5 and it would have been four frames on the spin.
"That gave Nigel the confidence to go on and win the match."
John Parrott drew on all of his experience to earn a 9-8 win over Barry Hawkins.
The former world champion set up a second-round match against British Open champion Stephen Hendry at York's Barbican Centre.
But for most of the match, hotly-tipped Parrott seemed destined to miss out.
Hawkins dominated, leading 4-0 and then 8-6, before Parrott forced a decider, which he won after a nervous exchange on the final green.
Having lost final frame deciders to Fergal O'Brien and Andy Hicks in recent tournaments, Parrott was thrilled to progress.
"To be honest I didn't have a chance in either of those two games," he said.
"And it looked likely to be the same again today.
From 1-0 to 4-0 yesterday I was comprehensively outplayed and from 6-6 to 8-6 I don't think I missed one ball. But Barry is such a tough competitor.
Of his clash with Hendry, Parrott said: "It's going to be very difficult but I don't pretend otherwise.
"I will be the underdog but I'll just go out there, hit some balls and see what happens."
Paul Hunter was also made to sweat for his place in the second round - by Scottish youngster Stephen Maguire.
Despite back-to-back centuries and 392 points without reply at one stage, Hunter had to share the first 14 frames before sneaking a 9-7 win.
"I'm just really pleased to get through the first match and get on television," said a relieved Hunter.
Scotsman Drew Henry will meet Jimmy White in the last 32 after a 9-7 success over Nottingham's Michael Holt.
Gerard Greene, meanwhile, despatched Joe Swail 9-4 to set up a meeting with former UK finalist Matthew Stevens for a place in the last 16.
James Wattana tasted victory in the final stages of the UK Championship for the first time since 1997 when he defeated Finland's Robin Hull 9-2.
And Peter Ebdon set up a clash with Australian Quinten Hann after demolishing Stuart Bingham 9-2.