Peter Ebdon was furious with himself after a bad error cost him a maximum break in his 4-2 win over Mark Selby at the Royal London Watches Grand Prix.
An Ebdon 147 would have been the event's second in three days
The 2002 world champion missed an easy final pink and said: "I missed it by a mile, it was an unforgivable miss.
"I haven't made a 147 for 15 years, and I've always wanted to make one on TV.
"I'm gutted to be honest. I'll have a few sleepless nights about that. I couldn't have missed that more if I'd deliberately tried to miss it."
If Ebdon had potted the pink and the black, he would have matched Tom Ford's maximum on Sunday and shared the £20,000 prize money for the 147, as well as an additional £4,000 for the highest break prize.
His win booked him a place in the last 16 and eliminated Selby, who was runner-up in the World Championship earlier this year.
Seven-time world champion Stephen Hendry, meanwhile, needed a clearance of 35 from the last red in the deciding frame to keep alive his hopes.
He beat Barry Hawkins 4-3 but faced certain elmination had Hawkins, 46-10 in front with the match level at 3-3, won the frame.
Graeme Dott is out of the reckoning after losing 4-0 to Anthony Hamilton, his third successive defeat, while world champion and world number one John Higgins cruised to a 4-0 win over Mark King.
Higgins had breaks of 119, 76 and 64 and heads Group H with the same record of three straight wins as Welshman Ryan Day, who fired in a 114 and 107 in beating Tian Pengfei of China 4-0.
But Irishman Ken Doherty kissed goodbye to his hopes after losing 4-3 to Ian McCulloch, a third loss which left him propping up the six-player group headed by unbeaten Ricky Walden.
Earlier, defending champion Neil Robertson crashed out after a 4-2 defeat in his final group match against Stephen Lee, Joe Perry beat Joe Swail 4-2 to finish runner-up in their group.
Also through to the last 16 stage is Chinese prospect Liu Song, who beat Dubliner Joe Delaney but Matthew Stevens is out despite beating Dave Harold 4-1 in his final group game.