Neil Robertson racked up a maximum break but crashed out of the World Championship in a 13-12 defeat to Jack Lisowski.
Robertson achieved the 12th 147 in Crucible history in the 19th frame of the match but it was not enough to prevent his shock loss to the tournament's 14th seed.
Lisowski described his win as "the best of my career" and added: "I gave that everything I had, and to beat the best player in the world who is playing some of the best snooker we’ve ever seen, it just feels like a massive achievement.
"I held it together well out there. There’s a lot of pressure and I kept my cool really well. I missed a few balls but I made a great clearance to take it into a decider, and I finished it off well in the end."
Lisowski, rated the best current player not to win a ranking event by many, had exceeded expectations by carving out a 9-7 overnight advantage and when he took a scrappy opener to extend his lead to three frames, a major upset looked on the cards.
But the 30-year-old was frequently let down by careless shot choice, and a poor safety in the next let in Robertson to clear the colours and narrow the deficit to two frames.
Robertson followed his 147 with back-to-back breaks of 79 and 60 to take the lead, but when it seemed the momentum had shifted, Lisowski responded again with an 88 to haul an intriguing match back all-square at 11-11.
A shocking missed green in the next again appeared to spell Lisowski’s demise, as Robertson took the frame and established a potentially match-winning lead in the next – only for Lisowski to respond with a stunning 72 to pink to force the decider.
As nerves took centre-stage, both players missed fine opportunities to build a lead but a misjudged safety by Robertson let in his opponent, who held his nerve to pull away and claim a potentially breakthrough victory.
Robertson took some solace from his maximum, insisting: "It just tops the season off because it’s on everyone’s bucket list to make a 147 at the Crucible and my mum was in the crowd as well."
Defeat for the 40-year-old extended his dismal record at the Crucible, having reached the one-table set up just once since he won his solitary title in 2010.
But he added: "If I only win it once, I’ve had an unbelievable career, I’ve achieved everything I could ever dream of 100 times over.
"The season I’ve had has been the season of absolute dreams. If I’d gone on to win here, it would probably have been the greatest season anyone has had in the sport.
"But Jack played the match of his life. It was an incredible match and it was played in the right way. I’ve got nothing but praise for Jack because he really just handled himself really well."
Judd Trump, Lisowski’s close friend who clawed through similar drama to beat Anthony McGill 13-11, was the first to pay tribute, admitting: "I am over the moon for Jack.
"I wasn’t sure he believed in himself enough to win that game, but that is a huge, huge win for him and especially to do it in the way he did."
McGill trailed 10-6 and 11-7 before successive breaks of 78, 77 and 124 lifted him to within one frame at 11-10.
Despite some stunning pots from the Scot, Trump managed to keep his nose in front and a break of 56 to blue in the 24th frame proved enough to seal a place in the last eight.
"Anthony played amazingly but he left himself too much to do," admitted Trump. "I’m very happy that he didn’t produce that in the first two sessions because on that kind of form you can see why he’s so good here.
"I was praying it wasn’t going to go to a decider. If I’d lost I wouldn’t have taken it well, but I would have come off feeling good and it was one of the best sessions I’ve been involved in."
Earlier in the day, John Higgins reached the quarter-finals for the 16th time after wrapping up a 13-7 win over Noppon Saengkham.
The 46-year-old Scot did the damage in Sunday night's second session when he reeled off seven frames in a row to move two away from victory at 11-5.
He won the first upon their resumption but then watched a mini fightback from his opponent, who reduced the deficit to 12-6 then came agonisingly close to a maximum before hitting a tough last red into the jaws.
"Last night was obviously massive for me and it left me with one foot in the quarter-finals but you’ve got to stay professional and get those extra few frames," said Higgins.
"I feel like I’m starting to get a bit of rhythm going. You need to try and build up in this tournament – you very rarely look at past champions who have gone through the card and blitzed people."
Stuart Bingham stepped on the gas to sink Kyren Wilson 13-9.
Resuming at 8-8, Bingham won the opening frame of the day before three consecutive half-centuries took him one away from victory.
Wilson cleared the colours to claim a tense 21st frame and keep his hopes alive, but missed his chance in the next as Bingham progressed.