World number 35 Ryan Day became the latest Crucible giant killer as he edged out Ding Junhui in a dramatic last frame decider to book his place in the last 16.
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The Pontycymmer Potter reeled off the final four frames to complete an incredible comeback from the brink of defeat at 9-6 down.
In a topsy-turvy second session, Day opened up with a break of 70 to extend his advantage to 6-4, only for Welsh Open champion Ding to win the next five frames with top runs of 38, 52, 56, 69 and 57.
Day however was not to be denied and kept himself in the hunt by knocking in breaks of 57 and 79 in the next two frames to close the gap 9-8. He then won a nervy 18th frame to force the match into a nail-biting decider.
China's number one Ding was first to the table, but broke down on 48 after missing a simple red with the rest, allowing Day to step in and make a cool 64 to seal a famous victory and set up a last 16 tie with Cao Yupeng.
Ding, many people's tip for the title, becomes the seventh seeded player to exit the competition at the first hurdle, along with the likes of Shaun Murphy, Mark Allen, Stephen Lee and Graeme Dott.
The youngster, a resident of Sheffield, expressed his frustration in his post-match press conference at what he felt to be harsh treatment by the fans.
"I don't think the table was right, I don't think the fans were right, all rubbish," said Ding.
"I try to concentrate on the shot and the fans keep shouting, not fair," he added.
Tournament favourite Judd Trump came through a tricky opener against former ranking event winner Dominic Dale 10-7, avoiding a potential scalp to progress to the second round.
The youngster took a slender 5-4 lead into this afternoon's final session and finished off the job without leaving third gear.
Last year's finalist Trump was struck down with food poisoning hours before he was due to start the match yesterday and it was clear he had still not fully recovered.
Despite missing an array of long pots, he made Dale pay for missed chances and won four frames on the spin from 7-6 down (including a century break) to go one away from victory, eventually sealing a 10-7 win over the plucky Welshman.
Mark Williams was given a frosty reception as he stepped out into the Crucible to face Chinese qualifier Liu Chuang.
Williams, another cueist flying the flag for Wales, landed himself in hot water over comments made on Twitter expressing his hatred of the venue last week, but let his cue do the talking this afternoon as he finished the first session 6-3 in front, ending with a superb 111 break.
Elsewhere Joe Perry took just 30 minutes to finish off an out of sorts Graeme Dott 10-1 and inflict the heaviest defeat of the tournament so far.
Hear what Ryan Day and Judd Trump had to say about their victories below...
