Judd Trump and Neil Robertson both lost in the UK Championship third round as the seeds continue to falter in York.
World number two Trump lost to Scotland’s Graeme Dott, who trailed 2-0 but rattled off five breaks of more than 50 as he won the next six frames to claim a 6-2 victory.
Australian Robertson, the world number 10, lost 6-5 in a thrilling final-frame decider against England’s Mark Joyce.
“I have to congratulate him. He played a fantastic match,” Robertson said.
“I fired in a lot of breaks and I am not disappointed with the way I played at all. He kind of had nothing to lose.”
Robertson is one of nine top-16 seeds who are already out of this year’s event at the York Barbican.
Yet his break-building was hugely impressive at times, compiling two tons and further scores of 84 and 79 to lead 4-3 against Joyce.
- UK Championship scores, schedule and results
However Joyce made his third and fourth 50s of the match to edge ahead and although the two-time UK champion forced a decider with a slick 90, the world number 42 closed out victory in a tense decider.
Robertson will now miss the Masters in January because he will slip out of the world’s top 16.
Mark Allen, Joe Perry, Lyu Haotian, Stephen Maguire and Ryan Day were also among the round-three winners on day seven in Yorkshire.
China’s world number 82 Lyu caused a major upset with a 6-4 victory over world number seven Marco Fu, Scotland’s Maguire saw off 2015 finalist Liang Wenbo 6-5, while Day won a thrilling final-frame decider against fellow Welshman Mark Williams.
Day takes honours in all-Welsh tussle
Williams, 42, whose victory in last month’s Northern Ireland Open was his first ranking event success in almost seven years, looked set to progress after making a fine century to lead 4-1.
But he then had to play with a new tip and Day got back to 4-4 then levelled again at 5-5 before winning a tense decider thanks to his sixth break of more than 50 in the match.
“A victory like that only gives you confidence,” said Day who faces Li in round four.
“Mark is one of the best players ever to play the game.” More SPORT information please click here
Trump undone by Dott brilliance
The last time the top three seeds were out by the third-round stage was in 2007, when John Higgins, Peter Ebdon and Dott were all beaten.
This time Dott, who faces Maguire in round four, was among those handing out the shocks.
Dott, the world number 30, responded magnificently after a blistering start saw Trump knock in breaks of 93 and 78.
The 2006 world champion, whose best run at the UK Championship saw him reach the semi-finals in 2006, said: “I felt so comfortable out there. I tried to attack at every chance.”
Bristolian Trump, who won the tournament in 2011, said: “He played really well and he scored heavily. I had my chances but I didn’t really miss too many.”