World number 37 Stuart Bingham shocked Steve Davis 6-4 to reach the second round of the Masters at Wembley.
In a tight game, Bingham secured the win with a break of 54 in the final frame and will next face Peter Ebdon.
Mark Williams proved too good for three-time winner Paul Hunter, beating him 6-3 in Hunter's first Wembley match since being diagnosed with cancer.
The last match of the evening went on until near midnight, before Ian McCulloch beat Joe Perry 6-3.
Davis' defeat by Bingham was a bitter blow after his career seemed to be revived following his final appearance at last month's UK Championship.
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Perhaps I was not up for as I should have been
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"I suppose I'm disappointed, but I'm philosophical about winning and losing these days," he said.
"It was a scrappy old game and neither of us deserved to win it. The game never got off the ground."
"It was a day of hard grafting and mentally. Perhaps I was not up for as I should have been."
In the second round match, Williams led 2-0 before Hunter hit back to win the next three frames, a run of 59 in the fourth frame his best score at the table.
But the Welshman controlled matters after that to set up a meeting with either seven-times world champion Stephen Hendry or Glasgow's Alan McManus.
Williams admitted it had been a strange experience playing against close friend Hunter, knowing how ill he is.
"It's a strange experience playing him when you know he's not at his best, especially because he's a good mate," he said.
"It's amazing Paul is out there doing as well as he is. I get on really well with him and wish him all the best."