Judd Trump became the latest big-name casualty at the UK Championship on Sunday night as he lost 6-2 to Oliver Lines in York.
Lines, whose father Peter earlier this week knocked out defending champion Neil Robertson, registered a 62 break in the opening frame before taking a 3-0 lead, with Trump reducing his arrears heading into the interval.
The world No.3 and 2011 winner of the UK Championship then took the next frame after the break but it would be the last he would win as Lines reeled off three in a row again to claim a famous victory.
He told Eurosport: "I'm speechless to beat a player of Judd's class on the biggest stage I've played on. I had a little bit of ball run in the first few frames and from those chances I managed to take them.
"I wanted to show people what I can do and what I've been doing in practice. I'm very pleased. Inside I was shaking all over the gaffe."
Earlier in the day, Mark Allen lit up the Barbican with a 147 break -- the first of his career in tournament play.
The Northern Irishman's clearance came in the seventh frame of his second round match against Rod Lawler, putting him 4-3 up. After leaving the arena to compose himself, he then completed a 6-4 victory.
Allen said he knew the clearance was on from an early stage in the break.
''The balls were sitting so nice from 24 and I was thinking about it from then,'' he told the BBC. ''The reds were all sitting, none on the cushions, and you can only mess it up from there.
''I'm very very happy to do it. It was relief when the black went in."
In other action, five-time champion Ronnie O'Sullivan cruised through with a 6-0 win over Rhys Clark and Ding Junhui overcame Ross Muir 6-2.