The Juddernaut lost 6-3 to close pal Matt Selt at the Barbican having come to York as title favourite after winning the Champion of Champions.
The 2011 winner joins Stephen Hendry, Jimmy White, John Higgins, Mark Williams, Mark Selby, Neil Robertson, Ding Junhui, Shaun Murphy and Matthew Stevens on the sidelines.
And world No2 Trump cannot see any other outcome than O’Sullivan extending his own record by winning the UK Championship for an eighth time.
He said: “Every tournament is Ronnie’s to lose in people’s minds. He is the favourite in any event, and looks like he is playing the best. He must be favourite to win eight.
“I was poor really – crap from the start to the finish.
“I had my chances and should have gone 3-1 up, and then should have levelled at 4-4. I just didn’t settle, and I don’t enjoy the venue or playing here.
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“The event is so stop-start, you play then two days off, play again then another two days off – it all just takes too long and my concentration wasn’t there.”
World No35 and former Indian Open champion Selt, 36, said: “It is a very satisfying win, and probably the best of my career. I’d give it about a 9/10.
“Judd missed a few which he doesn’t usually but that was good for me. Even blind squirrels find acorns now and again.
“My form and confidence is good since changing my cue about a year ago. I would love to win a title in the UK, my only one previously came in India.
“But really I would love to win another one wherever it is in the world, and one that had a few good players in it. I’m told by some kind people that the one that I won didn’t have any!”
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