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Ronnie O'Sullivan revealed he was still ravaged by self-doubt despite completing a stunning demolition job on Ali Carter to secure his place in the second round of the World Snooker Championship at the Crucible.

The seven-time champion fired three centuries and two more breaks over 50 as he took just 67 minutes to turn a tight and error-strewn overnight 5-4 lead into a stunning 10-4 triumph over the double former finalist.

O’Sullivan’s display made a mockery of his recent period of inactivity, having arrived in Sheffield without a tour match to his name since he stuffed his cue in the bin after crashing out of the Championship League in January.

But appearances can be deceptive and the 49-year-old said he had been plagued by thoughts that he had made the wrong decision since he committed to taking his place in the tournament in the middle of last week.

"I thought, what am I doing, coming here and exposing myself, imploding out there, having a meltdown – all that went through my head," admitted O’Sullivan.

"I was a bit scared about playing. It is a daunting venue to play at anyway, but it’s just about getting on the bike again and playing. I’m really happy that I’ve done it, even if I’d lost it didn’t matter – I’ve made the breakthrough now."

Carter had done well to pull within one by the end of Tuesday’s opening session, but he failed to score a point in the first two frames upon the resumption as O’Sullivan dispatched breaks of 59 and 117 to extend his overnight lead to 7-4.

Carter blew it again in the 12th frame, running out of position on 28, and, clearly in no mood to hang around, O’Sullivan produced a clearance of 74 followed by further centuries either side of the interval to complete his win.

O’Sullivan’s performance saw