The reigning world champion Ronnie O'Sullivan is seen on a big screen in Sheffield city centre before his return to the world stage where he was taking on world No 27 Marcus Campbell Photograph: Tom Jenkins for the ObserverThere's a thumbs up to the crowd as he enters the arena to rapturous applausePhotograph: Tom Jenkins for the ObserverO'Sullivan won the first frame with an 82Photograph: Tom Jenkins for the ObserverO'Sullivan sticks his tongue outPhotograph: Tom Jenkins for the ObserverLining up a shotPhotograph: Tom Jenkins for the ObserverMissed opportunities in the third and fourth frames proved costly for Campbell as O'Sullivan went into the mid-session interval 3-1 aheadPhotograph: Tom Jenkins for the ObserverDoesn't look like Ronnie likes the lie of the cue ballPhotograph: Tom Jenkins for the ObserverA high bridge takes the cue above some pesky redsPhotograph: Tom Jenkins for the ObserverO'Sullivan lines up a shot closely watched by referee Jan Verhaas Photograph: Tom Jenkins for the ObserverFor some reason that Chas and Dave snooker song comes to mindPhotograph: Tom Jenkins for the ObserverO'Sullivan looks worried, maybe he's seen those fans' headgearPhotograph: Tom Jenkins for the ObserverO'Sullivan looks quietly confident as he watches Marcus Campbell chalk his cue. He had good reason to be, at the end of the first session he was leading 7-2 Photograph: Tom Jenkins for the ObserverOne of the many O'Sullivan fans inside the CruciblePhotograph: Tom Jenkins for the ObserverAt the start of the second session O'Sullivan made it 9-2 with scores of 102 and 90Photograph: Tom Jenkins for the ObserverO'Sullivan seen on a TV cameraPhotograph: Tom Jenkins for the ObserverCampbell responded to make it 9-4 Photograph: Tom Jenkins for the ObserverO'Sullivan sealed a 10-4 victory in a scrappy final frame. He will meet either fellow Essex player Ali Carter, who he beat 18-11 in last year's final, or Crucible debutant Ben Woollaston in the second roundPhotograph: Tom Jenkins for the Observer
