The return of Ronnie O'Sullivan - in pictures

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 Observer

There's a thumbs up to the crowd as he enters the arena to rapturous applause Photograph: Tom Jenkins for the Observer

O'Sullivan won the first frame with an 82 Photograph: Tom Jenkins for the Observer

O'Sullivan sticks his tongue out Photograph: Tom Jenkins for the Observer

Lining up a shot Photograph: Tom Jenkins for the Observer

Missed opportunities in the third and fourth frames proved costly for Campbell as O'Sullivan went into the mid-session interval 3-1 ahead Photograph: Tom Jenkins for the Observer

Doesn't look like Ronnie likes the lie of the cue ball Photograph: Tom Jenkins for the Observer

A high bridge takes the cue above some pesky reds Photograph: Tom Jenkins for the Observer

O'Sullivan lines up a shot closely watched by referee Jan Verhaas Photograph: Tom Jenkins for the Observer

For some reason that Chas and Dave snooker song comes to mind Photograph: Tom Jenkins for the Observer

O'Sullivan looks worried, maybe he's seen those fans' headgear Photograph: Tom Jenkins for the Observer

O'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 Observer

One of the many O'Sullivan fans inside the Crucible Photograph: Tom Jenkins for the Observer

At the start of the second session O'Sullivan made it 9-2 with scores of 102 and 90 Photograph: Tom Jenkins for the Observer

O'Sullivan seen on a TV camera Photograph: Tom Jenkins for the Observer

Campbell responded to make it 9-4 Photograph: Tom Jenkins for the Observer

O'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 round Photograph: Tom Jenkins for the Observer