World Ranking: 3
Provisional Ranking: 2
Date Of Birth: 05/12/75
World Championship best: Winner - 2001

Always regarded as the player with the most natural talent on the tour, yet O'Sullivan has only won the greatest prize once.

Capable of some breathtaking snooker, the 'Rocket' is just as likely to turn up and play as if he isn't interested.

That is summed up by last season's first-round defeat here when he lost to Marco Fu.

O'Sullivan regularly admits his lack of interest in the game, one such admission coming recently in Dublin.

It is such mental problems which have always been the flipside to his expansive game.

The bookies remain wary of his talent, but for punters not knowing which Ronnie will turn up has to be worry.

Form this season suggests he should make a good fist of a title bid.

In terms of tournament progress, O'Sullivan has been the most consistent player.

His recent form includes victory at the Welsh Open, but whether he can repeat that success here remains to be seen.