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Ronnie O'Sullivan of England competes during his second round match with Ali Carter of England at the World Snooker Championship 2018 at the Crucible Theatre in Sheffield, Britain on April 27, 2018. (Xinhua/Craig Brough)

Ronnie O'Sullivan of England competes during his second round match with Ali Carter of England at the World Snooker Championship 2018 at the Crucible Theatre in Sheffield, Britain on April 27, 2018. (Xinhua/Craig Brough)