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

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