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England's James Cahill competes during the first round match with England's Ronnie O'Sullivan at World Snooker Championship 2019 in Sheffield, Britain on April 22, 2019. (Xinhua/Jon Super)

England's James Cahill competes during the first round match with England's Ronnie O'Sullivan at World Snooker Championship 2019 in Sheffield, Britain on April 22, 2019. (Xinhua/Jon Super)