Ronnie O’Sullivan progressed into the semi-finals of the World Snooker Championship with a 13-9 victory over Si Jiahui as ‘The Rocket’ continues his bid for a history-making eighth world title.O’Sullivan wasted little time in securing a routine 13-4 win over Pang Junxu in the second round at the Crucible Theatre and led talented youngster Si,

There are two ways to look at Ronnie O’Sullivan’s stumble into the semi-finals of the World Snooker Championship.

The seven-time champion twice saw his 22-year-old opponent pull back to within two frames before securing his 14th appearance in the last four.