- Welshman seals 13-12 victory over four-times winner
- O’Sullivan extends advantage over Si Jiahui to 7-2
Mark Williams held off a superb fightback from fellow former winner John Higgins to triumph in a last-frame decider and reach his eighth World Championship semi-final at the Crucible.
The veteran duo, who have won seven world titles between them, were locked at 8-8 at the end of their second session before Williams put himself on the verge by taking all four frames on Wednesday’s resumption.
