About this programme

Ronnie O'Sullivan v Mark Williams. Hazel Irvine is joined by Steve Davis and John Parrott to present coverage of the opening best-of-11-frames semi-final at Wembley Arena, where O'Sullivan is the reigning champion. The Rocket defeated Stephen Maguire 6-1 at this stage last year and has reached five of the last six finals. Commentary by Dennis Taylor, Willie Thorne, John Virgo and Ken Doherty. Coverage continues on BBC2.