Rishi Persad presents live coverage of the morning session on day 15 at the Crucible Theatre in Sheffield, featuring the third and penultimate session of the second semi-final. Mark Williams moved into a 13-11 lead over Judd Trump at this stage last year. With commentary and analysis from Steve Davis, Ken Doherty, Steven Hallworth, Stephen Hendry, John Parrott, Joe Perry, Dennis Taylor and Lee Walker