Alarm bells ring loud for Williams.
The match featured an unusual incident early on when Selby, who was on a break of 26 in frame two, was interrupted by a fire alarm which forced the Crucible Theatre venue to be evacuated.
When play resumed after a half-hour delay the 22-year-old extended his break to 52, but it was not enough to win the frame.
Neil Robertson believes he is developing an all-round game that could carry him all the way to the title.
The fast-emerging Australian talent is renowned for his brilliant long potting, but his tactical awareness has so far stopped him from winning a major title at senior level.
That was particularly evident at the UK Championship last December when the man dubbed the 'Melbourne Machine' was beaten 9-5 in the quarter-finals by Ding Junhui, who went on to lift the trophy.
But since then the 24-year-old has focused on improving the other skills he will need if he is to triumph at Sheffield having reached the last eight with a 13-9 win against Stephen Lee.
'When I lost to Ding at the UK Championship my positional play was diabolical and I think that could have cost me the tournament,' said Robertson.
'I spoke to Terry Griffiths (1979 world champion, now a snooker coach) who gave me a few ideas and I have been working really hard for the last few months. It seems to be coming together.
'If I play as well as I can then I have no need to fear anyone and the longer matches suit my style of game.
'I still take on the odd lunatic shot here and there which in a short match you get punished for, but in a longer contest you can get away with it a bit.'
It has certainly been a tournament for the young brigade progressing at the expense of the old guard so far, with Stephen Hendry, Jimmy White and John Parrott already having gone home.
Today they look highly likely to be joined by Steve Davis, who will resume 11-5 down to defending champion Shaun Murphy after another devastating potting display by the 23-year-old.
Fourth seed Stephen Maguire is another player in trouble as he fell12-4 behind to Marco Fu.
But a terrific display by the Hong Kong player was tainted when he was caught up in a moment of controversy in the final frame of the second session.
On a break of 22, Fu potted a red with the rest but clearly clipped the blue with his cue after the shot. The foul was not spotted by referee Eirian Williams, and Fu continued with his break to make a 47 and clinch the frame.
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|Publication:||South Wales Echo (Cardiff, Wales)|
|Date:||Apr 22, 2006|
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