Ronnie O’Sullivan (7/2 – World Championship Outright) is facing an uphill battle to reach the semi-finals of the Betfred World Snooker Championship after falling 6-2 behind to Mark Williams while defending champion Judd Trump is also in a spot of bother at the Crucible.

O’Sullivan, whose comments about the quality of the younger players in the sport drew criticism from Ken Doherty prior to the game, did make a classy century in the second frame before the clinching the third to go 2-1 ahead.

However, that was as good as it got for the Rocket as Williams then took control of the contest, compiling breaks of 72, 56 and 130 as he rattled off the next five frames to take a 6-2 lead.

The duo will resume play on Tuesday afternoon and Williams is the 4/7 favourite in the snooker betting to advance to the semi-finals while O’Sullivan, chasing a sixth world title, is 7/5 to reach the last-four stage.

Elsewhere, defending champion Trump is facing a quarter-final exit after falling 10-6 behind to Kyren Wilson, who is just three frames away from reaching his second World Championship semi-final.

The Ace in the Pack faces a huge battle to prolong his stay in the tournament and he is priced at 18/5 to win the match, while Wilson is the firm 1/5 favourite to continue his quest for a first world title.

Another player heading for a Crucible exit is Australia’s 2010 champion Neil Robertson, who trails Mark Selby 11-5. The Jester from Leicester has been at his best against Robertson, compiling seven breaks of 50 or more.

Needing just two frames to advance, three-time champion Selby (11/4 – World Championship Outright) only has to avoid a major collapse to get over the line and it looks unlikely that will happen based on his showings so far.

Last but not least in the quarter-final stage, Anthony McGill is closing in on a first-ever semi-final appearance after he moved into a commanding 7-1 lead against Kurt Maflin, who edged past John Higgins in the last round.

Scotland’s McGill made five breaks of 50 or more and he will be hoping to keep his foot on the gas when the match resumes at 11:00 on Tuesday (McGill 1/9, Maflin 6/1 – Match Betting).

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