Two titans of the baize clash in a mouthwatering last 16 tie at the Betfred.com World Snooker Championship as three-time champion Ronnie O'Sullivan faces twice champion Mark Williams.
The duo are regarded as two of the all-time great potters and look set to contest a three-day thriller at the home of snooker.
Despite his controversial remarks regarding the venue prior to the tournament, Williams is out for a good run this year and is determined to end his miserable record against The Rocket.
Williams has never beaten O'Sullivan at the Crucible, and has suffered three defeats to the 36-year-old in the past six years in Sheffield.
In 2006, O'Sullivan beat the Welshman in the Quarter-Finals, while in 2008 and 2010 the defeats for Williams came at this stage of the competition.
The Rocket made light work of a potentially tricky opener against China Open winner Peter Ebdon and still possesses an unrivalled natural talent that is capable of winning him any tournament should he match it with the correct temperament.
The bookmakers make O'Sullivan huge the odds-on favourite at 4/11, with Williams offering possible value priced at 2/1 to progress with title sponsors Betfred
The duo have met 13 times in previous major competition, with Ronnie boasting a far superior record having taken 10 victories including 5-1 in their last at the same stage of the China Open in March.
The match will be played over three sessions across the three days, with the first starting at 2.30pm on Saturday and the climax at the same time on Sunday and Monday.
It will be streamed live over the best of 25 frames from the Crucible Theatre, Sheffield.
The winner will face Australian ace Neil Robertson in the Quarter-Finals.