What is the greatest comeback in World Snooker Championship history?

Can Mark Williams pull off a great comeback? (Picture: Getty Images)Mark Williams is trying to pull off an epic comeback in the World Snooker Championship final on Monday, but it would not be the biggest in Crucible history.The Welshman is taking on Chinese star Zhao Xintong and, like everyone before him in Sheffield this year, is finding it very difficult.After thrashing Ronnie O’Sullivan 17-7 in the semi-finals, Zhao continued his brilliant form by starting the final in rampant fashion.