| Venue: Crucible Theatre, Sheffield Dates: 16 April-2 May |
| Coverage: Watch live on BBC TV and Red Button with uninterrupted coverage on BBC iPlayer, the BBC Sport website and the BBC Sport app |
Defending champion Mark Selby was knocked out of the World Championship after a match featuring the longest frame in Crucible history.
The 22nd frame lasted 85 minutes and 22 seconds, beating the previous longest by five minutes and 51 seconds.
The marathon frame was lost by Selby as he looked to level and he was beaten 13-10) by China's Yan.
Mark Williams is a three-time champion.
After a heavy defeat at the Masters, Selby spoke openly about his struggles with mental health issues and considered not defending his title.
He said he had seen a little bit of improvement, which helped his decision to enter the World Championship but ultimately a difficult campaign ended without any silverware.
He is known for his determination, grinding down opponents in long drawn battles, but on this occasion he was on the receiving end of his mental and tactical fortitude.
The 22nd frame will go down in history, a lengthy exchange that ended withYan pinching it on the final black, securing the victory with a superb century.
The frame was one and a half hours.
He had a good chance to level at 11-11 but he missed the last pink and was nervous. I just needed one more chance after he gave me an easy chance.
Asked if he could go all the way and win the title, he said, "Maybe, who knows." I will win if I play like the last frame.
Yan is a great all-round player, you have to beat him, he doesn't give anything to you. He plays some very clever shots. I have a lot of respect for him.
I wish I was as good as he is. He has the game to win it for me. To not be scoring and not be at your best, you have to scrap it out.
After the first session of their second-round match, Judd Trump and Anthony McGill were tied at 4-4.
Trump and McGill each made a century in an otherwise boring encounter.
Neil Robertson and Jack Lisowski are both tied at 4-4 with both matches to resume on Sunday.
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