SHEFFIELD (England), April 23: Two-time former champion Mark Williams joined title-holder Shaun Murphy in the quarterfinals of the world snooker championship on Saturday.

Welshman Williams, who completed a 13-8 victory over England's Mark Selby, could face world number one Ronnie O'Sullivan in the last eight.

However, the 31-year-old is not daunted by the prospect.

Defending champion Murphy eased through with a 13-7 win over six-time former champion Steve Davis.

Qualifier Marco Fu of Hong Kong beat world number three Stephen Maguire of Scotland 13-4 to reach the last eight.

Last year's losing finalist Matthew Stevens of Wales and Irishman Ken Doherty, who won the title in 1997, are level in their second round match at 4-4.

Saturday’s results:

Second round (best of 25 frames):

Mark Williams (Wales) bt Mark Selby (England) 13-8 (81-20, 66-52, 91-0, 7-108, 0-92, 58-13, 38-76, 13-78, 77-23, 80-57, 31-58, 61-41, 78-37, 0-127, 137-0, 87-1, 24-107, 0-71, 86-4, 0-73, 62-60); Shaun Murphy (England) bt Steve Davis (England) 13-7 (115-1, 76-6, 63-28, 0-89, 63-61, 71-30, 69-16, 14-67, 76-8, 91-23, 48-59, 74-51, 82-30, 1-75, 23-70, 76-16, 94-1, 19-89, 7-66, 66-13); Marco Fu (Hong Kong) bt Stephen Maguire (Scotland) 13-4 (111-9, 66-45, 125-1, 74-0, 40-73, 67-49, 86-6, 57-25, 0-81, 66-45, 120-0, 0-95, 63-9, 69-30, 83-15, 55-16, 101-24); Graeme Dott (Scotland) leads Nigel Bond (England) 5-3 (69-33, 91-11, 21-64, 11-94, 62-53, 114-9, 77-27, 15-56); Matthew Stevens (Wales) is level with Ken Doherty (Ireland) 4-4 (75-37, 41-66, 57-65, 11-88, 58-18, 89-0, 0-76, 82-5).—Reuters