Mark Williams has produced the highest break of the tournament to ease into the last 16 of snooker's world championship in Sheffield.
Williams, twice a winner of the event at The Crucible, compiled a total clearance of 140 on his way to a 10-5 win over Jimmy Robertson.
The 43-year-old Welshman held a 7-2 lead after the first session, but Robertson threatened a comeback by winning a scrappy opening frame and stealing the next with a 55 clearance after Williams had been first in with a break of 54.
However, Robertson paid the price for missing a tough opening red along the cushion in frame 12 and Williams took full advantage with a total clearance, before moving within a frame of victory with a break of 100 in the next.
Robertson kept his hopes alive by winning the 14th frame but Williams was not to be denied and secured the victory to set up a last-16 clash with Australia's Neil Robertson or Robert Milkins.
Milkins takes a 6-3 lead over former world champion Robertson into Wednesday afternoon's decisive second session.
