Narrow lead for O'Sullivan

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O'Sullivan held a 5-3 overnight advantage in the battle of the two-time champions at the Crucible, and extended that to 9-5 with the help of breaks of 102, 50 and 78.

But Williams crucially hit back to claim the final two frames of the evening with breaks of 81 and 73 to trail just 9-7 going into Monday afternoon's decisive session, with 13 frames required for a place in the quarter-finals.

China's Liang Wenbo or Northern Ireland's Joe Swail will provide the last-eight opposition, and it was Liang with the upper hand after their opening session.

Liang reproduced the form which accounted for former champion Ken Doherty in the first round to open up a 6-2 lead.

In the battle of the qualifiers, Stuart Bingham leads Joe Perry 5-3 after their first session.

Bingham won three frames in a row after the mid-session interval to lead 5-2, but Perry fired a break of 65 in the last frame to limit the damage.

Meanwhile, Stephen Maguire, the new favourite for the title, leads Australian Neil Robertson 11-5.