- World Championship
O'Sullivan trails Perry at Crucible
Defending champion Ronnie O'Sullivan will head into Saturday's final session of his second-round match with Joe Perry 9-7 down at the World Championship in Sheffield.
O'Sullivan has not led at any stage of the best-of-25 game, with Perry maintaining his two-frame advantage having led 5-3 overnight.
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O'Sullivan took the first frame of the second session with a break of 93, the highest of the day, before Perry won four out of the subsequent six frames to open up a 9-6 lead.
Both players spurned good chances in the final frame of the day before O'Sullivan cleared from yellow to pink to triumph 68-38 and cut Perry's lead going into Saturday morning's session.
Mark Selby became the first player into the quarter-finals after completing a 13-9 win over Ali Carter on Friday evening.
Selby, a finalist in 2007, reached the last eight for the first time in three years and will face the winner of Alan McManus and Ken Doherty, whose second-round tie is tightly poised at 4-3 after the opening session.
Elsewhere, Ricky Walden pulled clear of Barry Hawkins to take advantage of their match and lead 9-6 going into Saturday's final session.