Ronnie O’Sullivan produced a second commanding session to retain total control of his World Championship last-16 clash with Mark Allen. O’Sullivan seized control of the contest on Friday morning, and kept his foot on his opponent’s throat in ruthless fashion to hold a 12-4 lead overnight in the race to 13. Ad/> There was the prospect of O’Sullivan repeating the feat of Mark Williams and finishing his match with a session to spare, but Allen knocked in a ton in the 14th frame to ensure the contest would conclude on Saturday.