Ronnie O'Sullivan on verge of semi-final spot; Mark Williams unable to shake off Yan Bingtao
The six-time world champion built on a fine morning session to help himself to a 11-5 overnight lead in the best-of-13 clash.
O'Sullivan quickly wrestled control of the match back, though, winning the next five frames in succession.
Mark Williams finds himself in a real fight to book his semi-final spot, though, with Yan Bingtao holding him to 8-8 overnight.
They don't get much better than that.
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