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O'Sullivan went on to make a 110 break in the 24th frame, the fourth consecutive frame won with a century.
And the Australian - who had a 97% pot success rate in his win over Ali Carter - took the third, but O'Sullivan, who struggled throughout, made a 101 break in the fourth frame to go two frames behind.
Cao reeled off three frames in a row - featuring a superb 125 break in the 10th frame - to get to within one frame of Day at 6-5.
Ding, 28, got himself off the mark in style with a 135 break in the third frame, but Higgins looked on course to build a dominant advantage when he won the next three frames.
The five-time champion almost recorded a maximum break in the first frame, potting 13 reds and blacks, but suffered discomfort four frames later.
But Williams battled to a fine 73 break in the following frame and backed it up with breaks of 59 and 54 in frames five and six.
Ebdon refused to be deflated after losing seven of 10 frames and used all of his considerable experience to dig deep for a 103 break in the 17th frame.
Looking distinctly unimpressed at times, O'Sullivan produced a 67 break in the sixth frame and an 81 in the eighth to level it ahead of today's action.
Carter's best moment was his century break in the fourth frame but he missed a hatful of chances in the sixth.
Even on a 60 break in the 30th frame, those nerves remained raw and contributed to a missed short-range red.
Lines, whose father Peter earlier this week knocked out defending champion Neil Robertson, registered a 62 break in the opening frame before taking a 3-0 lead, with Trump reducing his arrears heading into the interval.
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