O'Sullivan trailed 9-7 overnight and, despite winning two frames in the final session, could not put fellow Englishman Carter off course as the 38-year-old calmly sealed victory.
The players shook hands before Carter, beaten in the 2008 and 2012 finals by O'Sullivan, celebrated as he looked forward to facing Mark Williams or Robert Milkins in the last eight.
(Writing by Ken Ferris; Editing by Christian Radnedge)
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