Tournament favourite O'Sullivan made a slow start to the evening as Stevens picked up the opening two frames including a break of 82.

O'Sullivan's looked frustrated when he missed a red in the third frame as he thumped his cue of the side of the table.

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The cue visibily wilted, but did not snap as O'Sullivan returned to the table to make a quickfire 100 in reducing the deficit to 2-1.

He would proceed to snare the next four frames with breaks of 63 and 61 in the fifth and sixth frames.

O'Sullivan managed to pinch the seventh frame for a 5-2 lead despite Stevens making 55, but the Welshman finished with a 71 to trail by two before Sunday afternoon's second sesson.

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In the other action of the evening, 2013 finalist Barry Hawkins recovered from trailing 9-6 and 11-8 to complete a rousing 13-11 win over Mark Allen.

The turning point came in the 17th frame when Hawkins escaped from a snooker to trail 9-7 before the final session.

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Latest last 16 results (best of 13 frames)

Mark Selby (Eng) 9-13 Anthony McGill (Sco)

Joe Perry (Eng) v Shaun Murphy (Eng)

Barry Hawkins (Eng) 13-11 Mark Allen (NI)

Ali Carter (Eng) 2-6 Neil Robertson (Aus)

Ding Junhui (Chn) 13-9 John Higgins (Sco)

Marco Fu (HK) v Judd Trump (Eng)

Graeme Dott (Sco) 5-13 Stuart Bingham (Eng)

Matthew Stevens (Wal) 3-5 Ronnie O'Sullivan (Eng)

Quarter-final draw

Anthony McGill (Sco) v Joe Perry (Eng) or Shaun Murphy (Eng)

Barry Hawkins (Eng) v Ali Carter (Eng) or Neil Robertson (Aus)

Ding Junhui (Chn) v Marco Fu (HK) or Judd Trump (Eng)

Stuart Bingham (Eng) v Matthew Stevens (Wal) or Ronnie O'Sullivan (Eng)

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