many times: Hendry, Steve Davis, Jimmy White, Terry Griffiths, John Parrott, Peter Ebdon, Willie Thorne and O'Sullivan. Ali Carter trailed Judd Trump 9–12, but won the next four frames to win 13–12. In the deciding frame Trump needed four and got three, before Carter finally potted the last remaining red ball. Crucible debutant Jones reached his first ranking event quarter-final by defeating Andrew Higginson 13–10. After the second session Jones led 10–6; before Higginson won the four opening frames of the last session to tie the score 10–10. Jones took the next three frames to win the match. He became the third Welshman into this year's quarter-finals, following Day and Matthew Stevens. Robertson led Gilbert 5–3 and 10–6 before winning 13–9. Day defeated Cao 13–7 to reach the quarter-finals for the third time. Eighth seed Maguire defeated Perry 13–7, whilst O'Sullivan defeated Williams 13–6, having won six frames in a row in the second session. Quarter-finals The quarter-finals were played on 1 and 2 May as the best of 25 frames, held over three sessions. Hendry was defeated by Maguire with a , 13–2. Hendry won only one of the eight frames in the opening session, with Maguire winning the first four frames of the second session. Hendry won frame 13, but Maguire won the next two frames to complete the victory. After the match Hendry announced his immediate retirement from professional snooker, citing dissatisfaction with his standard of play in recent years and difficulty balancing competitive, commercial and personal commitments. Hendry would be in retirement until 2020, when he announced he would play again on the Tour, playing his next professional event at the 2021 Gibraltar Open. Stevens played Day, but trailed 2–5 in the first session. He won the final frame of that session, all eight frames of the second session, and won the match 13–5 after taking the first two frames of the third session. This was the first time he had reached the semi-finals since he played in the 2005 final. Carter led 2–1 before Jones tied the scores with a break of 127. However, Carter won three of the next four to lead 5–3 after the first session. Jones completed back-to-back centuries in the second session, but still trailed by two frames after the second session, with Carter winning the match 13–11. Robertson took a 5–3 lead over O'Sullivan after the first session of their