SHEFFIELD (AFP) - Seven-time winner Stephen Hendry admitted that retirement is an option after he was crushed 13-4 by Mark Selby in the second round of the world championship on Monday. "I'll decide in the summer," said the 42-year-old Hendry. "I'm not going to decide straight away, I've got things to think about. We'll see. "I've still got the game but I haven't got the self-belief to play with these guys." Hendry is nowhere near the force which has brought him almost nine million pounds in prize money, 36 ranking event titles and eight years as world number one. But he last won a ranking event six years ago and has not triumphed at the UK Championship, Masters or World Championship - the three most prestigious events on the calendar - this century. "If someone said you could have 26 years here, win it seven times and be in two more finals, make two 147s, I think most people would take that," said the emotional Scot. "I've not had a bad time here. I wasn't a bad player. I've won the World Championship seven times, which is a record the last time I looked." China's Ding Junhui faces a battle to stay in the world championships after slipping 9-7 down to England's Stuart Bingham in the best-of-25-frame second round. Ding, who won the Masters title in January, had fallen 3-0 behind before coming back to 3-2 with breaks of 67 and 74. Bingham pulled away again though, taking two of the next three frames to obtain a 5-3 lead to take into the second session. The Englishman then went to 8-4 in the evening before the Sheffield-based Ding responded with breaks of 93 and 75 to cut the lead to two frames. Bingham nudged three clear before Ding made 91 in the closing frame to stay in the hunt. John Higgins was not enjoying his second-round clash with Rory McLeod, but the three-time former champion remained ahead 8-5 in a mostly turgid tussle. Stephen Hendry avoided the humiliation of losing with a session to spare but the former champion looks certain to go out as he trails 12-4 against record-breaker Mark Selby. Selby became the first player to make six century breaks in a Crucible match and Hendry's hopes of reaching the quarter-finals are all but over. Selby needs just one frame more on Monday to reach the last eight for the third successive year after making history by completing half a dozen centuries. After breaks of 125, 108 and 129 on Saturday, the 27-year-old, rifled in 100, 127 and 117. Hendry was similarly punishing during his 1990s heyday but at the age of 42, and 25 years since making his World Championship debut, the Scot no longer scores so heavily. On the other table, Shaun Murphy cut former champion Ronnie O'Sullivan's lead to 9-7 to set up a fascinating final session. O'Sullivan was 6-2 ahead at the start of play, but Murphy, another former world champion, trimmed that advantage with a gritty comeback. Ding was in danger of being blown away as he fell 3-0 behind against his English opponent but he briefly stemmed the tide, with breaks of 67 and 74 enough to win the next two frames. Ding had swept into the second round with a one-sided 10-2 win over Scotland's Jamie Burnett.