Hendry was visibly stunned as O'Sullivan shook his hand and walked out of the Barbican Centre arena.

"He just said he had had enough," said Hendry, who was awarded a 9-1 win. "I had no inkling anything was wrong."

Hendry's semi-final opponent will be either reigning world champion Graeme Dott or Steve Davis.

O'Sullivan was 24 points ahead when he missed an attempted pot and immediately declared the match over, shaking the hand of Hendry and referee Jan Verhaas.

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