Ken Doherty has beaten Ronnie O'Sullivan in the Benson and Hedges Masters quarter-final by six frames to five to set up a semi-final meeting with either Stephen Hendry or Jimmy White.
The game went right down to the wire with Doherty claiming the last frame after a break of 59 to win.
"I'm disappointed to lose but you can't take it away from Ken," said O'Sullivan, who has only one Masters title to his name from 10 visits to the Conference Centre.
"He made a great break in the last and deserved to win.
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"I thought I played the wrong shot to let Ken back in and that's a lesson I can take away from here. Hopefully, I will never do it again.