Defending champion Mark Selby scraped through to the quarter-finals of the Dafabet Masters, after overcoming Mark Davis 6-5 at the Alexandra Palace.
The Jester from Leicester surrendered leads of 4-0 and 5-2, and was pegged back to 5-5 before he eventually prevailed with his ninth deciding-frame victory in the competition - maintaining his perfect record.
The three-time winner of this event was cruising come the mid-session interval, after winning the first four frames.
However, Davis fought back gallantly after going 5-2 behind, with an 80 and a magnificent 136 clearance to keep the match alive.
The world number 14 won the next two frames with runs of 62 and 61 along the way, to set up a decider with his opponent looking rattled.
But after being in this situation eight times before, since making his debut in the tournament in 2008, Selby was always going to feel the more comfortable, despite the loss of form, and he held his nerve to go through.
He will now play the winner of either Stuart Bingham or John Higgins in the last eight on Thursday night.