Stuart Bingham edged out Mark Davis 13-10 to reach his first quarter-final at the Betfair World Championship.
The 36-year-old Basildon player is making his seventh appearance at the Crucible and, from a precarious 10-10 at the mid-session interval, he won the next three frames on Monday afternoon to triumph 13-10.
Bingham began his late surge to victory with a break of 111 in the 21st frame, before fending off Davis to set up what will be an all-Essex battle for a semi-final place.
World number eight Bingham said: "It was a tough couple of days and a long old battle. I played well in bits and very poor in other bits.
"I thought it was going to be another second-round defeat but I had the little spurt at the right time at 10-all."
Ronnie O'Sullivan awaits in the last eight after he overcame Ali Carter 13-8.
On the other table, Ding Junhui beat Mark King 13-9 to reach the last-eight stage for the second time in his career.
The former UK and Masters champion trailed 6-2 after the first session but Ding made a superb recovery to lead 9-7 going into Monday afternoon, and held himself together to go through.
King said: "He was on a different planet in the second session and when he's playing like that I don't think anyone can get near him, even Ronnie.
"I was gutted not to win but I enjoyed it."