Qualifier Alan McManus beat four-time champion John Higgins 13-11 to achieve the World Championship semi-finals interestingly since 1993.
McManus, 45, trailed 5-3, 7-5, 9-7 and 10-8, yet played with tranquility and familiarity with the end stages.
The world number 29 scored four half-hundreds of years and a 128 to win five of the last six casings and will confront kindred qualifier Ding Junhui in the last four.
Marco Fu held off a splendid Barry Hawkins rebound to win 13-11.
Hong Kong’s Fu will confront world number one Mark Selby, with both semi-finals beginning on Thursday. McManus said his first positioning semi-last appearance since 2006 was not as large a stun to him as it was by all accounts to other people.
“I can and I can’t trust this is going on,” he said.
“You folks continue calling me a veteran and I’m considering ‘offer me a reprieve’. At 45, I figure I’m getting on a tiny bit.
“I’ve never thought these kind of days were totally gone in light of the fact that I can play I’m still truly devoted to the game.
“I cherish the amusement, and I adore playing and I adore playing in huge stadiums.”
Higgins commended his kindred Scot, saying: “The Crucible brings extraordinary weight and I broke toward the end and Alan didn’t. All credit to him. He’s still a fine player.” A pitifully out-of-structure Hawkins trailed 7-1 overnight and slipped 9-1 behind in Wednesday’s morning session.
However, world number 11 Hawkins all of a sudden found the touch that had seen him beat Ronnie’ O’Sullivan in the second round to win eight out of nine casings and trail 10-9.
Fu won the following two to near inside one casing of triumph and finished off the win with a nerveless 74, in spite of at last seeing off another fearless Hawkins fightback.
“That must be the best freedom of my life,” said an assuaged Fu. “I was under a considerable measure of weight toward the end and I couldn’t generally pot the last ball.
“A percentage of the shots I played were repulsive – and I was picking all the wrong shots. Under weight, you can think somewhat senseless.
“I am certain I will appalled when I glance back at a percentage of the shots. I just about discarded it, however fortunately I made a decent break toward the end.”