Shaun Murphy booked his place in the last eight at the Crucible with an awesome display against John Parrott in the last session of their match.
Murphy (right) beat Matthew Stevens to the crown two years ago
The pair were level at 8-8 before Murphy fired in a 131 clearance and then added a 60 to go two frames clear.
A tense safety exchange in the 19th saw Parrott make a mistake on the final brown, allowing Murphy to move 11-8 up.
The 2005 winner won the next, after Parrott wasted an opportunity, before Murphy sealed an impressive victory.
Earlier, the Rotherham resident raced into a 4-0 lead with three breaks over 50 including a ton in the fourth.
I felt as though I'd got a family of ferrets in my waistcoat
Parrott scrapped his way back by taking the next three and scoring his first 50 of the match in the sixth, before Murphy clinched the eighth.
The 1991 winner then produced a fantastic fightback to level with Murphy during the second session.
Parrott hit back with a 40 in the ninth before Murphy re-established his two-frame lead in the 10th.
They shared the next four frames, but Murphy's poor positional play in the 11th allowed the 42-year-old to steal.
And in the final frame of the session, Parrott rolled back the years with a 123 clearance.
Murphy said he had to hit top gear against Parrott after going into the final session level.
"I just decided to go for it and obviously it paid off," said Murphy, who will meet wither Matthew Stevens or Mark Allen in the last eight.
"My mate Richard told me to go back to playing the way I did when I was 11. It worked but every credit to John.
"I knew it would be tough but he really pushed me hard."
Parrott said he felt unusually jittery in the final session.
"It's been a very long time since I've been that nervous. I felt as though I'd got a family of ferrets in my waistcoat," said Parrott.
"Of course I'm disappointed but I got through two qualifying rounds just to be here, then beat Steve so I can't complain. It's been fun."
Shaun Murphy 13-8 John Parrott
65-32 (55) 66-1 (65) 100-0 (100) 108-24 34-84 5-75 (74) 4-83 75-37 23-62 57-23 61-58 25-88 16-91 (68) 80-49 43-73 0-123 (123) 131-0 (131) 95-1 (60) 55-52 65-37 72-14