Peter Ebdon made the most of an unlucky foul shot by Quinten Hann to come from behind and claim a 6-3 victory.
Ebdon will face Jimmy White in the quarter-finals
Hann responded to Ebdon's first frame century by taking the next two and was on course for 3-1 until he potted the white, screwing back off the pink.
This let in Ebdon to make a break of 55 and take the frame for 2-2.
It proved to be the pivotal moment in the match, as Ebdon turned the screw.
Hann managed one more frame but Ebdon was not to be denied his triumph.
Peter Ebdon will meet Jimmy White in the quarter-finals and said he was looking forward to a repeat of last year's epic encounter.
"Last year I didn't play particularly well despite being 5-1 ahead, and because I didn't finish Jimmy off, I got what I deserved," he said.
"Quentin started off playing well and he's somebody you have to take very seriously. This is a good win for me.
"He'll have gone into that thinking he could beat me as he could beat me."
Quinten Hann was upbeat despite his defeat Ebdon but knew what the result was down to - his stomach.
"After the interval I was still playing well but I was really hungry and my concentration started to go," he said.
"I eat like a pig. If I go four hours without eating, I get shaky and my concentration drops. This wasn't the first time it's happened.
"I enjoy playing Peter but the game did drag on. I got some chocolate at the end but it was too little too late."