Hendry edged the final frame with a break of 38

The former world champion trailed 3-1 at one point but battled pack to edge a scrappy final frame.

"I was solid enough but struggled to get the win," said Hendry.

Defending champion Ding Jun Hui compiled the highest break of the tournament so far with a 135 on his way to beating Graeme Dott 5-2.

Wales' Mark Williams and Scotland's John Higgins both posted 5-0 wins to reach the last eight.

Hendry will face Williams, who defeated Scottish qualifier Scott MacKenzie, while Higgins hammered England's Peter Ebdon.

Joe Perry won 5-4 against Michael Holt, who conceded the deciding frame despite only trailing 19-0. Holt had led 4-2 and lost the eighth frame on the black.

I don't feel like I've won. This is the worst I've ever felt after winning a snooker match Joe Perry

England's Stephen Lee beat Thailand's James Wattana 5-4 and Ireland's Ken Doherty beat Ricky Walden 5-2.

It is the second time in as many tournaments that former world champion Ebdon has been whitewashed and the third time this season.

Higgins hit breaks of 40 (twice), 78, 58 and 128, while Ebdon's highest run was 22.

Higgins will now play Cambridgeshire's Perry, who was stunned by Holt's decision to throw the towel in with 11 reds remaining.

"I'm in a state of shock," said the world number 14. "He left me a red from a safety and shook my hand but you couldn't say I was going to win it from there.

"I don't feel like I've won. This is the worst I've ever felt after winning a snooker match. Michael is a really close friend."

Nottingham's Holt, the world number 24, said: "I was completely gone and to carry on would have wasted everyone's time.

"When I look back I'll probably regret it because it was unprofessional, but it was the second match in a row I'd lost from 4-2 up and it was on my mind."

Meanwhile, Williams' victory means his top 16 world ranking now looks secure and he remains on course for a fifth ranking title on Asian soil.

Welsh Open champion Lee, who trailed Wattana 4-1 before fighting back, will play former world champion Doherty.