China Open results/draw

The seven-times world champion eased into the semi-finals in Beijing despite injuring himself during a workout at the tournament hotel's gymnasium.

"All I did was go on the rowing machine and stuff like that," said Hendry, who will now face fellow Scot Alan McManus.

"I woke up on Friday feeling very sore and thought I might be in trouble but I took pain-killers. They helped a lot."

Walden booked his debut in the quarter-final of a world-ranking event when Steve Davis, trailing 3-0, was forced to concede their third-round match.

The former world champion felt dizzy after cracking his head on a door-frame prior to the contest. Against Hendry, Walden, the world number 78, was not so fortunate.

He did not pot a ball in three of the opening four frames as Hendry, chasing his 11th ranking title outside Britain, quickly established a 4-0 lead helped by breaks of 83, 77 and 95.

Paul is the first top-eight player I've beaten in a long time Ken Doherty

The fifth frame, a marathon of 35 minutes, was tighter but Hendry eventually put together a clearance of the last five colours, including a difficult black down the side cushion using the rest, to complete the trouncing.

Home favourite Ding Jun Hui delighted the local support with an impressive 5-2 win over Marco Fu.

Ding, who was celebrating his 18th birthday, made the score 1-1 on the black after Fu had left it in the jaws.

Then he pulled away to lead 3-1 before firing a 71 clearance in the final frame to earn a standing ovation from the crowd.

Ding will now meet Ken Doherty, who reached the semi-finals with a 5-1 destruction of Paul Hunter.

Hunter potted only one ball in the last four frames and did not score a point in the last three as Doherty racked up 331 points without reply.

The way I played was embarrassing -form-wise I seem to go three steps forward, then four steps back Mark Williams

"I'm delighted to win because Paul is the first top-eight player I've beaten in a long time," said Doherty. "It's a sign that my form is coming back slowly."

Earlier McManus lined up his final-four date with Hendry with a comfortable 5-2 win over Mark Williams.

McManus got the better of a series of scrappy frames to lead 4-2 before wrapping up victory with a run of 52.

Williams, who has now gone 18 months without a trophy win, was troubled by a headache but refused to blame illness for the loss.

"There's no excuse for how badly I played. The headache wasn't the reason - I wish I knew what it was," he said.

"The way I played was embarrassing. Form-wise I seem to go three steps forward, then four steps back. I can't seem to sustain any form for a long period of time.

"It was exactly the same at the Irish Masters. I started off well then played terribly against Ronnie O'Sullivan in the semi-finals.