Robertson dominated the two-time world champion

Robertson will now take on Stephen Maguire, who held off a fightback from reigning champion John Higgins.

Higgins came from 5-3 down to level at 5-5 but missed when well placed and Maguire completed a 6-5 victory.

Ken Doherty won five straight frames from 2-0 down as he beat Barry Hawkins 6-3 in Monday's final match.

Robertson, 24, made one century break and four more half centuries to complete the rout.

"That was probably the best I've ever played," said Robertson.

"But my preparation for the match was bad. At 10.45 I was running to the venue in my (playing) shoes."

I didn't miss any easy balls, my long-potting was great and my safety was good Neil Robertson

Robertson, the provisional world number 11, added: "I was up at 0920, which is early for me, but I left a few things behind and had to wait for my friends to bring them to me. I only got eight minutes practice in because I was late."

Despite his lack of preparation, Robertson, the Royal London Watches Grand Prix winner, compiled breaks of 57, 86, 78, 102 and 88 to seal victory.

It was the first time Williams, who won the crown in 1998 and 2003, had ever been whitewashed at the event.

Cambridge-based Robertson added: "I'm so happy with my life right now. I was just really pleased with the way I played.

I was very, very lucky to win that match Stephen Maguire after his 6-5 win over John Higgins

"I didn't miss any easy balls, my long-potting was great and my safety was good.

"I'm also starting to score a lot heavier now - and that's been a weakness of mine in the past. I've not been able to put frames away in one visit.

"But that's something I've been really working on. The break-building aspect of my game has definitely improved."

Maguire led 2-0, 3-1 and 5-3 but was unable to shake Higgins off until the last.

But Higgins missed a straight-forward red into the corner with the rest when well placed, and Maguire took the opportunity to complete his victory.

"I was very, very lucky to win that match," said a relieved Maguire.

"Nine times out of 10 John would have cleared up there.

"It was just an off day for him, but he's not played well and I still managed to scrape over the line."

Higgins was very unhappy with his performance and felt his play did not merit victory.

"I was garbage," he said.

"I was rubbish. I knew Stephen was struggling because he's using a new cue - and you could tell confidence-wise he wasn't his usual self."

Doherty finished his match with an impressive 127 clearance but admitted it had been a tough day at the office.

"It was a bit of a struggle in the beginning - but it was nice to finish the match off with a century break," said Doherty.