Andy Murray cruised into the last eight of the Indian Wells Masters after Tommy Robredo retired with a wrist injury.
The British number one was well on his way to a convincing win at 6-3 3-0 up when Robredo called it a day.
Murray lost his serve early on but hit back by breaking Robredo three times to wrap up the first set and the Spaniard made little impression before retiring.
The Scot faces Croatia's Ivan Ljubicic in the quarter-finals on Thursday, in a match scheduled for around 2000 GMT.
Murray said he felt sorry for Robredo, and also admitted he was not completely happy with his form.
"I'd seen him before the match having ice on his wrist but he was hitting the ball well, serving big and I didn't see him letting up on too many shots. But obviously it was affecting him," said Murray.
The Scot, still finding his way back to form after a recent virus, began sluggishly and was punished by going a break behind in the third game courtesy of some powerful hitting by Robredo.
"I'd like to hit the ball a little bit cleaner from the back and the start of all my matches have been a little bit passive while I've been trying to work my way into a rhythm," he said.
However, he quickly shook of the cobwebs to put himself in control with some controlled returning that placed the onus back on his Spanish opponent.
A better - and fitter - Robredo may have made better use of the opportunities that came his way, but instead he allowed the match to slip away from him with a succession of unforced errors that contributed to Murray winning the next eight games on the bounce.
When Robredo was not acting his own worst enemy, Murray was happy to pile on the misery as he manipulated the world number 15 around the court and, on occasion, offered some scintillatingly subtle volleys.
In the end, Robredo's retirement merely saved him from the ignominy of the impending defeat.
Murray admitted Ljubicic would present a tough challenge, but was still focusing more on the upcoming Miami Masters.
"The conditions are tough, its really hot out here and he plays well around the nets in these conditions," he said.
"I think I've got a chance of winning the tournament but I'm still looking ahead to Miami."
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