Andy Murray beat Marcel Granollers 6-2 6-0

The score line may have looked one-sided but Britain's Andy Murray was still unhappy after playing two matches in one day in Madrid. He eased into the last-eight at the Spanish event with a confident 6-2 6-0 victory in little over an hour's play over the Spanish wildcard entrant, Marcel Granollers. The Scot remained somewhat dismayed by the scheduling at the tournament though, as his 3am finish against Philipp Kohlschreiber in the previous round clearly still rankled with him.

Murray had few concerns in his latest match, other than with his tired body.

Granollers struggled to get a foothold against an opponent he has had little success against in their past meetings on the tour. The 27-year-old Brit admitted afterwards that he had to 'bluff' his way through the contest. The pretence clearly worked on this occasion.

Despite still feeling weary after his earlier exertions in the day, his 'game face' suggested otherwise on court. Two breaks of serve in the fourth and eighth games of the match proved sufficient for him to secure the first set. It was even more comfortable in the second set as he 'bagelled' his opponent to close out the contest.

There will be little time for resting on his laurels though. His quarter-final opposition should prove a stern test of Murray's abilities, as the fifth-seeded Canadian Milos Raonic will face him later today.

Raonic similarly had few problems in overcoming Leonardo Mayer in straight-sets to reach the last-eight himself. His big serve and all-round game will test the Britain's durability.

Murray was in belligerent mood after his match. His advice to the organisers of the event (and no doubt to the ATP tour in general) was that to ensure top performances "don't play at three o'clock in the morning." The ATP have promised to look into the issue to ensure that the chances of a repeat in the future are minimised.

They have to consider not just the players though in the scheduling, with promoters, broadcasters and the media all to be considered in the decisions made. A tough balancing act indeed, but surely the players' welfare should hold precedence.

Rafael Nadal joined Murray in the last-eight stages after a 6-2 6-2 success over Italy's Simone Bolelli. He also faces a tough challenge in the next round, as the impressive Grigor Dimitrov lies in wait. The Bulgarian surprised many by knocking out Stan Wawrinka in three sets.