World number one Novak Djokovic racked up his 30th win of a dominant season with a 6-2, 6-1 destruction of Spain's Roberto Bautista Agut to reach the Madrid Masters quarter-finals on Thursday.

Defending champion Andy Murray also sealed his place in the last eight in straight sets with 6-4, 6-2 win over 16th seed Gilles Simon.

Djokovic is playing in Madrid for the first time in three years, but hasn't taken long to adjust to the different conditions in the altitude of the Spanish capital as he has reached the quarters for the lose of just nine games.

The Serb will continue his quest for a fifth title of the season against Milos Raonic or Jo-Wilfried Tsonga on Friday.

Murray extended his impressive record over Simon to 14-2, but wasn't pushed as hard as he often has been in the past by the Frenchman as he didn't even face a break point in just over an hour-and-a-half on court.

The two-time Grand Slam champion will face Thomas Berdych in the last eight after the Czech got the better of David Ferrer 7-6 (10/8), 7-5.

"After the first six or seven games I really started to hit the ball well," said Murray.

"I served well throughout the match. It was a good performance."

Murray pounced on a series of Simon errors to seal the only break of the first set in the final game.