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Novak Djokovic described his performance as "flawless" after easing into the quarter-finals of the Madrid Open with a straight-sets win over Roberto Bautista Agut.
The world number one took just 68 minutes to beat his 15th seeded opponent 6-2 6-1 and move a step closer to capturing his fifth title of 2016.
Djokovic said: "It was a flawless performance after 2-2. Everything worked very well. I didn't give him too much time. I'm very, very pleased with the performance."
Next up for Djokovic is a meeting with 11th seed Milos Raonic, who was a powerful 6-4 6-4 winner over Jo-Wilfried Tsonga on Thursday.
But to win the title Djokovic is likely to have to dethrone reigning champion and world number two Andy Murray, who also reached the last eight with a 6-4 6-2 win over Gilles Simon.
Murray broke the Frenchman in the crucial 10th game of the first set then broke again in the second game of the second set to move closer to victory.
Murray said on Sky Sports afterwards: "It was good. At the beginning of the match I didn't return that well, but after that I started to get some rhythm on my return and I was able to dictate a lot of points."
Murray will next face eighth seed Tomas Berdych after the powerful Czech beat Spain's David Ferrer over two tight sets 7-6 (8) 7-5.
Rafael Nadal's recent revival continued, a straight-forward 6-4 6-2 win over Sam Querrey setting up a quarter-final meeting with Joao Sousa, who beat American Jack Sock 6-1 6-7 (3) 6-2.
In the other quarter-final, Nick Kyrgios will play Kei Nishikori after they recorded wins over Pablo Cuevas and Richard Gasquet respectively.
In the women's quarter-finals, the only remaining seed, Simona Halep, survived a topsy-turvy battle with Romanian compatriot Irina-Camelia Begu to move through 6-3 0-6 6-1.
Next up for Halep is Australian Sam Stosur, who ended the run of Romanian qualifier Patricia Maria Tig with a 6-3 6-4 win in just over one and a half hours.
Dominika Cibulkova came from behind to beat wild card Sorana Cirstea 4-6 6-3 6-3, and she will play qualifier Louisa Chirico - a 7-6 (1) 6-2 winner over Daria Gavrilova - in the last four.