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The world No.3 and No.1 seed at the event was never in trouble against Martinez, who became the 12th straight Spanish player to lose to Alcaraz.

"I played really good tennis today, a really high level. And I have done the right things again," Alcaraz said.

"I was really focused before the match, on my things, on my own tennis. I tried to put everything in today. Being aggressive, pushing him to the limit every point. I think I did the perfect match and I am happy to keep improving every day. Hopefully in the semi-finals I will be even better."

Alcaraz is seeking a first ATP Tour title since winning in Beijing last October.

He will meet Hubert Hurkacz or Andrey Rublev, the champion here in 2021, in his 33rd tour-level semi-final.