Al -Karaz said he had to “stay strong” and “wait for opportunities” against FILS before he can benefit from any mistakes.
“I think his level is currently high and he puts a lot of pressure on his opponents,” Alcaraz said.
“Today I felt it, but at some moments he made some mistakes and tried to make the most of these points.
“I missed Clay. It is good to play Drop Shot, a snapshot that I use a lot and feel comfortable.
Files started an amazing start of the match as it rose 3-0 with two early periods of the opening group.
Alcaraz managed to draw at 4-4, just to break Files again and then hold as a group as he saved two breaks.
FILS disperses seven rest points in Group Two, and Alcaraz pulled the match with a great lop to break Files in the twelfth match.
Alcaraz dropped a service again in the third match of the decision, but she managed to retreat and then got another break in the eighth match of FILS, whose racket broke down clay.
The number 15 FILS failed to recover its composure while Alcaraz kept its calm to seal the match.
The Grand Slam champion four times, offers an offer to win the first master's title since his victory in Indian Wales last year.
Later on Friday, Italian Lorenzo Moutei defeated Greek defense champion Stefanos Tsitsibas 1-6 6-3 6-4 to advance to the ATP Master 1000 semi-finals.
The world saved 16 mustti 14 from the 17th point he reached and will meet with the eighth Australian seed Alex de Minor, who was wearing Gregor Dimitrov 6-0 6-0, in the last eight.
