Alcaraz fell twice in the collapse in the first group against De Minor before recovery and a decisive break in the twelfth match.
The 21 -year -old was more dominant in his service in the second group and made the only break in the sixth match.
Alcaraz said: “I started very badly with service, and I was a little mental.”
“The first few games were with my service, then I think I felt a lot. I calmed down myself and started thinking positively again. Alex started strong, playing strongly, and the first group was really narrow.
“I am really happy because I managed to win the first group and in the second I played some great tennis, really happy.”
The runner -up was four times uncomfortable with Off Off against FILS and left for an evaluation outside the court at the end of the second match.
He returned but only managed another five points and retired while 0-2 30-40 down.
Ron No. 13 in the world introduced the defense and second seed champion Rhod twice in each group to secure the victory 6-4 6-2.
Ron the sixth seed will play the role of Karen Khashanov in the semi-finals after beating Alejandro Davidovich Fukyina 6-4.
