The Greek tennis player was unable to finish the semifinal match due to injury.
With the score 4: 1 in favor of the 26-year-old native of Chelyabinsk, the judge stopped the meeting.
The game lasted 24 minutes.
Alexandrova in the final of the tournament will meet with Anette Kontaveit from Estonia.
Earlier, the first racket of the world Ashley Barty from Australia announced that she would not take part in the Final Tournament of the Women's Tennis Association (WTA) in Guadalajara.