Monterrey Open’s title is defended by Spain’s Garbine Muguruza, 25 after Victoria Azarenka was forced to retire due to a leg injury.
Azarenka, playing her first singles final in three years, required a medical timeout after losing the first set to have strapping applied to her right calf.
The Belarusian, 29, carried on but was clearly restricted before withdrawing when trailing 6-1 3-1.
Muguruza said : “I’m very happy with this week,” “It’s a great feeling to come back and defend a title – it’s never easy.”
Azarenka being tearful said : “It’s unfortunate I couldn’t give my best today, but I tried my hardest”, “I want to say thank you to my son Leo, who is not with me here. I would love him to be here to share this with me because it is special.”