Spain's Garbiñe Muguruza defended her Monterrey title after an injured Victoria Azarenka retired in the final of the Monterrey Open on Sunday.
Muguruza, who stands 19th in the WTA rankings, lifted the trophy in Monterrey for her first title of the season, when Azarenka's leg injury made it impossible for her to continue after 66 minutes of play.
This is the first time that Muguruza has defended a WTA singles title, as she wins her seventh overall.
The 25-year-old Spanish-Venezuelan claimed the first set with a lopsided scoreline, but Azarenka was well into many of the games. The Belarusian, however, was unable to take her chances and pull back from her early 2-0 deficit.
Azarenka missed multiple service returns as Muguruza clawed back from 0-40 down to hold for 3-1, and Muguruza again saved three break points before holding 5-1.
Azarenka received treatment on her leg during a medical time-out between sets. It became apparent in the second set that her movement was significantly hampered. Despite that, the Belarusian gave her best to continue, saving a break point to hold 1-1.
But the 29-year-old was grimacing and stretching after nearly every point by this juncture, and after Muguruza swiftly broke serve for a 3-1 lead, the two-time Australian Open champion decided to stop play.
Muguruza defeated Timea Babos in 2018 final for her only singles title last year.
Earlier, Muguruza defeated Slovakia's Magdalena Rybarikova 6-2, 6-3 to reach the finals. Ironically, Rybarikova's left knee injury was a major reason in Muguruza's win, similar to what transpired in the finals.