2021 Monterrey Open

The 2021 Monterrey Open (also known as the Abierto GNP Seguros for sponsorship reasons) was a women's tennis tournament played on outdoor hard courts. It was the 13th edition of the Monterrey Open and a WTA 250 tournament on the 2021 WTA Tour. It took place at the Club Sonoma in Monterrey, Mexico, from 15 to 21 March 2021.

Singles

 * 🇨🇦 Leylah Annie Fernandez def. Viktorija Golubic, 6–1, 6–4.

This was Fernandez's first WTA tour title.

Doubles

 * 🇺🇸 Caroline Dolehide / 🇺🇸 Asia Muhammad def. 🇬🇧 Heather Watson / 🇨🇳 Saisai Zheng 6–2, 6–3.

Prize money

 * per team

Seeds

 * 1 Rankings as of 8 March 2021.

Other entrants
The following players received wildcards into the main draw:
 * 🇺🇸 Caroline Dolehide
 * 🇺🇸 CoCo Vandeweghe
 * 🇲🇽 Renata Zarazúa

The following player received entry into the singles main draw using a protected ranking:
 * 🇬🇧 Katie Boulter
 * 🇸🇰 Anna Karolína Schmiedlová

The following player received entry as a special exempt:
 * 🇨🇦 Eugenie Bouchard

The following players received entry from the qualifying draw:
 * Viktorija Golubic
 * Kaja Juvan
 * 🇷🇺 Anna Kalinskaya
 * 🇨🇴 Camila Osorio
 * 🇪🇬 Mayar Sherif
 * 🇺🇦 Lesia Tsurenko

The following players received entry as lucky losers:
 * 🇬🇧 Harriet Dart
 * 🇸🇰 Kristína Kučová

Withdrawals

 * Before the tournament
 * 🇧🇾 Victoria Azarenka → replaced by 🇮🇹 Jasmine Paolini
 * 🇨🇿 Marie Bouzková → replaced by 🇸🇰 Kristína Kučová
 * 🇺🇸 Coco Gauff → replaced by 🇷🇺 Varvara Gracheva
 * Polona Hercog → replaced by 🇷🇸 Nina Stojanović
 * 🇹🇳 Ons Jabeur → replaced by 🇸🇰 Anna Karolína Schmiedlová
 * 🇬🇧 Johanna Konta → replaced by Tamara Zidanšek
 * 🇲🇪 Danka Kovinić → replaced by 🇬🇧 Harriet Dart
 * 🇵🇱 Magda Linette → replaced by 🇮🇹 Martina Trevisan
 * 🇦🇺 Ajla Tomljanović → replaced by 🇨🇳 Zhu Lin


 * During the tournament
 * Kaja Juvan (Covid-19 illness)

Seeds

 * Rankings as of March 8, 2021.

Other entrants
The following pairs received wildcards into the doubles main draw:
 * 🇲🇽 Fernanda Contreras / 🇲🇽 Marcela Zacarías
 * 🇨🇴 Camila Osorio / 🇲🇽 Renata Zarazúa

Withdrawals

 * Before the tournament
 * 🇨🇿 Marie Bouzková / 🇪🇸 Sara Sorribes Tormo → replaced by 🇵🇱 Paula Kania-Choduń / 🇵🇱 Katarzyna Piter
 * 🇷🇺 Anna Kalinskaya / 🇸🇰 Viktória Kužmová → replaced by 🇧🇪 Greet Minnen / 🇺🇸 Ingrid Neel
 * During the tournament
 * 🇷🇺 Anna Blinkova / 🇦🇷 Nadia Podoroska (right hip injury)

Retirements

 * 🇧🇪 Greet Minnen / 🇺🇸 Ingrid Neel (gastrointestinal illness)