| Date: | 2–8 April |
| Edition: | 10th |
| Category: | WTA International tournaments |
| Draw: | 32S / 16D |
| Surface: | Hard |
| Prize Money: | $250,000 |
| Location: | Monterrey, Mexico |
| Champs: |  Garbiñe Muguruza |
| Champd: |  Naomi Broady / Sara Sorribes Tormo |
The 2018 Monterrey Open (also known as the 2018 Abierto GNP Seguros for sponsorship reasons) was a women's tennis tournament played on outdoor hard courts. It was the 10th edition of the Monterrey Open and an International tournament on the 2018 WTA Tour. It took place at the Club Sonoma in Monterrey, Mexico, from 2 to 8 April 2018.
| Event | W | F | SF | QF | Round of 16 | Round of 32 | width=85 | Q | width=85 | Q3 | width=85 | Q2 | width=85 | Q1 |
| Singles | 280 | 180 | 110 | 60 | 30 | 1 | 18 | 14 | 10 | 1 | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubles | 1 |
| Event | W | F | SF | QF | Round of 16 | Round of 32 | width=85 | Q3 | width=85 | Q2 | width=85 | Q1 |
| Singles | $43,000[1] | $21,400 | $11,300 | $5,900 | $3,310 | $1,925 | $1,005[2] | $730 | $530 | |||
| Doubles* | $12,300[3] | $6,400 | $3,435 | $1,820 | $960 |
| Country | Player | Ranking1 | Seed | |
|---|---|---|---|---|
| Spain | Garbiñe Muguruza | 3 | 1 | |
 Slovakia | Magdaléna Rybáriková | 18 | 2 | |
 Ukraine | Lesia Tsurenko | 41 | 3 | |
 Hungary | Tímea Babos | 47 | 4 | |
| Monica Puig | 82 | 5 | ||
 Romania | Ana Bogdan | 85 | 6 | |
 United States | Sachia Vickery | 89 | 7 | |
 Australia | Ajla Tomljanović | 90 | 8 |
The following players received wildcards into the main draw:
The following players received entry from the qualifying draw:
Risa Ozaki Monica Niculescu → replaced by Irina Falconi
Anastasia Pavlyuchenkova → replaced by 
Carol Zhao| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| Japan | Nao Hibino | Darija Jurak | 107 | 1 | ||
 Argentina | María Irigoyen | Japan | Miyu Kato | 124 | 2 | |
| Dalila Jakupović | Russian Federation | Irina Khromacheva | 130 | 3 | ||
| Russian Federation | Anna Blinkova |  Belarus | Lidziya Marozava | 178 | 4 |
The following pairs received wildcards into the doubles main draw:
See main article: article and 2018 Monterrey Open – Singles.
Garbiñe Muguruza def. Tímea Babos, 3–6, 6–4, 6–3See main article: article and 2018 Monterrey Open – Doubles.
Naomi Broady / Sara Sorribes Tormo def. Desirae Krawczyk / 
Giuliana Olmos, 3–6, 6–4, [10–8]
