2018 Open Castilla y León

The 2018 Open Castilla y León was a professional tennis tournament played on outdoor hard courts. It was the 33rd edition, for men, and 4th edition, for women, of the tournament and part of the 2018 ATP Challenger Tour and the 2018 ITF Women's Circuit. It took place in El Espinar, Segovia, Spain, between 30 July – 5 August 2018.

Seeds

 * 1 Rankings as of 23 July 2018.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇪🇸 Andrés Artuñedo
 * 🇪🇸 Alejandro Davidovich Fokina
 * 🇪🇸 Jorge Hernando Ruano
 * 🇪🇸 Miguel Semmler

The following players received entry from the qualifying draw:
 * 🇫🇷 Yannick Jankovits
 * Lý Hoàng Nam
 * 🇪🇬 Karim-Mohamed Maamoun
 * 🇪🇸 Alberto Romero de Ávila Senise

The following player received entry as a lucky loser:
 * 🇫🇷 Sadio Doumbia

Seeds

 * 1 Rankings as of 23 July 2018.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇪🇸 Ainhoa Atucha Gómez
 * 🇪🇸 Lucía Cortez Llorca
 * 🇪🇸 Ángela Díez Plágaro
 * 🇪🇸 María Gutiérrez Carrasco

The following players received entry by special exempts:
 * 🇪🇸 Cristina Bucșa
 * 🇦🇷 Paula Ormaechea

The following players received entry from the qualifying draw:
 * 🇩🇪 Irina Cantos Siemers
 * 🇪🇸 Alba Carrillo Marín
 * 🇷🇸 Tamara Čurović
 * Mariana Dražić
 * 🇫🇮 Mia Eklund
 * 🇪🇸 Andrea Lázaro García
 * 🇧🇬 Aleksandrina Naydenova
 * 🇪🇸 Olga Parres Azcoitia

Men's singles

 * 🇫🇷 Ugo Humbert def. 🇪🇸 Adrián Menéndez Maceiras 6–3, 6–4.

Women's singles

 * 🇷🇺 Liudmila Samsonova def. 🇹🇷 Başak Eraydın, 6–2, 6–0

Men's doubles

 * 🇪🇸 Andrés Artuñedo / 🇪🇸 David Pérez Sanz def. 🇦🇷 Matías Franco Descotte / João Monteiro 6–7(3–7), 6–3, [10–6].

Women's doubles

 * 🇪🇸 Marina Bassols Ribera / 🇪🇸 Olga Parres Azcoitia def. 🇷🇸 Tamara Čurović / 🇹🇷 Başak Eraydın, 7–5, 6–4