2021 Open Castilla y León

The 2021 Open Castilla y León was a professional tennis tournament played on outdoor hard courts. It was the 35th edition of the tournament and part of the 2021 ATP Challenger Tour. It took place in El Espinar, Segovia, Spain, between 26 July – 1 August 2021.

Seeds

 * 1 Rankings as of 19 July 2021.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇪🇸 Julio César Porras
 * 🇪🇸 Alejandro Moro Cañas
 * 🇪🇸 Nikolás Sánchez Izquierdo

The following players received entry into the singles main draw as alternates:
 * 🇧🇬 Adrian Andreev
 * 🇩🇪 Johannes Härteis
 * 🇷🇴 Filip Jianu

The following players received entry from the qualifying draw:
 * 🇪🇸 Carlos Gimeno Valero
 * 🇺🇸 Nicolas Moreno de Alboran
 * 🇨🇿 Dalibor Svrčina
 * 🇮🇹 Luca Vanni

Singles

 * 🇫🇷 Benjamin Bonzi def. Tim van Rijthoven 7–6(12–10), 3–6, 6–4.

Doubles

 * 🇺🇸 Robert Galloway / 🇺🇸 Alex Lawson def. 🇺🇸 JC Aragone / 🇨🇴 Nicolás Barrientos 7–6(10–8), 6–4.