2025 Open Castilla y León

The 2025 Open Castilla y León was a professional tennis tournament played on outdoor hard courts. It was the 39th edition of the tournament and part of the 2025 ATP Challenger Tour. It took place in El Espinar, Segovia, Spain, between 21 and 27 July 2025.

Singles main draw entrants

¹ Rankings as of 14 July 2025.

The following players received wildcards into the singles main draw:

The following player received entry into the singles main draw through the Next Gen Accelerator programme:

The following player received entry into the singles main draw as an alternate:

The following players received entry from the qualifying draw:

George Loffhagen def. Nicolás Álvarez Varona 7–6, 6–7, 6–4.

Matías Soto / Federico Zeballos def. Arthur Reymond / Luca Sanchez 3–6, 7–6, .