2017 Open Castilla y León – Men's singles

Luca Vanni was the defending champion but lost in the first round to Gerard Granollers.

Jaume Munar won the title after defeating Alex De Minaur 6–3, 6–4 in the final.

Seeds
• # 🇪🇸 Marcel Granollers (quarterfinals)

• # 🇩🇪 Peter Gojowczyk (first round)

• # 🇺🇦 Sergiy Stakhovsky (first round)

• # 🇮🇹 Luca Vanni (first round)

• # 🇧🇾 Egor Gerasimov (first round)

• # 🇪🇸 Adrián Menéndez-Maceiras (first round)

• # 🇮🇹 Matteo Berrettini (semifinals)

• # 🇧🇾 Ilya Ivashka (first round)