2021 Poznań Open – Singles

Tommy Robredo was the defending champion but chose not to defend his title.

Bernabé Zapata Miralles won the title after defeating Jiří Lehečka 6–3, 6–2 in the final.

Seeds
• # 🇪🇸 Bernabé Zapata Miralles (champion)

• # Botic van de Zandschulp (quarterfinals)

• # Henri Laaksonen (withdrew)

• # 🇫🇷 Hugo Gaston (withdrew)

• # 🇨🇿 Zdeněk Kolář (quarterfinals)

• # 🇫🇷 Enzo Couacaud (first round)

• # 🇰🇿 Dmitry Popko (semifinals)

• # 🇦🇷 Guido Andreozzi (first round)