2021 Lošinj Open – Singles

This was the first edition of the tournament.

Carlos Taberner won the title by walkover after Marco Cecchinato withdrew before the final.

Seeds
• # 🇮🇹 Marco Cecchinato (final, withdrew)

• # 🇪🇸 Carlos Taberner (champion)

• # 🇸🇰 Andrej Martin (second round)

• # 🇷🇸 Nikola Milojević (first round)

• # Blaž Rola (first round)

• # 🇮🇹 Alessandro Giannessi (semifinals)

• # 🇬🇧 Jay Clarke (first round)

• # 🇫🇷 Mathias Bourgue (quarterfinals)