2021 Zadar Open – Singles

This was the first edition of the tournament.

Nikola Milojević won the title after defeating Dimitar Kuzmanov 2–6, 6–2, 7–6(7–5) in the final.

Seeds
• # 🇮🇹 Gianluca Mager (quarterfinals)

• # 🇮🇳 Sumit Nagal (quarterfinals)

• # 🇷🇸 Nikola Milojević (champion)

• # Blaž Rola (first round)

• # 🇮🇹 Alessandro Giannessi (second round)

• # 🇸🇰 Filip Horanský (first round)

• # 🇫🇷 Enzo Couacaud (first round)

• # 🇮🇹 Gian Marco Moroni (first round)