2011 Rijeka Open – Singles

Blaž Kavčič was the defending champion, but he lost to Paolo Lorenzi 6–4, 1–6, 4–6 in the quarterfinals.

Rui Machado won in the final against Grega Žemlja 6–3, 6–0.

Seeds
• # Blaž Kavčič (quarterfinals)

• # 🇦🇷 Diego Junqueira (second round)

• # Rui Machado (champion)

• # 🇫🇷 Éric Prodon (first round)

• # 🇮🇹 Paolo Lorenzi (semifinals)

• # 🇦🇷 Brian Dabul (first round)

• # 🇫🇷 Vincent Millot (first round)

• # Grega Žemlja (final)