2011 Zagreb Open – Men's singles

Yuri Schukin was the defending champion but chose to compete in Bordeaux instead. Diego Junqueira won this tournament. He defeated João Souza 6–3, 6–4 in the final.

Seeds
• # Ivan Dodig (quarterfinals)

• # 🇮🇳 Somdev Devvarman (first round)

• # 🇩🇪 Denis Gremelmayr (second round)

• # 🇪🇸 Rubén Ramírez Hidalgo (first round)

• # 🇨🇿 Jaroslav Pospíšil (first round)

• # 🇩🇪 Björn Phau (first round)

• # 🇩🇪 Dustin Brown (second round)

• # 🇸🇰 Lukáš Lacko (first round)