2013 ATP Vegeta Croatia Open Umag – Singles

Marin Čilić was the defending champion, but withdrew with a knee injury before the tournament began. Tommy Robredo won the title, defeating Fabio Fognini in the final, 6–0, 6–3.

Seeds
The top four seeds receive a bye into the second round. • # 🇫🇷 Richard Gasquet (second round)

• # 🇮🇹 Andreas Seppi (semifinals)

• # 🇮🇹 Fabio Fognini (final)

• # 🇺🇦 Alexandr Dolgopolov (second round)

• # 🇪🇸 Tommy Robredo (champion)

• # 🇸🇰 Martin Kližan (quarterfinals)

• # 🇩🇪 Florian Mayer (first round)

• # 🇦🇷 Carlos Berlocq (second round)

Seeds
• # 🇷🇸 Dušan Lajović (qualified)

• # 🇦🇷 Diego Sebastián Schwartzman (first round)

• # Blaž Kavčič (qualified)

• # 🇷🇸 Boris Pašanski (qualifying competition)

• # Boy Westerhof (qualified)

• # 🇨🇿 Jaroslav Pospíšil (second round)

• # 🇷🇸 Miljan Zekić (first round)

• # 🇸🇰 Pavol Červenák (second round)

Qualifiers
• # 🇷🇸 Dušan Lajović

• # Joško Topić

• # Blaž Kavčič

• # Boy Westerhof