2017 Croatia Open Umag – Singles

Fabio Fognini was the defending champion, but lost in the quarterfinals to lucky loser Andrey Rublev.

Rublev went on to win his first ATP World Tour title, defeating Paolo Lorenzi in the final, 6–4, 6–2. He was the seventh lucky loser in ATP history to win a tour-level title and the first to do so since Rajeev Ram at 2009 Newport.

Seeds
The top four seeds receive a bye into the second round. • #🇧🇪 David Goffin (quarterfinals)

• #🇫🇷 Gaël Monfils (second round)

• #🇮🇹 Fabio Fognini (quarterfinals)

• #🇮🇹 Paolo Lorenzi (final)

• #🇫🇷 Gilles Simon (first round)

• # Borna Ćorić (withdrew)

• #🇫🇷 Benoît Paire (first round)

• #🇨🇿 Jiří Veselý (quarterfinals)

Seeds
• # 🇷🇺 Andrey Rublev (qualifying competition, Lucky loser)

• # 🇫🇷 Kenny de Schepper (qualified)

• # 🇦🇷 Marco Trungelliti (qualified)

• # 🇮🇹 Stefano Napolitano (qualifying competition)

• # 🇭🇺 Attila Balázs (qualified)

• # 🇷🇸 Miljan Zekić (qualified)

• # Franko Škugor (qualifying competition)

• # 🇮🇹 Matteo Donati (qualifying competition)

Qualifiers
• # 🇭🇺 Attila Balázs

• # 🇫🇷 Kenny de Schepper

• # 🇦🇷 Marco Trungelliti

• # 🇷🇸 Miljan Zekić

Lucky losers
• # 🇷🇺 Andrey Rublev