2015 PBZ Zagreb Indoors – Singles

Marin Čilić was the two-time defending champion, but withdrew before the tournament started due to an arm injury.

Guillermo García-López won the title, defeating Andreas Seppi in the final, 7–6(7–4), 6–3.

Seeds
Ivo Karlović (second round) 🇫🇷 Adrian Mannarino (second round) 🇪🇸 Guillermo García-López (champion) 🇱🇺 Gilles Müller (second round) 🇮🇹 Andreas Seppi (final) 🇷🇺 Mikhail Youzhny (quarterfinals) 🇷🇸 Viktor Troicki (quarterfinals) 🇪🇸 Marcel Granollers (semifinals)

Seeds
Aljaž Bedene (second round) 🇺🇿 Farrukh Dustov (second round) 🇩🇪 Michael Berrer (qualified) 🇸🇰 Norbert Gombos (qualifying competition) 🇩🇪 Matthias Bachinger (qualified) 🇺🇦 Illya Marchenko (qualified) 🇨🇦 Frank Dancevic (qualified) 🇧🇪 Kimmer Coppejans (first round)

Qualifiers
• # 🇩🇪 Matthias Bachinger

• # 🇺🇦 Illya Marchenko

• # 🇩🇪 Michael Berrer

• # 🇨🇦 Frank Dancevic