2017 Garanti Koza Sofia Open – Singles

Roberto Bautista Agut was the defending champion, but lost in the semifinals to David Goffin.

Grigor Dimitrov won the title, defeating Goffin in the final, 7–5, 6–4.

Seeds
The top four seeds receive a bye into the second round. • # 🇦🇹 Dominic Thiem (second round)

• # 🇧🇪 David Goffin (final)

• # 🇧🇬 Grigor Dimitrov (champion)

• # 🇪🇸 Roberto Bautista Agut (semifinals)

• # 🇱🇺 Gilles Müller (quarterfinals)

• # 🇩🇪 Philipp Kohlschreiber (withdrew)

• # 🇨🇾 Marcos Baghdatis (withdrew)

• # 🇸🇰 Martin Kližan (quarterfinals)

• # 🇷🇸 Viktor Troicki (quarterfinals)

Seeds
• # 🇷🇺 Teymuraz Gabashvili (qualifying competition, lucky loser)

• # 🇨🇦 Steven Diez (first round)

• # 🇩🇪 Maximilian Marterer (qualified)

• # 🇫🇷 Mathias Bourgue (qualified)

• # 🇯🇵 Hiroki Moriya (first round)

• # Stefanos Tsitsipas (first round)

• # 🇷🇸 Marko Tepavac (qualifying competition, lucky loser)

• # 🇩🇪 Daniel Brands (qualified)

Qualifiers
• # 🇩🇪 Daniel Brands

• # 🇩🇪 Cedrik-Marcel Stebe

• # 🇩🇪 Maximilian Marterer

• # 🇫🇷 Mathias Bourgue

Lucky losers
• # 🇷🇺 Teymuraz Gabashvili

• # 🇷🇸 Marko Tepavac