2017 Swiss Indoors – Singles

Roger Federer defeated Juan Martín del Potro in the final, 6–7(5–7), 6–4, 6–3 to win the singles tennis title at the 2017 Swiss Indoors. It was his eighth Swiss Indoors and 95th singles title, surpassing Ivan Lendl for second place in the list for most men's singles titles won in the Open era.

Marin Čilić was the defending champion, but lost in the semifinals to del Potro.

Seeds
• # Roger Federer (champion)

• # Marin Čilić (semifinals)

• #🇧🇪 David Goffin (semifinals)

• #🇦🇷 Juan Martín del Potro (final)

• #🇺🇸 Jack Sock (quarterfinals)

• #🇪🇸 Roberto Bautista Agut (quarterfinals)

• #🇫🇷 Adrian Mannarino (quarterfinals)

• #🇩🇪 Mischa Zverev (first round)

Seeds
• # 🇺🇿 Denis Istomin (first round)

• # 🇩🇪 Florian Mayer (qualifying competition, lucky loser)

• # 🇩🇪 Peter Gojowczyk (qualified)

• # 🇰🇿 Mikhail Kukushkin (qualified)

• # 🇫🇷 Julien Benneteau (qualified)

• # 🇭🇺 Márton Fucsovics (qualified)

• # 🇨🇦 Vasek Pospisil (qualifying competition, lucky loser)

• # 🇫🇷 Nicolas Mahut (qualifying competition)

Qualifiers
• # 🇫🇷 Julien Benneteau

• # 🇭🇺 Márton Fucsovics

• # 🇩🇪 Peter Gojowczyk

• # 🇰🇿 Mikhail Kukushkin

Lucky losers
• # 🇨🇦 Vasek Pospisil

• # 🇩🇪 Florian Mayer