2016 Swiss Indoors – Singles

Roger Federer, the seven-time winner and defending champion, did not participate due to injury. It would be the first time since 2005 that he would not play in the final in his hometown of Basel. Federer had played in ten consecutive finals from 2006 to 2015.

Marin Čilić won the title, defeating Kei Nishikori in the final, 6–1, 7–6(7–5).

Seeds
• # Stan Wawrinka (quarterfinals)

• #🇨🇦 Milos Raonic (first round)

• #🇯🇵 Kei Nishikori (final)

• # Marin Čilić (champion)

• #🇧🇪 David Goffin (second round)

• #🇧🇬 Grigor Dimitrov (first round)

• #🇫🇷 Richard Gasquet (first round, retired)

• #🇺🇸 Jack Sock (second round)

Seeds
• # Robin Haase (qualified)

• # 🇫🇷 Paul-Henri Mathieu (first round)

• # 🇩🇪 Mischa Zverev (qualified)

• # 🇺🇸 Donald Young (qualified)

• # 🇱🇹 Ričardas Berankis (qualified)

• # Ivan Dodig (first round)

• # 🇺🇸 Ryan Harrison (qualifying competition)

• # 🇺🇸 Rajeev Ram (first round)

Qualifiers
• # Robin Haase

• # 🇱🇹 Ričardas Berankis

• # 🇩🇪 Mischa Zverev

• # 🇺🇸 Donald Young