2012 Swiss Indoors – Singles

Roger Federer was the defending champion, but lost to Juan Martín del Potro 6–4, 6–7(5–7), 7–6(7–3) in the final.

Seeds
• # Roger Federer (final)

• # 🇦🇷 Juan Martín del Potro (champion)

• # 🇫🇷 Richard Gasquet (semifinals)

• # Stanislas Wawrinka (first round)

• # 🇮🇹 Andreas Seppi (first round)

• # 🇷🇺 Mikhail Youzhny (quarterfinals)

• # 🇩🇪 Florian Mayer (first round)

• # 🇷🇸 Viktor Troicki (first round)

Seeds
• # 🇨🇿 Radek Štěpánek (qualified)

• # 🇷🇴 Victor Hănescu (qualifying competition, retired because of a stomach problem, lucky loser)

• # 🇵🇱 Łukasz Kubot (qualified)

• # 🇩🇪 Tobias Kamke (qualifying competition)

• # 🇷🇺 Andrey Kuznetsov (qualified)

• # 🇧🇪 Steve Darcis (first round)

• # 🇩🇪 Benjamin Becker (qualified)

• # 🇩🇪 Björn Phau (qualifying competition)

Qualifiers
• # 🇨🇿 Radek Štěpánek

• # 🇷🇺 Andrey Kuznetsov

• # 🇵🇱 Łukasz Kubot

• # 🇩🇪 Benjamin Becker

Lucky losers

 * 1) 🇷🇴 Victor Hănescu