2012 Gerry Weber Open – Singles

Philipp Kohlschreiber was the defending champion but lost to Tommy Haas in the semifinals.

Haas went on to win the title after defeating five-time champion Roger Federer in the final 7–6(7–5), 6–4.

Seeds
The top four seeds receive a bye into the second round. • # 🇪🇸 Rafael Nadal (quarterfinals)

• # Roger Federer (final)

• # 🇨🇿 Tomáš Berdych (quarterfinals)

• # 🇺🇦 Alexandr Dolgopolov (second round)

• # 🇨🇦 Milos Raonic (quarterfinals)

• # 🇪🇸 Marcel Granollers (second round)

• # 🇮🇹 Andreas Seppi (first round)

• # 🇩🇪 Philipp Kohlschreiber (semifinal)

Seeds
• # Igor Sijsling (second round)

• # Marco Chiudinelli (second round)

• # 🇷🇺 Alexander Kudryavtsev (qualifying competition)

• # 🇧🇪 Maxime Authom (qualifying competition)

• # 🇷🇺 Konstantin Kravchuk (qualified)

• # 🇨🇿 Jan Hernych (qualifying competition)

• # 🇺🇸 Tim Smyczek (qualified)

• # 🇨🇳 Zhang Ze (qualified)

Qualifiers
• # 🇩🇪 Mischa Zverev

• # 🇨🇳 Zhang Ze

• # 🇷🇺 Konstantin Kravchuk

• # 🇺🇸 Tim Smyczek