2012 International German Open – Singles

Gilles Simon was the defending champion, but lost in the second round to Tommy Haas. Haas went to the final, but lost to Juan Mónaco 5–7, 4–6.

Seeds
• # 🇪🇸 Nicolás Almagro (semifinals)

• # 🇫🇷 Gilles Simon (second round)

• # 🇦🇷 Juan Mónaco (champion)

• # Marin Čilić (semifinals)

• # 🇪🇸 Fernando Verdasco (first round)

• # 🇩🇪 Philipp Kohlschreiber (quarterfinals)

• # 🇩🇪 Florian Mayer (quarterfinals)

• # 🇷🇸 Viktor Troicki (first round)

Seeds
• # 🇧🇷 Rogério Dutra da Silva (qualifying competition)

• # 🇦🇷 Horacio Zeballos (qualified)

• # 🇦🇷 Federico Delbonis (qualified)

• # Frederico Gil (first round)

• # 🇪🇸 Daniel Muñoz de la Nava (qualified)

• # 🇦🇷 Eduardo Schwank (first round)

• # 🇮🇹 Alessandro Giannessi (first round)

• # 🇷🇺 Teymuraz Gabashvili (first round)

Qualifiers
• # 🇪🇸 Daniel Muñoz de la Nava

• # 🇦🇷 Horacio Zeballos

• # 🇦🇷 Federico Delbonis

• # 🇹🇷 Marsel İlhan