2009 International German Open – Singles

Rafael Nadal was the defending champion, but chose not to participate that year.

Nikolay Davydenko won in the final, 6–4, 6–2, against Paul-Henri Mathieu.

Seeds
All seeds receive a bye into the second round. • # 🇫🇷 Gilles Simon (second round)

• # 🇷🇺 Nikolay Davydenko (champion)

• # 🇸🇪 Robin Söderling (third round)

• # 🇪🇸 Tommy Robredo (second round)

• # Stanislas Wawrinka (second round)

• # 🇪🇸 David Ferrer (semifinals)

• # 🇷🇺 Igor Andreev (second round)

• # 🇩🇪 Philipp Kohlschreiber (third round)

• # 🇦🇹 Jürgen Melzer (second round)

• # Viktor Troicki (quarterfinals, retired because of a right foot injury)

• # 🇷🇴 Victor Hănescu (quarterfinals)

• # 🇦🇷 José Acasuso (second round, retired because of a neck injury)

• # 🇫🇷 Paul-Henri Mathieu (final)

• # 🇪🇸 Nicolás Almagro (quarterfinals)

• # 🇫🇷 Jérémy Chardy (third round)

• # 🇩🇪 Mischa Zverev (second round)

Qualifying
The top two seeds received a bye into the qualifying competition

Seeds
• # 🇮🇹 Potito Starace (qualified)

• # 🇷🇴 Victor Crivoi (qualified)

• # 🇪🇸 Daniel Gimeno Traver (qualifying competition)

• # 🇰🇿 Evgeny Korolev (qualified)

• # 🇪🇸 Marcel Granollers (qualified)

• # 🇦🇷 Diego Junqueira (qualifying competition)

• # Pablo Cuevas (qualified)

• # 🇫🇷 Adrian Mannarino (first round)

• # 🇪🇸 Pablo Andújar (first round)

• # 🇪🇸 Pere Riba (qualified)

• # 🇦🇷 Guillermo Cañas (qualifying competition)

• # 🇦🇹 Stefan Koubek (qualifying competition)

Qualifiers
• # 🇮🇹 Potito Starace

• # 🇷🇴 Victor Crivoi

• # Pablo Cuevas

• # 🇰🇿 Evgeny Korolev

• # 🇪🇸 Marcel Granollers

• # 🇪🇸 Pere Riba