2017 German Open – Singles

Martin Kližan was the defending champion, but withdrew before the tournament began.

Leonardo Mayer won the title, defeating Florian Mayer in the final, 6–4, 4–6, 6–3.

Seeds
• #🇪🇸 Albert Ramos Viñolas (first round)

• # Pablo Cuevas (first round)

• #🇷🇺 Karen Khachanov (quarterfinals)

• #🇫🇷 Gilles Simon (second round)

• #🇫🇷 Benoît Paire (second round)

• #🇦🇷 Diego Schwartzman (quarterfinals)

• #🇪🇸 Fernando Verdasco (first round)

• #🇪🇸 David Ferrer (second round)

Seeds
• # 🇧🇦 Damir Džumhur (qualified)

• # 🇦🇷 Federico Delbonis (qualified)

• # 🇭🇺 Márton Fucsovics (first round)

• # 🇳🇴 Casper Ruud (first round)

• # 🇺🇦 Sergiy Stakhovsky (qualifying competition)

• # 🇦🇷 Leonardo Mayer (qualifying competition, lucky loser)

• # Gastão Elias (first round, retired)

• # 🇫🇷 Kenny de Schepper (qualifying competition)

Qualifiers
• # 🇧🇦 Damir Džumhur

• # 🇦🇷 Federico Delbonis

• # 🇩🇪 Cedrik-Marcel Stebe

• # 🇩🇪 Rudolf Molleker

Lucky losers
• # 🇦🇷 Leonardo Mayer

• # 🇩🇴 José Hernández-Fernández