2013 International German Open – Singles

Juan Mónaco was the defending champion but lost to Nicolás Almagro in the quarterfinals. Fabio Fognini defeated qualifier Federico Delbonis 4–6, 7–6(10–8), 6–2 to win his first ATP World Tour 500 event and second career title in as many weeks.

Seeds
All seeds receive a bye into the second round. • # Roger Federer (semifinals)

• # 🇩🇪 Tommy Haas (quarterfinals)

• # 🇪🇸 Nicolás Almagro (semifinals)

• # 🇵🇱 Jerzy Janowicz (third round, retired)

• # 🇦🇷 Juan Mónaco (quarterfinals)

• # 🇮🇹 Andreas Seppi (second round)

• # 🇺🇦 Alexandr Dolgopolov (second round)

• # 🇫🇷 Jérémy Chardy (second round)

• # 🇫🇷 Benoît Paire (third round)

• # 🇪🇸 Tommy Robredo (second round)

• # 🇪🇸 Feliciano López (third round)

• # 🇮🇹 Fabio Fognini (champion)

• # 🇷🇺 Mikhail Youzhny (second round)

• # 🇪🇸 Fernando Verdasco (quarterfinals)

• # Ernests Gulbis (second round)

• # 🇸🇰 Martin Kližan (second round)

Seeds
• # 🇵🇱 Łukasz Kubot (qualified)

• # 🇷🇴 Adrian Ungur (qualifying competition)

• # 🇺🇦 Sergiy Stakhovsky (first round)

• # 🇮🇹 Filippo Volandri (first round)

• # 🇦🇷 Martín Alund (first round)

• # 🇦🇷 Federico Delbonis (qualified)

• # 🇧🇷 João Souza (qualifying competition)

• # 🇨🇿 Jan Hájek (qualified)

• # Blaž Kavčič (qualified)

• # 🇦🇷 Diego Schwartzman (qualified)

• # 🇰🇿 Andrey Golubev (qualified)

• # 🇪🇸 Daniel Muñoz de la Nava (qualifying competition)

Qualifiers
• # 🇵🇱 Łukasz Kubot

• # 🇦🇷 Diego Sebastián Schwartzman

• # 🇰🇿 Andrey Golubev

• # 🇨🇿 Jan Hájek

• # Blaž Kavčič

• # 🇦🇷 Federico Delbonis