2013 SAP Open – Singles

Milos Raonic was the two-time defending champion and won the title for the third year in a row, defeating Tommy Haas in the final 6–4, 6–3.

Seeds
• # 🇨🇦 Milos Raonic (champion)

• # 🇺🇸 John Isner (semifinals)

• # 🇺🇸 Sam Querrey (semifinals)

• # 🇩🇪 Tommy Haas (final)

• # 🇪🇸 Fernando Verdasco (first round)

• # 🇺🇿 Denis Istomin (quarterfinals)

• # 🇦🇺 Marinko Matosevic (second round)

• # 🇧🇪 Xavier Malisse (quarterfinals)

Seeds
• # 🇺🇸 Tim Smyczek (qualified)

• # 🇷🇺 Alex Bogomolov Jr. (qualifying competition)

• # 🇺🇸 Denis Kudla (qualifying competition)

• # 🇺🇦 Illya Marchenko (qualifying competition)

• # 🇺🇸 Ryan Sweeting (qualified)

• # Jimmy Wang (first round)

• # 🇺🇸 Donald Young (qualified)

• # 🇨🇴 Robert Farah (second round)

Qualifiers
• # 🇺🇸 Tim Smyczek

• # 🇺🇸 Ryan Sweeting

• # 🇺🇸 Donald Young

• # Rik de Voest