2013 Keio Challenger – Singles

Matteo Viola was the defending champion but chose not to compete. Matthew Ebden won his third Challenger of the year over Japan's Go Soeda.

Seeds
• # 🇦🇺 Matthew Ebden (champion)

• # Blaž Kavčič (second round, withdrew)

• # 🇯🇵 Go Soeda (final)

• # 🇺🇸 Bradley Klahn (semifinals)

• # 🇦🇺 James Duckworth (first round)

• # 🇫🇷 Pierre-Hugues Herbert (semifinals)

• # 🇯🇵 Yūichi Sugita (first round, retired)

• # 🇯🇵 Tatsuma Ito (quarterfinals)