2012 Keio Challenger – Singles

Takao Suzuki was the champion in 2009. Matteo Viola won the title by defeating Mirza Bašić 7–6(7–3), 6–3 in the final.

Seeds
• # 🇯🇵 Tatsuma Ito (second round)

• # 🇺🇸 Rajeev Ram (quarterfinals)

• # 🇯🇵 Yuichi Sugita (semifinals)

• # 🇮🇹 Matteo Viola (champion)

• # 🇯🇵 Hiroki Moriya (quarterfinals)

• # Chen Ti (first round)

• # 🇬🇧 Jamie Baker (second round)

• # 🇦🇺 Brydan Klein (first round)