2012 Keio Challenger

The 2012 Keio Challenger was a professional tennis tournament played on hard courts. It was the eighth edition of the tournament which was part of the 2012 ATP Challenger Tour. It took place in Yokohama, Japan between 12 and 18 November 2012.

Seeds

 * 1 Rankings are as of November 5, 2012.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇯🇵 Toshihide Matsui
 * 🇯🇵 Yoshihito Nishioka
 * 🇯🇵 Masato Shiga
 * 🇯🇵 Kaichi Uchida

The following players received entry from the qualifying draw:
 * 🇯🇵 Yuichi Ito
 * 🇯🇵 Yuuya Kibi
 * 🇯🇵 Shuichi Sekiguchi
 * 🇳🇿 Michael Venus

Singles

 * 🇮🇹 Matteo Viola def. 🇧🇦 Mirza Bašić, 7–6(7–3), 6–3

Doubles

 * 🇮🇳 Prakash Amritraj / 🇦🇹 Philipp Oswald def. 🇹🇭 Sanchai Ratiwatana / 🇹🇭 Sonchat Ratiwatana, 6–3, 6–4