| Doubles | |
|---|---|
| 2012 Keio Challenger | |
| Champions | |
| Runners-up | |
| Score | 6–3, 6–4 |
Yang Tsung-hua and Yi Chu-huan won the last edition in 2009.
Prakash Amritraj and Philipp Oswald won the title, defeating Sanchai Ratiwatana and Sonchat Ratiwatana 6–3, 6–4 in the final.
Sanchai Ratiwatana / Sonchat Ratiwatana (final)
Lee Hsin-han / Peng Hsien-yin (quarterfinals)
Purav Raja / Divij Sharan (first round)
Brydan Klein / Dane Propoggia (semifinals)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | 7 | 77 | |||||||||||||||||||||||||
| WC |  Koki Takada Takashi Yano | 5 | 63 | 1 | 6 | 77 | |||||||||||||||||||||
| 5 | 6 | [6] |
| 2 | 60 | ||||||||||||||||||||||
| 7 | 4 | [10] | 1 | 6 | 710 | |||||||||||||||||||||
| 4 | 6 | 77 | 4 | 3 | 68 | ||||||||||||||||||||||
| WC |
| 0 | 65 | 4 | 6 | 6 | |||||||||||||||||||||
| 3 | 2 | 1 | 2 | ||||||||||||||||||||||||
| 6 | 6 | 1 | 3 | 4 | |||||||||||||||||||||||
| 0 | 2 | PR | 6 | 6 | |||||||||||||||||||||||
| PR | 6 | 6 | PR | 5 | 6 | [10] | |||||||||||||||||||||
| 6 | 77 | 7 | 4 | [6] | |||||||||||||||||||||||
| 3 | 3 | 64 | PR | 6 | 6 | ||||||||||||||||||||||
| 6 | 6 |
| 1 | 4 | ||||||||||||||||||||||
| WC | T Matsui Masato Shiga | 4 | 4 |
| 67 | 6 | [10] | ||||||||||||||||||||
| 4 | 4 | 2 | 79 | 4 | [7] | ||||||||||||||||||||||
| 2 | 6 | 6 | |||||||||||||||||||||||||
Rohan Bopanna and Aisam-ul-Haq Qureshi won in the doubles' final of the first edition of these championships. They defeated Thais: Sanchai Ratiwatana and Sonchat Ratiwatana in three sets.
Sanchai Ratiwatana and Sonchat Ratiwatana won in the final 6–3, 7–6(4), against Juan Pablo Brzezicki and Iván Miranda.
Colin Fleming and Ken Skupski were the defending champions; however, they didn't start this year.
Unseeded Frederik Nielsen and Joseph Sirianni won in the final 4–6, 6–4, [10–6], against 1st-seeded Sanchai Ratiwatana and Sonchat Ratiwatana.
Noam Okun and Amir Weintraub were the defending champions, but they didn't start this year.
Carsten Ball and Chris Guccione won the tournament, after defeating Sanchai Ratiwatana and Sonchat Ratiwatana in the final 6–3, 6–2.
Michael Kohlmann and Alexander Peya were the defending champions but decided not to participate.
Scott Lipsky and Rajeev Ram won the title, defeating Sanchai Ratiwatana and Sonchat Ratiwatana 6–7(2), 6–4, [10–4] in the finals.
Number 1 seeds Philipp Marx and Igor Zelenay won 6–4, 7–5 in the final against the No. 2 seeds, twins Sanchai and Sonchat Ratiwatana.
1st seeds Scott Lipsky and David Martin won in the final 5–7, 6–1, [10–8], against Sanchai and Sonchat Ratiwatana.
Dominik Meffert and Simon Stadler were the defending champions but decided not to participate.
Sanchai Ratiwatana and Sonchat Ratiwatana won the title, defeating Hsieh Cheng-peng and Lee Hsin-han 7–6(9–7), 6–3 in the final.
Sanchai Ratiwatana and Sonchat Ratiwatana won the title, defeating Adam Feeney and Samuel Groth 6–4, 2–6, [10–8] in the final.
Olivier Charroin and Martin Fischer were the defending champions, but decided not to participate.
Sanchai Ratiwatana and Sonchat Ratiwatana won the final 7–6(7–5), 6–7(3–7), [10–8] against Purav Raja and Divij Sharan
Marin Draganja and Mate Pavić won the title, defeating Sanchai and Sonchat Ratiwatana in the final, 6–3, 3–6, [10–7].
This was the first edition of the event.
Peng Hsien-yin and Yang Tsung-hua were the defending champions, but decided not to compete.
Sanchai Ratiwatana and Sonchat Ratiwatana were the defending champions, but lost in the first round to Jamie Delgado and Gilles Müller.
Denise Dy and Treat Huey were the defending champions and successfully defended their title, defeating Peangtarn Plipuech and Sonchat Ratiwatana in the final, 7–6, 6–4.
Sanchai Ratiwatana and Sonchat Ratiwatana won the title, defeating Riccardo Ghedin and Yi Chu-huan in the final 6–4, 6–4
This was the first edition of the tournament.
Hsieh Cheng-peng and Yang Tsung-hua were the defending champions but lost in the semifinals to Sanchai and Sonchat Ratiwatana.
Denise Dy and Treat Huey were the defending champions having won the event in 2015, but Huey chose not to participate
Lee Hsin-han and Lu Yen-hsun were the defending champions but chose not to defend their title.
