| Doubles | |
|---|---|
| 2015 Keio Challenger | |
| Champions |  Sanchai Ratiwatana Sonchat Ratiwatana |
| Runners-up |  Riccardo Ghedin  Yi Chu-huan |
| Final score | 6–4 , 6–4 . |
Sanchai Ratiwatana and Sonchat Ratiwatana won the title , defeating Riccardo Ghedin and Yi Chu-huan in the final 6–4 , 6–4
Sanchai Ratiwatana / Sonchat Ratiwatana (champions) Riccardo Ghedin / Yi Chu-huan (final)
Bai Yan / Li Zhe (semifinals) Chen Ti / 
Franko Škugor (semifinals)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | Sa Ratiwatana So Ratiwatana | 6 | 6 | ||||||||||||||||||||||||
 O Jasika Gavin van Peperzeel | 4 | 1 | 1 | Sa Ratiwatana So Ratiwatana | 6 | 6 | |||||||||||||||||||||
| WC |  T Matsui  C Rungkat | 6 | 3 | [3] | WC |  JP Fruttero K Uesugi | 2 | 4 | |||||||||||||||||||
| WC | JP Fruttero K Uesugi | 4 | 6 | [10] | 1 | Sa Ratiwatana So Ratiwatana | 6 | 3 | [13] | ||||||||||||||||||
| 4 | T Chen F Škugor | 6 | 6 | 4 | T Chen F Škugor | 2 | 6 | [11] | |||||||||||||||||||
J Jung  T Vorster | 4 | 4 | 4 | T Chen F Škugor | 77 | 6 | |||||||||||||||||||||
| H-h Lee Y Uchiyama | 5 | 2 |  K Kravchuk A Kudryavtsev | 62 | 2 | ||||||||||||||||||||||
| K Kravchuk A Kudryavtsev | 7 | 6 | 1 | Sa Ratiwatana So Ratiwatana | 6 | 6 | |||||||||||||||||||||
| J Wang T-h Yang | 6 | 6 | 2 | R Ghedin C-h Yi | 4 | 4 | |||||||||||||||||||||
| B Sato G Soeda | 3 | 2 | J Wang T-h Yang | ||||||||||||||||||||||||
 A Kapaś  D Sharan | 1 | 4 | 3 | Y Bai Z Li | w/o | ||||||||||||||||||||||
| 3 | Y Bai Z Li | 6 | 6 | 3 | Y Bai Z Li | 3 | 2 | ||||||||||||||||||||
| J Cerretani J Thompson | 3 | 2 | 2 | R Ghedin C-h Yi | 6 | 6 | |||||||||||||||||||||
 B Klein M Reid | 6 | 6 | B Klein M Reid | 4 | 3 | ||||||||||||||||||||||
| WC | Nasa Hatakeyama Kaito Itsusaki | 64 | 62 | 2 | R Ghedin C-h Yi | 6 | 6 | ||||||||||||||||||||
| 2 | R Ghedin C-h Yi | 77 | 77 | ||||||||||||||||||||||||
Sanchai Ratiwatana and Sonchat Ratiwatana won the title, defeating Adam Feeney and Samuel Groth 6–4, 2–6, [10–8] in the final.
Karan Rastogi and Divij Sharan were the defending champions but decided not to participate.
Sanchai Ratiwatana and Sonchat Ratiwatana won the title, defeating Gong Maoxin and Zhang Ze 6–4, 6–2 in the final.
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.
Michail Elgin and Alexandre Kudryavtsev were the defending champions, but decided not to compete.
Brydan Klein and Matt Reid won the title, defeating Riccardo Ghedin and Yi Chu-huan in the final 6–2, 7–6.(7–3)
Benjamin Mitchell and Jordan Thompson are the defending champions, but only Mitchell defending his title partnering Matthew Barton.
This was the first edition of the tournament.
Daniel Muñoz de la Nava and Aleksandr Nedovyesov were the defending champions but they decided not to compete this year.
Gero Kretschmer and Alexander Satschko were the defending champions, but did not compete this year.
This was the first edition of the tournament.
Sanchai and Sonchat Ratiwatana were the defending champions but lost in the final to Sam Groth and Leander Paes 4–6, 6–1, [10–7].
This was the first edition of the tournament.
Wu Di and Yi Chu-huan were the defending champions but chose not to compete together. Wu played alongside Zhang Zhizhen. Yi teamed up with Hsieh Cheng-peng. Wu lost in the quarterfinals to Gao Xin and Li Zhe.
Hsieh Cheng-peng and Yang Tsung-hua were the defending champions but chose not to participate together. Hsieh partnered Yi Chu-huan, while Yang partnered Jeevan Nedunchezhiyan. Yang lost in the first round to Wu Tung-lin and Zhang Ze. Hsieh lost in the final to Sanchai and Sonchat Ratiwatana 4–6, 6–7(4–7).
Lee Hsin-han and Denys Molchanov were the defending champions but chose not to defend their title.
Sanchai Ratiwatana and Sonchat Ratiwatana were the defending champions but only Sonchat Ratiwatana defended his title, partnering Yi Chu-huan. Ratiwatana lost in the semifinals to Daniel Masur and Ante Pavić.
Wesley Koolhof and Matwé Middelkoop were the defending champions but chose not to participate.
Gong Maoxin and Yi Chu-huan were the defending champions but chose to defend their title with different partners. Gong partnered Zhang Ze but lost in the quarterfinals to Ruben Gonzales and Hsieh Cheng-peng. Yi partnered Yuya Kibi but withdrew from the tournament due to a Kibi injury.
Sanchai and Sonchat Ratiwatana were the defending champions but only Sanchai Ratiwatana chose to defend his title, partnering Peng Hsien-yin. Ratiwatana lost in the first round to Masahiro Fukuda and Masamichi Imamura.
Hsieh Cheng-peng and Peng Hsien-yin were the defending champions but chose to defend their title with different partners. Hsieh partnered Yang Tsung-hua and successfully defended his title. Peng partnered Yi Chu-huan but lost in the first round to Benjamin Lock and Rubin Statham.