2018 Shimadzu All Japan Indoor Tennis Championships – Doubles
# 2018 Shimadzu All Japan Indoor Tennis Championships – Doubles

Sanchai and Sonchat Ratiwatana were the defending champions but lost in the first round to Gong Maoxin and Hsieh Cheng-peng.

Luke Saville and Jordan Thompson won the title after defeating Go Soeda and Yasutaka Uchiyama 6–3, 5–7, [10–6] in the final.

## Seeds

* Sanchai Ratiwatana / Sonchat Ratiwatana (first round)
* Jeevan Nedunchezhiyan / Christopher Rungkat (first round)
* Luke Saville / Jordan Thompson (champions)
* Peng Hsien-yin / Andreas Siljeström (first round)

## Draw

### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

| First round | First round | First round | First round | First round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 1 | Sa Ratiwatana So Ratiwatana | $6^6$ | 4 | | | | | | | | | | | | | | | | |
| | M Gong C-p Hsieh | $7^8$ | 6 | | | M Gong C-p Hsieh | $6^3$ | 6 | [10] | | | | | | | | | | |
| | T Kamke T Pütz | 6 | 2 | [10] | | T Kamke T Pütz | $7^7$ | 2 | [3] | | | | | | | | | | |
| | M Purcell A Whittington | 4 | 6 | [6] | | | | | | | M Gong C-p Hsieh | $7^8$ | $6^8$ | [3] | | | | | |
| 3 | L Saville J Thompson | $7^7$ | 6 | | | | | | | 3 | L Saville J Thompson | $6^6$ | $7^{10}$ | [10] | | | | | |
| WC | T Ito K Uesugi | $6^3$ | 3 | | 3 | L Saville J Thompson | $7^7$ | 7 | | | | | | | | | | | |
| | T Matsui C-h Yi | $7^7$ | 4 | [11] | | B Klein L Margaroli | $6^1$ | 5 | | | | | | | | | | | |
| | B Klein L Margaroli | $6^5$ | 6 | [13] | | | | | | | | | | | 3 | L Saville J Thompson | 6 | 5 | [10] |
| | T Altuna H Hurkacz | 6 | 2 | [10] | | | | | | | | | | | | G Soeda Y Uchiyama | 3 | 7 | [6] |
| WC | Sora Fukuda Y Shimizu | 1 | 6 | [8] | | T Altuna H Hurkacz | 2 | 1 | | | | | | | | | | | |
| | G Soeda Y Uchiyama | 6 | 6 | | | G Soeda Y Uchiyama | 6 | 6 | | | | | | | | | | | |
| 4 | H-y Peng A Siljeström | 4 | 4 | | | | | | | | G Soeda Y Uchiyama | 6 | $7^8$ | | | | | | |
| WC | Daiki Hayashi Kosuke Shibano | 5 | 1 | | | | | | | | S Balaji P Gunneswaran | 4 | $6^6$ | | | | | | |
| | S Balaji P Gunneswaran | 7 | 6 | | | S Balaji P Gunneswaran | 6 | 6 | | | | | | | | | | | |
| | Z Li S Robert | 6 | 6 | | | Z Li S Robert | 4 | 4 | | | | | | | | | | | |
| 2 | J Nedunchezhiyan C Rungkat | 3 | 1 | | | | | | | | | | | | | | | | |
