| Doubles | |
|---|---|
| 2018 Kobe Challenger | |
| Champions |  Gonçalo Oliveira  Akira Santillan |
| Runners-up |  Li Zhe  Go Soeda |
| Final score | 2–6, 6–4, [12–10] |
Ben McLachlan and Yasutaka Uchiyama were the defending champions but only Uchiyama chose to defend his title, partnering Kaito Uesugi. Uchiyama withdrew before his semifinal match.
Gonçalo Oliveira and Akira Santillan won the title after defeating Li Zhe and Go Soeda 2–6, 6–4, [12–10] in the final.
Gong Maoxin / Zhang Ze (first round) Gonçalo Oliveira / Akira Santillan (champions)
Ivan Sabanov / Matej Sabanov (first round) Yasutaka Uchiyama / Kaito Uesugi (semifinals, withdrew)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | M Gong Ze Zhang | 77 | 4 | [8] | |||||||||||||||||||||||
| Z Li G Soeda | 64 | 6 | [10] | Z Li G Soeda | 6 | 6 | |||||||||||||||||||||
| WC | Shinji Hazawa Y Shimizu | 6 | 6 | WC | S Hazawa Y Shimizu | 3 | 4 | ||||||||||||||||||||
 M Echargui  J Sels | 2 | 3 | Z Li G Soeda | 6 | 4 | [10] | |||||||||||||||||||||
| 3 | I Sabanov M Sabanov | 2 | 6 | [6] | WC | Y Kibi T Niki | 1 | 6 | [7] | ||||||||||||||||||
H Moriya  J Samper Montaña | 6 | 4 | [10] | H Moriya J Samper Montaña | 6 | 2r | |||||||||||||||||||||
| WC | Yuki Mochizuki R Noguchi | 2 | 6 | [9] | WC | Y Kibi T Niki | 2 | 4 | |||||||||||||||||||
| WC | Yuya Kibi T Niki | 6 | 2 | [11] | Z Li G Soeda | 6 | 4 | [10] | |||||||||||||||||||
 J Wang D Wu | 6 | 5 | [8] | 2 | G Oliveira A Santillan | 2 | 6 | [12] | |||||||||||||||||||
| Alt |  Kim Cheong-eui Makoto Ochi | 1 | 7 | [10] | Alt | C-e Kim M Ochi | 1 | 3 | |||||||||||||||||||
| Y Nishioka Yo Watanuki | 65 | 5 | 4 | Y Uchiyama K Uesugi | 6 | 6 | |||||||||||||||||||||
| 4 | Y Uchiyama K Uesugi | 77 | 7 | 4 | Y Uchiyama K Uesugi | ||||||||||||||||||||||
| Shintaro Imai Renta Tokuda | 77 | 6 | 2 | G Oliveira A Santillan | w/o | ||||||||||||||||||||||
X Gao  E Ruusuvuori | 65 | 1 | S Imai R Tokuda | 3 | 4 | ||||||||||||||||||||||
| Y-s Chung S-w Kwon | 4 | 2 | 2 | G Oliveira A Santillan | 6 | 6 | |||||||||||||||||||||
| 2 | G Oliveira A Santillan | 6 | 6 | ||||||||||||||||||||||||
Rémi Boutillier and Maxime Teixeira were the defending champions, but only Teixeira defended his title partnering Maxime Chazal. Teixeira lost in the first round to Alejandro González and Luis David Martínez.
Ričardas Berankis was the defending champion but chose not to defend his title.
Yūichi Sugita was the defending champion but chose not to defend his title.
Hans Podlipnik-Castillo and Andrei Vasilevski were the defending champions but chose not to defend their title.
Gao Xin and Zhang Zhizhen were the defending champions but lost in the quarterfinals to Gong Maoxin and Zhang Ze.
Matthew Ebden was the defending champion but chose not to defend his title.
Kevin Anderson was the defending champion, but withdrew before the tournament began because of a right elbow injury.
Denis Istomin was the defending champion but lost in the third round to Federico Coria.
Andrej Martin was the defending champion and successfully defended his title, defeating Stefano Travaglia 6–4, 6–4 in the final.
Peter Polansky was the defending champion but lost in the semifinals to Yasutaka Uchiyama.
Alexei Popyrin was the defending champion but chose not to defend his title.
Blaž Kavčič was the defending champion but chose not to defend his title.
Jordan Thompson was the defending champion but chose not to defend his title.
Rogério Dutra Silva was the defending champion but chose not to defend his title.
Tatsuma Ito was the defending champion but retired in the second round to Tseng Chun-hsin.
Gonçalo Oliveira and Akira Santillan were the defending champions but chose to defend their title with different partners. Oliveira partnered Brydan Klein but withdrew in the first round. Santillan partnered Bradley Mousley but lost in the first round to Nam Ji-sung and Song Min-kyu.
Ivo Karlović was the defending champion but lost in the third round to Geoffrey Blancaneaux.
Roger Federer was the defending champion, but withdrew from the tournament after undergoing surgery on his right knee.
Jo-Wilfried Tsonga was the defending champion but chose not to defend his title.
Pavel Kotov was the defending champion but chose not to defend his title.