# 2018 Kobe Challenger – Singles

Stéphane Robert was the defending champion but chose not to defend his title.
Tatsuma Ito won the title after defeating Yosuke Watanuki 3–6, 7–5, 6–3 in the final.

## Seeds

* Yoshihito Nishioka (semifinals)
* Tatsuma Ito (champion)
* Hiroki Moriya (quarterfinals)
* Go Soeda (quarterfinals)
* Lee Duck-hee (withdrew)
* Yasutaka Uchiyama (semifinals)
* Yosuke Watanuki (final)
* Kwon Soon-woo (quarterfinals)

## 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

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| 1 | Yoshihito Nishioka | 0 | 6 | 5 | | | | | |
| 7 | Yosuke Watanuki | 6 | 4 | 7 | | | | | |
| 7 | Yosuke Watanuki | 6 | 4 | 7 | 7 | Yosuke Watanuki | 6 | 5 | 3 |
| | | | | | 2 | Tatsuma Ito | 3 | 7 | 6 |
| 6 | Yasutaka Uchiyama | 6 | 0 | 4 | 2 | Tatsuma Ito | 3 | 7 | 6 |
| 2 | Tatsuma Ito | 4 | 6 | 6 | | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | Y Nishioka | 7 | 6 | | | | | | | | | | | | | | | | |
| | M Echargui | 5 | 1 | | 1 | Y Nishioka | 6 | 7$^7$ | | | | | | | | | | | |
| Q | A Vukic | 6 | 6 | | Q | A Vukic | 2 | 6$^2$ | | | | | | | | | | | |
| Q | C Sinclair | 1 | 1 | | | | | | | 1 | Y Nishioka | 6 | 3 | 6 | | | | | |
| | A Santillan | 6 | 7$^8$ | | | | | | | 8 | S-w Kwon | 1 | 6 | 4 | | | | | |
| | Makoto Ochi | 3 | 6$^6$ | | | A Santillan | 2 | 7 | 6$^3$ | | | | | | | | | | |
| | Renta Tokuda | 3 | 6 | 1 | 8 | S-w Kwon | 6 | 5 | 7$^7$ | | | | | | | | | | |
| 8 | S-w Kwon | 6 | 1 | 6 | | | | | | | | | | | 1 | Y Nishioka | 0 | 6 | 5 |
| 4 | G Soeda | 6 | 6 | | | | | | | | | | | | 7 | Yo Watanuki | 6 | 4 | 7 |
| WC | K Uesugi | 3 | 1 | | 4 | G Soeda | 6 | 7 | | | | | | | | | | | |
| WC | S Hazawa | 3 | 6 | 3 | Q | A Harris | 3 | 5 | | | | | | | | | | | |
| Q | A Harris | 6 | 3 | 6 | | | | | | 4 | G Soeda | 4 | 4 | | | | | | |
| | G Oliveira | 6 | 6 | | | | | | | 7 | Yo Watanuki | 6 | 6 | | | | | | |
| | E Ruusuvuori | 3 | 4 | | | G Oliveira | 5 | 0 | | | | | | | | | | | |
| | Z Li | 4$^r$ | | | 7 | Yo Watanuki | 7 | 6 | | | | | | | | | | | |
| 7 | Yo Watanuki | 4 | | | | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | Y Uchiyama | 3 | 6 | 6 | | | | | | | | | | | | | | |
| | Shintaro Imai | 6 | 3 | 2 | 6 | Y Uchiyama | 7$^7$ | 6 | | | | | | | | | | |
| Q | T-l Wu | 6 | 6 | | Q | T-l Wu | 6$^0$ | 3 | | | | | | | | | | |
| WC | Hiroyasu Ehara | 3 | 2 | | | | | | | 6 | Y Uchiyama | 6 | 6 | | | | | |
| | J Samper Montaña | 6 | 6 | | | | | | | 3 | H Moriya | 3 | 2 | | | | | |
| WC | Shuichi Sekiguchi | 4 | 1 | | | J Samper Montaña | 6 | 5 | 3 | | | | | | | | | |
| | Kim Cheong-eui | 0 | 6$^0$ | | 3 | H Moriya | 3 | 7 | 6 | | | | | | | | | |
| 3 | H Moriya | 6 | 7$^7$ | | | | | | | | | | | 6 | Y Uchiyama | 6 | 0 | 4 |
| LL | NH Lý | 6$^4$ | 7$^{11}$ | 6 | | | | | | | | | | 2 | T Ito | 4 | 6 | 6 |
| | J-s Nam | 7$^7$ | 6$^9$ | 2 | LL | NH Lý | 4 | 2 | | | | | | | | | | |
| | Y-s Chung | 7$^7$ | 7$^7$ | | | Y-s Chung | 6 | 6 | | | | | | | | | | |
| | J Sels | 6$^3$ | 6$^3$ | | | | | | | | Y-s Chung | 2 | 3 | | | | | |
| | Y Shimizu | 6 | 7 | | | | | | | 2 | T Ito | 6 | 6 | | | | | |
| | Ze Zhang | 1 | 5 | | | Y Shimizu | 6$^6$ | 1 | | | | | | | | | | |
| | D Wu | 4 | 3 | | 2 | T Ito | 7$^8$ | 6 | | | | | | | | | | |
| 2 | T Ito | 6 | 6 | | | | | | | | | | | | | | | |