# 2018 Shimadzu All Japan Indoor Tennis Championships – Singles

Yasutaka Uchiyama was the defending champion but lost in the first round to Michał Przysiężny.
John Millman won the title after defeating Jordan Thompson 7–5, 6–1 in the final.

## Seeds

* John Millman (champion)
* Jordan Thompson (final)
* Go Soeda (quarterfinals)
* Stéphane Robert (first round)
* Tatsuma Ito (second round)
* Kwon Soon-woo (second round)
* Hubert Hurkacz (quarterfinals)
* Yasutaka Uchiyama (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

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | John Millman | 6 | 6 | | | | | |
| Q | Blake Ellis | 3 | 4 | | | | | |
| Q | Blake Ellis | 3 | 4 | | 1 | John Millman | 7 | 6 |
| | | | | | 2 | Jordan Thompson | 5 | 1 |
| | Tim Pütz | 6 | 5 | 4 | 2 | Jordan Thompson | 5 | 1 |
| 2 | Jordan Thompson | 3 | 7 | 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 |
| 1 | J Millman | 6 | 6 | | | | | | | | | | | | | | | |
| | D Wu | 4 | 4 | | 1 | J Millman | 7$^7$ | 6$^6$ | 6 | | | | | | | | | |
| | B Klein | 6 | 3 | 7$^7$ | | B Klein | 6$^3$ | 7$^8$ | 3 | | | | | | | | | |
| | Ze Zhang | 3 | 6 | 6$^5$ | | | | | | 1 | J Millman | 4 | 6 | 6 | | | | |
| | M Purcell | 6 | 6 | | | | | | | 7 | H Hurkacz | 6 | 3 | 2 | | | | |
| | M Banes | 4 | 4 | | | M Purcell | 1 | 4 | | | | | | | | | | |
| Q | Yuya Kibi | 5 | 3 | | 7 | H Hurkacz | 6 | 6 | | | | | | | | | | |
| 7 | H Hurkacz | 7 | 6 | | | | | | | | | | | | 1 | J Millman | 6 | 6 |
| 3 | G Soeda | 7$^8$ | 0 | 7$^7$ | | | | | | | | | | | Q | B Ellis | 3 | 4 |
| WC | Y Watanuki | 6$^6$ | 6 | 6$^2$ | 3 | G Soeda | 6 | 6 | | | | | | | | | | |
| | A Whittington | 6 | 6 | | | A Whittington | 4 | 1 | | | | | | | | | | |
| WC | Sora Fukuda | 3 | 3 | | | | | | | 3 | G Soeda | 3 | 7 | 5 | | | | |
| | Y Takahashi | 7$^7$ | 4 | 4 | | | | | | Q | B Ellis | 6 | 5 | 7 | | | | |
| Q | B Ellis | 6$^4$ | 6 | 6 | Q | B Ellis | 4 | 6 | 6 | | | | | | | | | |
| WC | Y Shimizu | 2 | 3 | | 5 | T Ito | 6 | 3 | 4 | | | | | | | | | |
| 5 | T Ito | 6 | 6 | | | | | | | | | | | | | | | |

### 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 |
| 8 | Y Uchiyama | 6 | 4 | 6$^3$ | | | | | | | | | | | | | | |
| PR | M Przysiężny | 4 | 6 | 7$^7$ | PR | M Przysiężny | 3 | 4 | | | | | | | | | | |
| | T Kamke | 6 | 6 | | | T Kamke | 6 | 6 | | | | | | | | | | |
| | E Leshem | 2 | 2 | | | | | | | | T Kamke | 4 | 0 | | | | | |
| | C İlkel | 3 | 2 | | | | | | | | T Pütz | 6 | 6 | | | | | |
| | T Pütz | 6 | 6 | | | T Pütz | 7$^7$ | 6 | | | | | | | | | | |
| | P Gunneswaran | 6 | 1 | 6 | | P Gunneswaran | 6$^5$ | 2 | | | | | | | | | | |
| 4 | S Robert | 3 | 6 | 4 | | | | | | | | | | | T Pütz | 6 | 5 | 4 |
| 6 | S-w Kwon | 6 | 7$^7$ | | | | | | | | | | | 2 | J Thompson | 3 | 7 | 6 |
| | M Donati | 4 | 6$^5$ | | 6 | S-w Kwon | 4 | 7$^{12}$ | 6$^7$ | | | | | | | | | |
| | K Uchida | 6 | 3 | | | K Uchida | 6 | 6$^{10}$ | 7$^9$ | | | | | | | | | |
| Q | T Garanganga | 4 | 1$^r$ | | | | | | | | K Uchida | 6$^5$ | 0 | | | | | |
| | K Kravchuk | 6 | 7 | | | | | | | 2 | J Thompson | 7$^7$ | 6 | | | | | |
| WC | Shintaro Imai | 4 | 5 | | | K Kravchuk | 3 | 1 | | | | | | | | | | |
| Q | Z Li | 6 | 6$^4$ | 4 | 2 | J Thompson | 6 | 6 | | | | | | | | | | |
| 2 | J Thompson | 4 | 7$^7$ | 6 | | | | | | | | | | | | | | |