# 2022 Shimadzu All Japan Indoor Tennis Championships – Singles

Xun Fangying was the defending champion but chose not to participate.
Miyu Kato won the title, defeating Yuriko Miyazaki in the final, 6–4, 2–6, 6–2.

## Seeds

* Misaki Doi (second round)
* Sachia Vickery (quarterfinals)
* Carol Zhao (semifinals)
* Yuriko Miyazaki (final)
* Kyōka Okamura (semifinals)
* Sakura Hosogi (quarterfinals)
* Peangtarn Plipuech (first round)
* Luksika Kumkhum (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 |
| Q | Miyu Kato | 6 | 6 | | | | | | |
| 3 | Carol Zhao | 4 | 4 | | | | | | |
| 3 | Carol Zhao | 4 | 4 | | Q | Miyu Kato | 6 | 2 | 6 |
| | | | | | 4 | Yuriko Miyazaki | 4 | 6 | 2 |
| 4 | Yuriko Miyazaki | 1 | 6 | 6 | 4 | Yuriko Miyazaki | 4 | 6 | 2 |
| 5 | Kyōka Okamura | 6 | 4 | 2 | | | | | |

### 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | M Doi | 6 | 6 | | | | | | | | | | | | | | |
| | E Hayashi | 1 | 3 | | 1 | M Doi | 4 | 6 | 4 | | | | | | | | |
| WC | A Omae | 2 | 2 | | Q | M Kato | 6 | 3 | 6 | | | | | | | | |
| Q | M Kato | 6 | 6 | | | | | | | Q | M Kato | 6 | 6 | | | | |
| WC | A Nagata | 1 | 4 | | | | | | | 6 | S Hosogi | 3 | 2 | | | | |
| | U Radwańska | 6 | 6 | | | U Radwańska | 3 | 4 | | | | | | | | | |
| | N Hanatani | 1 | 5 | | 6 | S Hosogi | 6 | 6 | | | | | | | | | |
| 6 | S Hosogi | 6 | 7 | | | | | | | | | | | Q | M Kato | 6 | 6 |
| 3 | C Zhao | 7 | 3 | 6 | | | | | | | | | | 3 | C Zhao | 4 | 4 |
| | H Kuwata | 5 | 6 | 2 | 3 | C Zhao | 6 | 6 | | | | | | | | | |
| Q | R Ueda | 6 | 6 | | Q | R Ueda | 0 | 4 | | | | | | | | | |
| | R Saigo | 0 | 1 | | | | | | | 3 | C Zhao | 6 | 7$^7$ | | | | |
| Q | S Saito | 6 | 4 | 6 | | | | | | 8 | L Kumkhum | 2 | 6$^2$ | | | | |
| Q | S Oshino | 2 | 6 | 2 | Q | S Saito | 1 | 6 | 4 | | | | | | | | |
| | P-c Lee | 1 | 1 | | 8 | L Kumkhum | 6 | 3 | 6 | | | | | | | | |
| 8 | L Kumkhum | 6 | 6 | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 7 | P Plipuech | 2 | 7 | 4 | | | | | | | | | | | | | | |
| | M Kobori | 6 | 5 | 6 | | M Kobori | 7 | 6 | | | | | | | | | | |
| WC | R Matsuda | 2 | 4 | | | H Arakawa | 5 | 3 | | | | | | | | | | |
| | H Arakawa | 6 | 6 | | | | | | | M Kobori | 6 | 4 | 3 | | | | | |
| | E Sema | 5 | 3 | | | | | | 4 | Y Miyazaki | 2 | 6 | 6 | | | | | |
| | J-h Choi | 7 | 6 | | | J-h Choi | 0 | 4 | | | | | | | | | | |
| | H Kaji | 6 | 3 | 1 | 4 | Y Miyazaki | 6 | 6 | | | | | | | | | | |
| 4 | Y Miyazaki | 3 | 6 | 6 | | | | | | | | | | 4 | Y Miyazaki | 1 | 6 | 6 |
| 5 | K Okamura | 6 | 6 | | | | | | | | | | | 5 | K Okamura | 6 | 4 | 2 |
| Q | A Matsumoto | 2 | 4 | | 5 | K Okamura | 7$^{10}$ | 7 | | | | | | | | | | |
| | Y-h Lee | 5 | 4 | | | N Sato | 6$^8$ | 5 | | | | | | | | | | |
| | N Sato | 7 | 6 | | | | | | 5 | K Okamura | 6 | 6$^5$ | 6 | | | | | |
| | E-s Liang | 6 | 6 | | | | | | 2 | S Vickery | 4 | 7$^7$ | 4 | | | | | |
| PR | A Shimizu | 1 | 2 | | | E-s Liang | 4 | 2 | | | | | | | | | | |
| Q | M Ozeki | 5 | 1 | | 2 | S Vickery | 6 | 6 | | | | | | | | | | |
| 2 | S Vickery | 7 | 6 | | | | | | | | | | | | | | | |