# 2008 AIG Japan Open Tennis Championships – Women's singles

Virginie Razzano was the defending champion, but chose not to participate that year.
First-seeded Caroline Wozniacki won in the final 6–2, 3–6, 6–1, against fifth-seeded Kaia Kanepi.

## Seeds

* Caroline Wozniacki (champion)
* Anabel Medina Garrigues (second round)
* Zheng Jie (first round)
* Maria Kirilenko (first round)
* Kaia Kanepi (final)
* Shahar Pe'er (second round)
* Tamarine Tanasugarn (quarterfinals)
* Aleksandra Wozniak (semifinals)

## 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 | Final | Final | Final | Final | Final |
| 1 | Caroline Wozniacki | 6 | 6 | | | | | |
| LL | Jarmila Gajdošová | 4 | 3 | | | | | |
| LL | Jarmila Gajdošová | 4 | 3 | 1 | Caroline Wozniacki | 6 | 3 | 6 |
| | | | | 5 | Kaia Kanepi | 2 | 6 | 1 |
| 5 | Kaia Kanepi | 6 | 6 | 5 | Kaia Kanepi | 2 | 6 | 1 |
| 8 | Aleksandra Wozniak | 4 | 4 | | | | | |

### 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 | C Wozniacki | 4 | 6 | 6 | | | | | | | | | | | | | |
| | G Dulko | 6 | 0 | 3 | 1 | C Wozniacki | 6 | 6 | | | | | | | | | |
| | M Erakovic | 1 | 4 | | WC | A Morita | 2 | 1 | | | | | | | | | |
| WC | A Morita | 6 | 6 | | | | | | | 1 | C Wozniacki | 6 | 6 | | | | |
| | C Pin | 6 | 7 | | | | | | | 7 | T Tanasugarn | 4 | 1 | | | | |
| | C Suárez Navarro | 0 | 5 | | | C Pin | 2 | 2 | | | | | | | | | |
| Q | S Dubois | 1 | 3 | | 7 | T Tanasugarn | 6 | 6 | | | | | | | | | |
| 7 | T Tanasugarn | 6 | 6 | | | | | | | | | | | 1 | C Wozniacki | 6 | 6 |
| 4 | M Kirilenko | 6 | 2 | 5 | | | | | | | | | | LL | J Gajdošová | 4 | 3 |
| | K Zakopalová | 4 | 6 | 7 | | K Zakopalová | 6 | 6 | | | | | | | | | |
| WC | A Nakamura | 4 | 5 | | | M Domachowska | 3 | 0 | | | | | | | | | |
| | M Domachowska | 6 | 7 | | | | | | | | K Zakopalová | 5 | 5 | | | | |
| | M Santangelo | 4 | 6$^0$ | | | | | | | LL | J Gajdošová | 7 | 7 | | | | |
| LL | J Gajdošová | 6 | 7 | | LL | J Gajdošová | 5 | 6 | 7 | | | | | | | | |
| | K Date-Krumm | 3 | 1 | | 6 | S Pe'er | 7 | 1 | 6$^9$ | | | | | | | | |
| 6 | S Pe'er | 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 |
| 5 | K Kanepi | 4 | 6 | 6 | | | | | | | | | | | | | |
| | L Šafářová | 6 | 3 | 4 | 5 | K Kanepi | 3 | 6 | 6 | | | | | | | | |
| | I Benešová | 4 | 6 | 3 | | Y Wickmayer | 6 | 1 | 0 | | | | | | | | |
| | Y Wickmayer | 6 | 3 | 6 | | | | | | 5 | K Kanepi | 7$^7$ | 7$^7$ | | | | |
| | P Cetkovská | 6$^6$ | 4 | | | | | | | | A Pavlyuchenkova | 6$^4$ | 6$^1$ | | | | |
| Q | R Fujiwara | 7$_7$ | 6 | | Q | R Fujiwara | 2 | 2 | | | | | | | | | |
| | A Pavlyuchenkova | 6 | 6 | | | A Pavlyuchenkova | 6 | 6 | | | | | | | | | |
| 3 | J Zheng | 1 | 2 | | | | | | | | | | | 5 | K Kanepi | 6 | 6 |
| 8 | A Wozniak | 7 | 6$^2$ | 6 | | | | | | | | | | 8 | A Wozniak | 4 | 4 |
| | J Craybas | 5 | 7 | 3 | 8 | A Wozniak | 6 | 6 | | | | | | | | | |
| Q | R Fuda | 7 | 6 | | Q | R Fuda | 1 | 1 | | | | | | | | | |
| | P Parmentier | 5 | 2 | | | | | | | 8 | A Wozniak | 7 | 6 | | | | |
| | S Stosur | 6 | | | | | | | | | S Stosur | 5 | 3 | | | | |
| Q | V King | 2 | r | | | S Stosur | 6 | 7 | | | | | | | | | |
| | Y-j Chan | 6 | 3 | 3 | 2 | A Medina Garrigues | 1 | 5 | | | | | | | | | |
| 2 | A Medina Garrigues | 3 | 6 | 6 | | | | | | | | | | | | | |