# 1999 Japan Open Tennis Championships – Women's singles

The 19999 Japan Open Tennis Championships women's singles was the women's singles event of the twenty-fifth edition of the Japan Open; a WTA Tier III tournament held in Tokyo, Japan. Ai Sugiyama was the defending champion but lost in the final 6–2, 6–2 against Amy Frazier.

## Seeds

* Ai Sugiyama (final)
* Amy Frazier (champion)
* Corina Morariu (semifinals)
* Kimberly Po (second round)
* Kristina Brandi (first round)
* Meghann Shaughnessy (first round)
* Jane Chi (semifinals)
* Wang Shi-ting (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 |
| 1 | Ai Sugiyama | 7$^7$ | 6 | | | | | |
| 7 | Jane Chi | 6$^5$ | 3 | | | | | |
| 7 | Jane Chi | 6$^5$ | 3 | | 1 | Ai Sugiyama | 2 | 2 |
| | | | | | 2 | Amy Frazier | 6 | 6 |
| 3 | Corina Morariu | 4 | 7 | 3 | 2 | Amy Frazier | 6 | 6 |
| 2 | Amy Frazier | 6 | 5 | 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | A Sugiyama | 6 | 6 | | | | | | | | | | | | | | |
| LL | W Prakusya | 1 | 3 | | 1 | A Sugiyama | 6 | 6 | | | | | | | | | |
| | L Němečková | 7 | 6 | | | L Němečková | 4 | 1 | | | | | | | | | |
| Q | K Schlukebir | 5 | 4 | | | | | | | 1 | A Sugiyama | 6 | 6 | | | | |
| | S Reeves | 2 | 2 | | | | | | | | J Lee | 4 | 0 | | | | |
| | J Lee | 6 | 6 | | | J Lee | 7$^7$ | 6 | | | | | | | | | |
| | J Watanabe | 6 | 6 | | | J Watanabe | 6$^4$ | 3 | | | | | | | | | |
| 5 | K Brandi | 4 | 2 | | | | | | | | | | | 1 | A Sugiyama | 7$^7$ | 6 |
| 4 | K Po | 7 | 6 | | | | | | | | | | | 7 | J Chi | 6$^5$ | 3 |
| | M Saeki | 5 | 2 | | 4 | K Po | 5 | 6 | 3 | | | | | | | | |
| | S-h Park | 4 | 2 | | | S Kleinová | 7 | 4 | 6 | | | | | | | | |
| | S Kleinová | 6 | 6 | | | | | | | | S Kleinová | 2 | 0$^r$ | | | | |
| Q | M Miyauchi | 6 | 3 | 4 | | | | | | 7 | J Chi | 6 | 3 | | | | |
| | S de Beer | 4 | 6 | 6 | | S de Beer | 4 | 3 | | | | | | | | | |
| Q | Y-j Cho | 4 | 1 | | 7 | J Chi | 6 | 6 | | | | | | | | | |
| 7 | J Chi | 6 | 6 | | | | | | | | | | | | | | |

### Bottom half

| 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 |
| 8 | S-t Wang | 6 | 6 | | | | | | | | | | | | | | | |
| WC | S Obata | 4 | 2 | 8 | S-t Wang | 6 | 6 | | | | | | | | | | | |
| | S Noorlander | 4 | 6$^5$ | | Y Yoshida | 1 | 4 | | | | | | | | | | | |
| | Y Yoshida | 6 | 7$^7$ | | | | | | 8 | S-t Wang | 7$^7$ | 3 | 4 | | | | | |
| | M Washington | 6 | 6 | | | | | | 3 | C Morariu | 6$^3$ | 6 | 6 | | | | | |
| Q | H Collin | 3 | 4 | | M Washington | 2 | 0 | | | | | | | | | | | |
| | M Maruska | 3 | 2 | 3 | C Morariu | 6 | 6 | | | | | | | | | | | |
| 3 | C Morariu | 6 | 6 | | | | | | | | | | | 3 | C Morariu | 4 | 7 | 3 |
| 6 | M Shaughnessy | 3 | 5 | | | | | | | | | | | 2 | A Frazier | 6 | 5 | 6 |
| | M Tu | 6 | 7 | | M Tu | 2 | 6 | 6 | | | | | | | | | | |
| | L Wild | 3 | 1 | WC | S Asagoe | 6 | 3 | 3 | | | | | | | | | | |
| WC | S Asagoe | 6 | 6 | | | | | | | M Tu | 7 | 4 | 4 | | | | | |
| | L Andretto | 4 | 3 | | | | | | 2 | A Frazier | 5 | 6 | 6 | | | | | |
| | K-A Guse | 6 | 6 | | K-A Guse | 6$^3$ | 0 | | | | | | | | | | | |
| | H Inoue | 0 | 3 | 2 | A Frazier | 7$^7$ | 6 | | | | | | | | | | | |
| 2 | A Frazier | 6 | 6 | | | | | | | | | | | | | | | |

## Qualifying
### Seeds

* Wynne Prakusya (qualifying competition, lucky loser)
* Kim Eun-ha (second round)
* Cho Yoon-jeong (qualifier)
* Katie Schlukebir (qualifier)
* Misumi Miyauchi (qualifier)
* Akiko Morigami (second round)
* Tomoe Hotta (first round)
* Adrienn Hegedűs (first round)

### Qualifiers

* Misumi Miyauchi
* Cho Yoon-jeong
* Katie Schlukebir
* Hannah Collin

### Lucky losers

* Wynne Prakusya

## Qualifying 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

### First qualifier

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Wynne Prakusya | 6 | 6 | | | | | | | | | | |
| | Keiko Tameishi | 0 | 0 | | | | | | | | | | |
| | Keiko Tameishi | 0 | 0 | | 1 | Wynne Prakusya | 6 | 7$^9$ | | | | | |
| | | | | | | Yoshiko Sasano | 4 | 6$^7$ | | | | | |
| | Yoshiko Sasano | 6 | 7 | | | Yoshiko Sasano | 4 | 6$^7$ | | | | | |
| | Miyako Ataka | 1 | 5 | | | | | | | | | | |
| | Miyako Ataka | 1 | 5 | | | | | | | 1 | Wynne Prakusya | 3 | 2 |
| | | | | | | | | | | 5 | Misumi Miyauchi | 6 | 6 |
| | Shiho Hisamatsu | 2 | | | | | | | | | | | | 5 | Misumi Miyauchi | 6 | 6 |
| | Akiko Gunji | 1$^r$ | | | | | | | | | | | |
| | Akiko Gunji | 1$^r$ | | | | Shiho Hisamatsu | 7 | 2 | 1 | | | | |
| | | | | | 5 | Misumi Miyauchi | 5 | 6 | 6 | | | | |
| | Sachie Umehara | 6 | 4 | 1 | 5 | Misumi Miyauchi | 5 | 6 | 6 | | | | |
| 5 | Misumi Miyauchi | 2 | 6 | 6 | | | | | | | | | |

### Second qualifier

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Cho Yoon-jeong | 6 | 6 | | | | | | | | |
| | Madoka Kuki | 2 | 0 | | | | | | | | |
| | Madoka Kuki | 2 | 0 | 3 | Cho Yoon-jeong | 6 | 6 | | | | |
| | | | | | Maiko Inoue | 2 | 4 | | | | |
| | Maiko Inoue | 6 | 6 | | Maiko Inoue | 2 | 4 | | | | |
| | Kazue Takuma | 2 | 0 | | | | | | | | |
| | Kazue Takuma | 2 | 0 | | | | | 3 | Cho Yoon-jeong | 6 | 6 |
| | | | | | | | | | Iroda Tulyaganova | 4 | 3 |
| | Keiko Nagatomi | 6 | 6 | | | | | | | | | Iroda Tulyaganova | 4 | 3 |
| WC | Yumi Yokoi | 3 | 2 | | | | | | | | |
| WC | Yumi Yokoi | 3 | 2 | | Keiko Nagatomi | 0 | 4 | | | | |
| | | | | | Iroda Tulyaganova | 6 | 6 | | | | |
| | Iroda Tulyaganova | 6 | 6 | | Iroda Tulyaganova | 6 | 6 | | | | |
| 8 | Adrienn Hegedűs | 3 | 2 | | | | | | | | |

### Third qualifier

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 7 | Tomoe Hotta | 6 | 2 | 6$^3$ | | | | | | | | |
| | Akiko Kinebuchi | 4 | 6 | 7$^7$ | | | | | | | | |
| | Akiko Kinebuchi | 4 | 6 | 7$^7$ | | Akiko Kinebuchi | 6 | 6 | | | | |
| | | | | | | Hiroko Mochizuki | 1 | 3 | | | | |
| | Hiroko Mochizuki | 1 | 6 | 6 | | Hiroko Mochizuki | 1 | 3 | | | | |
| | Riei Otakeyama | 6 | 3 | 4 | | | | | | | | |
| | Riei Otakeyama | 6 | 3 | 4 | | | | | | Akiko Kinebuchi | 5 | 4 |
| | | | | | | | | | 4 | Katie Schlukebir | 7 | 6 |
| | Seiko Okamoto | 4 | 6 | 6 | | | | | | | | | 4 | Katie Schlukebir | 7 | 6 |
| | Benjamas Sangaram | 6 | 4 | 1 | | | | | | | | |
| | Benjamas Sangaram | 6 | 4 | 1 | | Seiko Okamoto | 3 | 0 | | | | |
| | | | | | 4 | Katie Schlukebir | 6 | 6 | | | | |
| | Nami Urabe | 3 | 3 | | 4 | Katie Schlukebir | 6 | 6 | | | | |
| 4 | Katie Schlukebir | 6 | 6 | | | | | | | | | |

### Fourth qualifier

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 6 | Akiko Morigami | 6 | 6 | | | | | | | | | | |
| | Keiko Ishida | 0 | 2 | | | | | | | | | | |
| | Keiko Ishida | 0 | 2 | | 6 | Akiko Morigami | 6 | 4 | 1 | | | | |
| | | | | | | Hannah Collin | 1 | 6 | 6 | | | | |
| | Hannah Collin | 6 | 6 | | | Hannah Collin | 1 | 6 | 6 | | | | |
| WC | Eri Ohmi | 0 | 2 | | | | | | | | | | |
| WC | Eri Ohmi | 0 | 2 | | | | | | | | Hannah Collin | 6 | 6 |
| | | | | | | | | | | WC | Keiko Taguchi | 0 | 2 |
| | Chiaki Nakajima | 1 | 7$^9$ | 3 | | | | | | | | | | WC | Keiko Taguchi | 0 | 2 |
| WC | Keiko Taguchi | 6 | 6$^7$ | 6 | | | | | | | | | |
| WC | Keiko Taguchi | 6 | 6$^7$ | 6 | WC | Keiko Taguchi | 6 | 2 | 6 | | | | |
| | | | | | 2 | Kim Eun-ha | 4 | 6 | 4 | | | | |
| WC | Kaori Goto | 4 | 1 | | 2 | Kim Eun-ha | 4 | 6 | 4 | | | | |
| 2 | Kim Eun-ha | 6 | 6 | | | | | | | | | | |