| Women's singles | |
|---|---|
| 1985 Japan Open Tennis Championships | |
| Champion |  Gabriela Sabatini |
| Runner-up |  Linda Gates |
| Score | 6–3, 6–4 |
| Draw | 32 (3Q) |
| Seeds | 8 |
Lilian Drescher was the defending champion, but lost in the semifinals to Gabriela Sabatini.
Sabatini won the title by defeating Linda Gates 6–3, 6–4 in the final. [1]
Gabriela Sabatini (champion) Beth Herr (second round)
Lilian Drescher (semifinals)
Mima Jaušovec (first round)
Angeliki Kanellopoulou (quarterfinals)
Laura Gildemeister (semifinals)
Andrea Holíková (quarterfinals)
Myriam Schropp (quarterfinals)| Semifinals | Final | ||||||||||||
| 1 | Gabriela Sabatini | 1 | 6 | 6 | |||||||||
| 3 | Lilian Drescher | 6 | 3 | 3 | |||||||||
| 1 | Gabriela Sabatini | 6 | 6 | ||||||||||
| Linda Gates | 3 | 4 | |||||||||||
| 6 | Laura Gildemeister | 3 | 6 | 3 | |||||||||
| Linda Gates | 6 | 2 | 6 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | G Sabatini | 6 | 6 | ||||||||||||||||||||||||
 E Okagawa | 1 | 1 | 1 | G Sabatini | 6 | 6 | |||||||||||||||||||||
| Q | O Tsarbopoulou | 2 | 4 | K Kinney | 0 | 0 | |||||||||||||||||||||
| K Kinney | 6 | 6 | 1 | G Sabatini | 6 | 6 | |||||||||||||||||||||
| M Yanagi | 6 | 6 | 7 | A Holíková | 0 | 1 | |||||||||||||||||||||
| P Vásquez | 1 | 1 | ' M Yanagi | 6 | 2 | 1 | |||||||||||||||||||||
 J Young | 3 | 1 | 7 | A Holíková | 3 | 6 | 6 | ||||||||||||||||||||
| 7 | A Holíková | 6 | 6 | 1 | G Sabatini | 1 | 6 | 6 | |||||||||||||||||||
| 3 | L Drescher | 6 | 6 | 3 | L Drescher | 6 | 3 | 3 | |||||||||||||||||||
 C Bartos-Cserepy | 3 | 2 | 3 | L Drescher | 6 | 6 | |||||||||||||||||||||
| Rie Nakazawa | 4 | 2 | A Kijimuta | 3 | 0 | ||||||||||||||||||||||
| A Kijimuta | 6 | 6 | 3 | L Drescher | 6 | 6 | |||||||||||||||||||||
 N Dias | 1 | 1 | 5 | A Kanellopoulou | 3 | 1 | |||||||||||||||||||||
| M Paz | 6 | 6 | M Paz | 0 | 4 | ||||||||||||||||||||||
| P Medrado | 5 | 6 | 5 | A Kanellopoulou | 6 | 6 | |||||||||||||||||||||
| 5 | A Kanellopoulou | 7 | 7 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | L Gildemeister | 6 | 7 | ||||||||||||||||||||||||
| Q | D Farrell | 2 | 6 | 6 | L Gildemeister | 6 | 6 | 7 | |||||||||||||||||||
 J Thompson | 6 | 6 | J Thompson | 7 | 3 | 6 | |||||||||||||||||||||
| Q |  J Louis | 3 | 4 | 6 | L Gildemeister | 6 | 4 | 6 | |||||||||||||||||||
| H Ludloff | 2 | 3 | A Holton | 3 | 6 | 0 | |||||||||||||||||||||
 B Cordwell | 6 | 6 | B Cordwell | 4 | 4 | ||||||||||||||||||||||
| A Holton | 2 | 7 | 6 | A Holton | 6 | 6 | |||||||||||||||||||||
| 4 | M Jaušovec | 6 | 5 | 3 | 6 | L Gildemeister | 3 | 6 | 3 | ||||||||||||||||||
| 8 | M Schropp | 1 | 6 | 6 | L Gates | 6 | 2 | 6 | |||||||||||||||||||
| Y Koizumi | 6 | 3 | 2 | 8 | M Schropp | 7 | 7 | ||||||||||||||||||||
| E Inoue | 6 | 6 | E Inoue | 5 | 5 | ||||||||||||||||||||||
| A Villagrán | 1 | 2 | 8 | M Schropp | 4 | 4 | |||||||||||||||||||||
| L Gates | 6 | 3 | 6 | L Gates | 6 | 6 | |||||||||||||||||||||
 M Lindström | 1 | 6 | 4 | L Gates | 6 | 6 | |||||||||||||||||||||
| S Foltz | 6 | 4 | 3 | 2 | B Herr | 3 | 1 | ||||||||||||||||||||
| 2 | B Herr | 4 | 6 | 6 | |||||||||||||||||||||||
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