1998 Japan Open Tennis Championships – Women's Singles
| Women's Singles | |
|---|---|
| 1998 Japan Open Tennis Championships | |
| 1997 Champion |
 Ai Sugiyama
|
| Champion |
Ai Sugiyama
|
| Runner-up |
 Corina Morariu
|
| Final score | 6–3, 6–3 |
Ai Sugiyama was the defending champion and won in the final 6–3, 6–3 against Corina Morariu.
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated. The top two seeds received a bye to the second round.
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