| Women's singles | |
|---|---|
| 1989 Suntory Japan Open Tennis Championships | |
| Champion |  Kumiko Okamoto |
| Runner-up |  Elizabeth Smylie |
| Final score | 6–4, 6–2 |
Patty Fendick was the defending champion but did not compete that year.
Kumiko Okamoto won in the final 6–4, 6–2 against Elizabeth Smylie.
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
Anne Minter (semifinals)
Belinda Cordwell (semifinals)
Ann Henricksson (second round)
Sandra Wasserman (quarterfinals) Etsuko Inoue (quarterfinals) Betsy Nagelsen (quarterfinals)
Monique Javer (second round) Louise Allen (first round)Andriy Medvedev was the defending champion but lost in the second round to Jordi Burillo.
Thomas Enqvist was the defending champion but lost in the semifinals to Jonas Björkman.
Pete Sampras won the title, defeating Jonas Björkman in the final, 6–3, 4–6, 6–3, 6–1
Petr Korda was the defending champion, but lost in the second round to Thomas Johansson.
Conchita Martínez was the defending champion but lost in the quarterfinals to Mary Pierce.
Sabine Appelmans was the defending champion but lost in the second round to Barbara Rittner.
Irina Spîrlea was the defending champion but did not compete that year.
Steffi Graf was the defending champion but did not compete that year.
Steffi Graf was the defending champion but lost in the semifinals to Gabriela Sabatini.
Anke Huber was the defending champion but lost in the semifinals to Miriam Oremans.
Lindsay Davenport won in the final 6–4, 6–1 against Sandrine Testud.
Anke Huber was the defending champion but lost in the semifinals to Jana Novotná.
Conchita Martínez was the defending champion, but lost in the semifinals to Jana Novotná.
Jana Novotná was the defending champion but lost in the quarterfinals to Lindsay Davenport.
Martina Navratilova was the defending champion but did not compete that year.
Arantxa Sánchez Vicario was the defending champion and won in the final 6–1, 6–4 against Gabriela Sabatini.
Martina Navratilova was the defending champion but lost in the semifinals to Gabriela Sabatini.
Lindsay Davenport was the defending champion but lost in the semifinals to Mary Pierce.
Monica Seles was the defending champion but lost in the semifinals to Lindsay Davenport.
Gabriela Sabatini was the defending champion and won in the final 6–0, 6–2 against Isabel Cueto.
Manuela Maleeva was the defending champion but lost in the second round to Catarina Lindqvist.
