| Women's singles | |
|---|---|
| 1988 OTB Open | |
| Champion |  Gretchen Magers |
| Runner-up | Terry Phelps |
| Final score | 7–6, 6–4 |
| Draw | 32 |
| Seeds | 8 |
Camille Benjamin was the defending champion but lost in the semifinals to Terry Phelps.
Gretchen Magers won in the final 7–6, 6–4 against Phelps.
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
Elly Hakami (quarterfinals) Gretchen Magers (champion) Wendy White (second round) Terry Phelps (final) Ann Henricksson (first round) Camille Benjamin (semifinals) Lisa Bonder (first round) Amy Frazier (first round)| First round | Second round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||||||||
| 1 | E Hakami | 6 | 6 | |||||||||||||||||||||||||||||||
| M Quinlan | 2 | 4 | 1 | E Hakami | 6 | 6 | ||||||||||||||||||||||||||||
 J Salmon | 4 | 7 | 0 |  C Bakkum | 4 | 4 | ||||||||||||||||||||||||||||
| C Bakkum | 6 | 6 | 6 | 1 | E Hakami | 3 | 4 | |||||||||||||||||||||||||||
| B Herr | 4 | 6 | 6 | 6 | C Benjamin | 6 | 6 | |||||||||||||||||||||||||||
 J Richardson | 6 | 3 | 2 | B Herr | 3 | 6 | 2 | |||||||||||||||||||||||||||
| T Mochizuki | 3 | 6 | 6 | C Benjamin | 6 | 4 | 6 | |||||||||||||||||||||||||||
| 6 | C Benjamin | 6 | 7 | 6 | C Benjamin | 3 | 3 | |||||||||||||||||||||||||||
| 4 | T Phelps | 3 | 6 | 7 | 4 | T Phelps | 6 | 6 | ||||||||||||||||||||||||||
 L Barnard | 6 | 0 | 5 | 4 | T Phelps | 6 | 7 | |||||||||||||||||||||||||||
| C Christian | 7 | 6 | C Christian | 2 | 6 | |||||||||||||||||||||||||||||
| A Leand | 5 | 1 | 4 | T Phelps | 6 | 6 | ||||||||||||||||||||||||||||
| J Ingram | 6 | 7 | R Reis | 3 | 2 | |||||||||||||||||||||||||||||
| M Brown | 1 | 6 | J Ingram | 2 | 1 | |||||||||||||||||||||||||||||
| R Reis | 6 | 6 | R Reis | 6 | 6 | |||||||||||||||||||||||||||||
| 7 | L Bonder | 4 | 3 | 4 | Terry Phelps | 6 | 4 | |||||||||||||||||||||||||||
| 5 | A Henricksson | 4 | 0 | 2 | Gretchen Magers | 7 | 6 | |||||||||||||||||||||||||||
| Q | S Martin | 6 | 6 | Q | S Martin | 2 | 6 | 6 | ||||||||||||||||||||||||||
| P Casale | 7 | 6 | 3 | L Gregory | 6 | 2 | 1 | |||||||||||||||||||||||||||
| L Gregory | 5 | 7 | 6 | Q | S Martin | 6 | 6 | |||||||||||||||||||||||||||
| C MacGregor | 6 | 6 | 2 | Q | C Cunningham | 1 | 3 | |||||||||||||||||||||||||||
| Q | C Cunningham | 7 | 3 | 6 | Q | C Cunningham | 6 | 6 | ||||||||||||||||||||||||||
| L Allen | 6 | 6 | 4 | 3 | W White | 3 | 1 | |||||||||||||||||||||||||||
| 3 | W White | 3 | 7 | 6 | Q | S Martin | 2 | 6 | ||||||||||||||||||||||||||
| 8 | A Frazier | 0 | 0 | 2 | G Magers | 6 | 7 | |||||||||||||||||||||||||||
| Q |  R Baranski | 6 | 6 | Q | R Baranski | 3 | 3 | |||||||||||||||||||||||||||
| V Nelson-Dunbar | 6 | 2 | 3 |  A Nishiya | 6 | 6 | ||||||||||||||||||||||||||||
| A Nishiya | 1 | 6 | 6 | Q | A Nishiya | 6 | 0 | |||||||||||||||||||||||||||
| Q | A Grossman | 6 | 6 | 2 | G Magers | 7 | 6 | |||||||||||||||||||||||||||
| V Lake | 1 | 3 | Q | A Grossman | 4 | 3 | ||||||||||||||||||||||||||||
| L Antonoplis | 3 | 6 | 1 | 2 | G Magers | 6 | 6 | |||||||||||||||||||||||||||
| 2 | G Magers | 6 | 4 | 6 | ||||||||||||||||||||||||||||||
Gretchen Magers was the defending champion but lost in the quarterfinals to Sara Gomer.
Jill Hetherington won in the final 6–2, 6–1 against Katrina Adams.
Patty Fendick and Jill Hetherington won in the final 6–3, 6–3 against Belinda Cordwell and Julie Richardson.
Pam Shriver was the defending champion but lost in the semifinals to Barbara Potter.
Pam Shriver was the defending champion but did not compete that year.
Pam Shriver was the defending champion but lost in the quarterfinals to Terry Phelps.
Ann Henricksson and Christiane Jolissaint were the defending champions but only Henricksson competed that year with Gretchen Magers.
Steffi Graf was the defending champion and won in the final 6–1, 6–4 against Ann Henricksson.
Steffi Graf was the defending champion but did not compete that year.
Steffi Graf was the defending champion going into the final against her rival Gabriela Sabatini. Just the previous month, Sabatini defeated Steffi Graf 3–6, 6–3, 7–5 in the final at Amelia Island, Florida. Now, in her native Germany, Steffi would turn the tables against Sabatini, beating her 6–3, 6–1. Prior to this match, Sabatini had played in four finals in 1989, with her winning twice. For Steffi, this victory was her seventh of the year, and marked the sixteenth time out of nineteen matches she had beaten Sabatini.
Isabelle Demongeot and Nathalie Tauziat were the defending champions but lost in the quarterfinals to Lise Gregory and Gretchen Magers.
Larisa Savchenko and Natasha Zvereva were the defending champions and won in the final 7–5, 5–7, 6–0 against Leila Meskhi and Svetlana Parkhomenko.
Gretchen Magers was the defending champion but lost in the semifinals to Laura Gildemeister.
Ann Henricksson and Julie Richardson were the defending champions but only Henricksson competed that year with Gretchen Magers.
Patty Fendick and Jill Hetherington were the defending champions but lost in the quarterfinals to Gretchen Magers and Robin White.
Chris Evert was the defending champion of the singles event at the Virginia Slims of Los Angeles tennis tournament but did not compete that year.
Jenni Goodling and Wendy Wood were the defending champions but did not compete that year.
Stephanie Rehe was the defending champion but lost in the quarterfinals to Gigi Fernández.
Seventh-seeded sisters Katerina Maleeva and Manuela Maleeva claimed the title by defeating third-seeds Penny Barg and Paula Smith in the final.
Fourth-seeded Andrea Temesvári was the defending champion but went out in the semifinals to Manuela Maleeva. Top-seed Maleeva won the final and $34,000 first prize money by defeating Lisa Bonder-Kreiss in the final.