The table below shows the 1988 WTA Tier I Series schedule.
| Details | |
|---|---|
| Duration | March 14 – May 9 |
| Tournaments | 2 |
| Achievements (singles) | |
| Most tournament titles |  Steffi Graf (2) |
| Most tournament finals | Steffi Graf (2) |
1989 → | |
Singles
edit| Tournament | Surface | Week | Winner | Finalist | Semi finalists | Quarter finalists |
|---|---|---|---|---|---|---|
| Key Biscayne | Hard | March 14 | Steffi Graf (1) 6–4, 6–4 |
 Chris Evert (2)
|
Stephanie Rehe Mary Joe Fernandez (15)
|
Claudia Kohde-Kilsch (6) Barbara Potter (9) Elna Reinach  Helena Suková (5)
|
| Berlin | Clay | May 9 | Steffi Graf (1) 6–3, 6–2 |
Helena Suková (2)
|
Claudia Kohde-Kilsch (3) Sylvia Hanika (7)
|
 Nicole Bradtke  Sandra Cecchini (6) Radka Zrubáková Mary Joe Fernandez (8)
|