| Details | |
|---|---|
| Duration | March 14 – May 9 |
| Tournaments | 2 |
| Achievements (singles) | |
| Most tournament titles |  Steffi Graf (2) |
| Most tournament finals | Steffi Graf (2) |
1989 → | |
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 → | |
The table below shows the 1988 WTA Tier I Series schedule.
| 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) |
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