1989 WTA Tier I Series
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DurationMarch 20 – May 15
Tournaments2
Most titles
Gabriela Sabatini
Steffi Graf (1)
Gabriela Sabatini 
Steffi Graf (1)Most finals Gabriela Sabatini (2)
Gabriela Sabatini (2)| Details | |
|---|---|
| Duration | March 20 – May 15 |
| Tournaments | 2 |
| Achievements (singles) | |
| Most titles | Gabriela Sabatini Steffi Graf (1) |
| Most finals | Gabriela Sabatini (2) |
← 1988 1990 → | |
The table below shows the 1989 WTA Tier I Series schedule.
| Tournament | Surface | Week | Winner | Finalist | Semi finalists | Quarter finalists |
|---|---|---|---|---|---|---|
| Key Biscayne | Hard | March 20 | Gabriela Sabatini 6–1, 4–6, 6–2 |
 Chris Evert |
 Helena Suková Zina Garrison Jackson |
 Isabelle Demongeot  Raffaella Reggi-Concato Jana Novotná  Helen Kelesi |
| Berlin | Clay | May 15 | Steffi Graf 6–3, 6–1 |
Gabriela Sabatini |
Isabel Cueto Helen Kelesi |
Sandra Cecchini  Barbara Paulus Regina Rajchrtová Sylvia Hanika |