2003 WTA Tier I Series Singles Singles

| Tournament | Surface | Week | Winner | Finalist | Semifinalists |
|---|---|---|---|---|---|
| Canada (Toronto) | Hard | August 11 | Justine Henin-Hardenne 6–1, 6–0 | Lina Krasnoroutskaya | Paola Suárez Elena Dementieva |
| Moscow | Carpet (i) | September 29 | Anastasia Myskina 6–2, 6–4 | Amélie Mauresmo | Anna Pistolesi Elena Dementieva |
| Zurich | Carpet (i) | October 13 | Justine Henin-Hardenne 6–0, 6–4 | Jelena Dokić | Kim Clijsters Nadia Petrova |