Singles
| Tournament | Surface | Week | Winner | Finalist | Semifinalists | Quarterfinalists |
|---|---|---|---|---|---|---|
| Tokyo | Carpet (i) | January 27 | Lindsay Davenport 6–7(6), 6–1, 6–2 |
Monica Seles | Chanda Rubin Lisa Raymond |
Lina Krasnoroutskaya Elena Dementieva Tamarine Tanasugarn Jelena Dokić |
| Indian Wells | Hard | March 3 | Kim Clijsters 6–4, 7–5 |
Lindsay Davenport | Conchita Martínez Jennifer Capriati |
Chanda Rubin Amanda Coetzer Amélie Mauresmo Vera Zvonareva |
| Miami | Hard | March 17 | Serena Williams 4–6, 6–4, 6–1 |
Jennifer Capriati | Kim Clijsters Chanda Rubin |
Marion Bartoli Jelena Dokić Justine Henin-Hardenne Meghann Shaughnessy |
| Charleston | Clay | April 7 | Justine Henin-Hardenne 6–3, 6–4 |
Serena Williams | Lindsay Davenport Ashley Harkleroad |
Jelena Dokić Vera Zvonareva Daniela Hantuchová Mary Pierce |
| Berlin | Clay | May 5 | Justine Henin-Hardenne 6–4, 4–6, 7–5 |
Kim Clijsters | Jennifer Capriati Amélie Mauresmo |
Daniela Hantuchová Elena Likhovtseva Iroda Tulyaganova Vera Zvonareva |
| Rome | Clay | May 12 | Kim Clijsters 3–6, 7–6(3), 6–0 |
Amélie Mauresmo | Serena Williams Ai Sugiyama |
Conchita Martínez Jennifer Capriati Tina Pisnik Anastasia Myskina |
| Canada (Toronto) | Hard | August 11 | Justine Henin-Hardenne 6–1, 6–0 |
Lina Krasnoroutskaya | Paola Suárez Elena Dementieva |
Katarina Srebotnik Vera Zvonareva Amélie Mauresmo Elena Bovina |
| Moscow | Carpet (i) | September 29 | Anastasia Myskina 6–2, 6–4 |
Amélie Mauresmo | Anna Pistolesi Elena Dementieva |
Elena Bovina Eleni Daniilidou Francesca Schiavone Vera Zvonareva |
| Zurich | Carpet (i) | October 13 | Justine Henin-Hardenne 6–0, 6–4 |
Jelena Dokić | Kim Clijsters Nadia Petrova |
Tina Pisnik Patty Schnyder Elena Bovina Vera Zvonareva |
Read more about this topic: 2003 WTA Tier I Series