2004 WTA Tier I Series Singles Singles

| Tournament | Surface | Week | Winner | Finalist | Semifinalists |
|---|---|---|---|---|---|
| Tokyo | Carpet (i) | February 2 | Lindsay Davenport 6–4, 6–1 | Magdalena Maleeva | Chanda Rubin Jelena Dokić |
| Indian Wells | Hard | March 8 | Justine Henin-Hardenne 6–1, 6–4 | Lindsay Davenport | Anastasia Myskina Nathalie Dechy |
| Miami | Hard | March 22 | Serena Williams 6–1, 6–1 | Elena Dementieva | Eleni Daniilidou Nadia Petrova |
| Charleston | Clay | April 12 | Venus Williams 2–6, 6–2, 6–1 | Conchita Martínez | Jelena Kostanić Patty Schnyder |
| Berlin | Clay | May 3 | Amélie Mauresmo w/o | Venus Williams | Karolina Šprem Jennifer Capriati |
| Rome | Clay | May 10 | Amélie Mauresmo 3–6, 6–3, 7–6(6) | Jennifer Capriati | Serena Williams Vera Zvonareva |