2005 WTA Tier I Series Singles Singles

| Tournament | Surface | Week | Winner | Finalist | Semifinalists |
|---|---|---|---|---|---|
| Tokyo | Carpet (i) | January 31 | Maria Sharapova 6-1, 3-6, 7-6(5) | Lindsay Davenport | Svetlana Kuznetsova Shinobu Asagoe |
| Indian Wells | Hard | March 7 | Kim Clijsters 6-4, 4-6, 6-2 | Lindsay Davenport | Maria Sharapova Elena Dementieva |
| Miami | Hard | March 21 | Kim Clijsters 6-3, 7-5 | Maria Sharapova | Amélie Mauresmo Venus Williams |
| Charleston | Clay | April 11 | Justine Henin-Hardenne 7-5, 6-4 | Elena Dementieva | Tatiana Golovin Patty Schnyder |
| Berlin | Clay | May 2 | Justine Henin-Hardenne 6-3, 4-6, 6-3 | Nadia Petrova | Patty Schnyder Jelena Janković |
| Rome | Clay | May 9 | Amélie Mauresmo 2-6, 6-3, 6-4 | Patty Schnyder | Maria Sharapova Vera Zvonareva |