2005 WTA Tier I Series Singles Singles

| Tournament | Surface | Week | Winner | Finalist | Semifinalists |
|---|---|---|---|---|---|
| San Diego | Hard | August 1 | Mary Pierce 6-0, 6-3 | Ai Sugiyama | Shuai Peng Akiko Morigami |
| Toronto | Hard | August 15 | Kim Clijsters 7-5, 6-1 | Justine Henin-Hardenne | Anastasia Myskina Amélie Mauresmo |
| Moscow | Carpet (i) | October 10 | Mary Pierce 6-4, 6-3 | Francesca Schiavone | Dinara Safina Elena Dementieva |
| Zurich | Carpet (i) | October 17 | Lindsay Davenport 7-6(5), 6-3 | Patty Schnyder | Anastasia Myskina Ana Ivanovic |