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Summary
Heat 1
| Rank | Name | Nation | Time |
| 1 | Ana Guevara | MEX | 50.93 |
| 2 | Lee McConnell | GBR | 51.19 |
| 3 | Grazyna Prokopek | POL | 51.29 |
| 4 | Fatou Bintou Fall | SEN | 51.87 |
| 5 | Hortense Bewouda | CMR | 52.11 |
| 6 | Oksana Luneva | KGZ | 52.94 |
| 7 | Ruwida El Hubti | LBA | 1:03.57 |
| Rank | Name | Nation | Time |
| 1 | Monique Hennagan | USA | 51.02 |
| 2 | Mariana Dimitrova | BUL | 51.29 |
| 3 | Kaltouma Nadjina | CHA | 51.50 |
| 4 | Nadia Davy | JAM | 52.04 |
| 5 | Maria Laura Almirao | BRA | 52.10 |
| 6 | Kirsi Mykkanen | FIN | 52.53 |
| 7 | Bo Fanfang | CHN | 56.01 |
| Rank | Name | Nation | Time |
| 1 | Natalya Nazarova | RUS | 50.82 |
| 2 | Donna Fraser | GBR | 51.19 |
| 3 | Hazel-Ann Regis | GRN | 51.66 |
| 4 | Estie Wittstock | RSA | 51.89 |
| 5 | Amy Mbacke Thiam | SEN | 52.44 |
| 6 | Amantle Montsho | BOT | 53.77 |
| 7 | Zamira Amirova | UZB | 54.43 |
| Rank | Name | Nation | Time |
| 1 | Natalya Antyukh | RUS | 50.54 |
| 2 | DeeDee Trotter | USA | 50.56 |
| 3 | Novlene Williams | JAM | 50.59 |
| 4 | Aliann Pompey | GUY | 51.33 |
| 5 | Egle Uljas | EST | 51.91 |
| 6 | Svetlana Bodritskaya | KAZ | 53.35 |
| 7 | Shifana Ali | MDV | 1:00.92 |
| Rank | Name | Nation | Time |
| 1 | Tonique Williams-Darling | BAH | 51.20 |
| 2 | Svetlana Usovich | BLR | 51.37 |
| 3 | Antonina Yefremova | UKR | 51.53 |
| 4 | Mireille Nguimgo | CMR | 51.90 |
| 5 | Allison Beckford | JAM | 52.85 |
| 6 | Sandrine Thiebaud-Kangni | TOG | 52.87 |
| 7 | Damayanthi Dharsha | SRI | 54.58 |
| Rank | Name | Nation | Time |
| 1 | Sanya Richards | USA | 50.11 |
| 2 | Christine Amertil | BAH | 50.23 |
| 3 | Christine Ohuruogu | GBR | 50.50 |
| 4 | Tiandra Ponteen | SKN | 51.17 |
| 5 | Geisa Coutinho | BRA | 52.18 |
| 6 | Makelesi Bulikiobo | FIJ | 53.58 |
| 7 | Salamtou Hassane | NIG | 1:03.28 |