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Summary
Heat 1
| Rank | Name | Nation | Time |
| 1 | Rosemarie Whyte | JAM | 51.00 |
| 2 | Christine Amertil | BAH | 51.25 |
| 3 | Ajoke Odumosu | NGR | 51.39 |
| 4 | DeeDee Trotter | USA | 51.41 |
| 5 | Tiandra Ponteen | SKN | 52.41 |
| 6 | Antonina Yefremova | UKR | 53.22 |
| Rank | Name | Nation | Time |
| 1 | Libania Grenot | ITA | 50.87 |
| 2 | Amantle Montsho | BOT | 50.91 |
| 3 | Carline Muir | CAN | 51.55 |
| 4 | Indira Terrero | CUB | 51.56 |
| 5 | Makelesi Bulikiobo | FIJ | 52.24 |
| 6 | Mandeep Kaur | IND | 52.88 |
| 7 | Justine Bayigga | UGA | 54.15 |
| Rank | Name | Nation | Time |
| 1 | Anastasiya Kapachinskaya | RUS | 51.32 |
| 2 | Mary Wineberg | USA | 51.46 |
| 3 | Lee McConnell | GBR | 51.87 |
| 4 | Barbara Petrahn | HUN | 53.06 |
| 5 | Carol Rodriguez | PUR | 53.08 |
| 6 | Ginou Etienne | HAI | 53.94 |
| 7 | Rachidatou Seini Maikido | NIG | 1:03.19 |
| Rank | Name | Nation | Time |
| 1 | Christine Ohuruogu | GBR | 51.00 |
| 2 | Yuliya Gushchina | RUS | 51.18 |
| 3 | Gabriela Medina | MEX | 51.96 |
| 4 | Tamsyn Lewis | AUS | 52.38 |
| 5 | Maria Laura Almirao | BRA | 53.26 |
| 6 | Joanne Cuddihy | IRL | 53.32 |
| 7 | Ghada Ali | LBA | 1:06.19 |
| Rank | Name | Nation | Time |
| 1 | Sanya Richards | USA | 50.54 |
| 2 | Aliann Pompey | GUY | 50.99 |
| 3 | Folashade Abugan | NGR | 51.45 |
| 4 | Asami Tanno | JPN | 52.60 |
| 5 | Dimitra Ntova | GRE | 52.69 |
| 6 | Olga Tereshkova | KAZ | 53.36 |
| 7 | Kia Davis | LBR | 53.99 |
| Rank | Name | Nation | Time |
| 1 | Novlene Williams | JAM | 51.52 |
| 2 | Nicola Sanders | GBR | 51.81 |
| 3 | Nwal Eljack | SUD | 52.77 |
| 4 | Kineke Alexander | VIN | 52.87 |
| 5 | Trish Bartholomew | GRN | 52.88 |
| 6 | Tsholofelo Thipe | RSA | 54.11 |
| 7 | Klodiana Shala | ALB | 54.84 |
| 8 | Munguntuya Batgerel | MGL | 58.14 |
| Rank | Name | Nation | Time |
| 1 | Shericka Williams | JAM | 50.57 |
| 2 | Tatiana Firova | RUS | 50.59 |
| 3 | Rachael Nachula | ZAM | 51.62 |
| 5 | Alissa Kallinikou | CYP | 52.40 |
| 6 | Monika Bejnar | POL | 52.80 |
| 7 | Sandrine Thiebaud-Kangni | TOG | 54.16 |
| 8 | Temalangeni Dlamini | SWZ | 59.91 |
| Rank | Name | Nation | Time |
| 4 | Joy Amechi Eze | NGR | 51.97 |