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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Christine Ohuruogu | GBR | 50.14 |
| 2 | Shericka Williams | JAM | 50.28 |
| 3 | Tatiana Firova | RUS | 50.31 |
| 4 | Aliann Pompey | GUY | 50.93 |
| 5 | Mary Wineberg | USA | 51.13 |
| 6 | Indira Terrero | CUB | 51.80 |
| 7 | Ajoke Odumosu | NGR | 52.45 |
| 8 | Gabriela Medina | MEX | 52.97 |
| Rank | Name | Nation | Time |
| 1 | Sanya Richards | USA | 49.90 |
| 2 | Anastasiya Kapachinskaya | RUS | 50.30 |
| 3 | Novlene Williams | JAM | 51.06 |
| 4 | Christine Amertil | BAH | 51.51 |
| 5 | Joy Amechi Eze | NGR | 51.87 |
| 6 | Lee McConnell | GBR | 52.11 |
| 7 | Carline Muir | CAN | 52.37 |
| 8 | Rachael Nachula | ZAM | 52.67 |
| Rank | Name | Nation | Time |
| 1 | Yuliya Gushchina | RUS | 50.48 |
| 2 | Amantle Montsho | BOT | 50.54 |
| 3 | Rosemarie Whyte | JAM | 50.63 |
| 4 | Nicola Sanders | GBR | 50.71 |
| 5 | Libania Grenot | ITA | 50.83 |
| 6 | Folashade Abugan | NGR | 51.30 |
| 7 | DeeDee Trotter | USA | 51.87 |
| 8 | Nwal Eljack | SUD | 54.18 |