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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Sheena Tosta | USA | 54.07 |
| 2 | Tasha Danvers | GBR | 54.31 |
| 3 | Anna Jesien | POL | 54.36 |
| 4 | Yekaterina Bikert | RUS | 54.38 |
| 5 | Nickiesha Wilson | JAM | 54.67 |
| 6 | Anastasia Ott | RUS | 54.74 |
| 7 | Satomi Kubokura | JPN | 56.69 |
| 8 | Angela Morosanu | ROU | 57.67 |
| Rank | Name | Nation | Time |
| 1 | Melaine Walker | JAM | 54.20 |
| 2 | Anastasiya Rabchenyuk | UKR | 54.60 |
| 3 | Tiffany Ross-Williams | USA | 54.99 |
| 4 | Zuzana Hejnova | CZE | 55.17 |
| 5 | Aissata Soulama | BUR | 55.69 |
| 6 | Irina Obedina | RUS | 55.69 |
| 7 | Queen Harrison | USA | 55.88 |
| 8 | Cvetelina Kirilova | BUL | 55.97 |