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Summary
| Rank | Name | Nation | Time |
| 1 | Tonique Williams-Darling | BAH | 49.41 |
| 2 | Ana Guevara | MEX | 49.56 |
| 3 | Natalya Antyukh | RUS | 49.89 |
| 4 | Monique Hennagan | USA | 49.97 |
| 5 | DeeDee Trotter | USA | 50.00 |
| 6 | Sanya Richards | USA | 50.19 |
| 7 | Christine Amertil | BAH | 50.37 |
| 8 | Natalya Nazarova | RUS | 50.65 |