| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time |
|---|---|---|---|---|---|
| 1 | 138 | Sanya Richards-Ross |
USA
|
49.25 CR | 0.187 |
| 2 | 66 | Novlene Williams-Mills |
JAM
|
50.36 | 0.222 |
| 3 | 67 | Shericka Williams |
JAM
|
50.44 | 0.238 |
| 4 | 143 | Deedee Trotter |
USA
|
50.58 | 0.328 |
| 5 | 8 | Christine Amertil |
BAH
|
50.79 | 0.185 |
| 6 | 109 | Amy Mbacke Thiam |
SEN
|
51.16 | 0.182 |
| 7 | 132 | Monique Henderson |
USA
|
51.30 | 0.201 |
| 8 | 19 | Vania Stambolova |
BUL
|
51.48 | 0.210 |