| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time |
|---|---|---|---|---|---|
| 1 | 819 | Sanya Richards-Ross |
USA
|
50.05 Q | 0.203 |
| 2 | 684 | Amy Mbacke Thiam |
SEN
|
50.83 Q SB | 0.278 |
| 3 | 615 | Natalya Antyukh |
RUS
|
50.99 | 0.177 |
| 4 | 696 | Nawal El Jack |
SUD
|
51.85 | 0.213 |
| 5 | 686 | Tiandra Ponteen |
SKN
|
51.88 | 0.183 |
| 6 | 413 | Shericka Williams |
JAM
|
52.44 | 0.198 |
| 7 | 266 | Donna Fraser |
GBR
|
52.48 | 0.190 |
| 8 | 45 | Anna Kozak |
BLR
|
52.73 | 0.195 |
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time |
|---|---|---|---|---|---|
| 1 | 653 | Svetlana Pospelova |
RUS
|
50.34 Q | 0.152 |
| 2 | 834 | Deedee Trotter |
USA
|
50.73 Q | 0.307 |
| 3 | 18 | Christine Amertil |
BAH
|
51.03 | 0.181 |
| 4 | 277 | Christine Ohuruogu |
GBR
|
51.43 | 0.215 |
| 5 | 401 | Lorraine Fenton |
JAM
|
51.48 | 0.192 |
| 6 | 106 | Kaltouma Nadjina |
CHA
|
52.07 | 0.176 |
| 7 | 680 | Fatou Bintou Fall |
SEN
|
52.35 | 0.356 |
| 8 | 548 | Anna Guzowska |
POL
|
52.45 | 0.169 |
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time |
|---|---|---|---|---|---|
| 1 | 27 | Tonique Williams-Darling |
BAH
|
49.69 Q SB | 0.176 |
| 2 | 493 | Ana Guevara |
MEX
|
50.33 Q | 0.169 |
| 3 | 657 | Olesya Zykina |
RUS
|
50.73 q SB | 0.167 |
| 4 | 799 | Monique Henderson |
USA
|
50.73 q | 0.193 |
| 5 | 48 | Ilona Usovich |
BLR
|
50.96 PB | 0.190 |
| 6 | 274 | Lee McConnell |
GBR
|
51.15 SB | 0.249 |
| 7 | 71 | Lucimar Teodoro |
BRA
|
51.98 | 0.159 |
| 8 | 364 | Karen Shinkins |
IRL
|
52.17 | 0.153 |