| POS | ATHLETE | COUNTRY | MARK | Reaction Time |
|---|---|---|---|---|
| 1 | Ana Guevara |
MEX
|
50.15 Q | 0.273 |
| 2 | Christine Amertil |
BAH
|
50.17 Q PB | 0.331 |
| 3 | Sanya Richards-Ross |
USA
|
50.54 q | 0.308 |
| 4 | Christine Ohuruogu |
GBR
|
51.00 | 0.236 |
| 5 | Tiandra Ponteen |
SKN
|
51.33 | 0.290 |
| 6 | Sviatlana Usovich |
BLR
|
51.42 | 0.432 |
| 7 | Hazel Regis-Buckels |
GRN
|
51.47 | 0.375 |
| 8 | Egle Uljas |
EST
|
53.13 | 0.436 |
| POS | ATHLETE | COUNTRY | MARK | Reaction Time |
|---|---|---|---|---|
| 1 | Tonique Williams-Darling |
BAH
|
50.00 Q | 0.271 |
| 2 | Deedee Trotter |
USA
|
50.14 Q PB | 0.258 |
| 3 | Natalya Nazarova |
RUS
|
50.63 q | 0.221 |
| 4 | Fatou Bintou Fall |
SEN
|
51.21 | 0.325 |
| 5 | Kaltouma Nadjina |
CHA
|
51.57 | 0.306 |
| 6 | Estie Wittstock |
RSA
|
51.77 | 0.218 |
| 7 | Donna Fraser |
GBR
|
51.94 | 0.207 |
| 8 | Grazyna Prokopek |
POL
|
51.96 | 0.355 |
| POS | ATHLETE | COUNTRY | MARK | Reaction Time |
|---|---|---|---|---|
| 1 | Monique Hennagan |
USA
|
49.88 Q | 0.278 |
| 2 | Natalya Antyukh |
RUS
|
50.04 Q | 0.246 |
| 3 | Novlene Williams-Mills |
JAM
|
50.85 | 0.231 |
| 4 | Mariyana Dimitrova |
BUL
|
51.20 =PB | 0.257 |
| 5 | Aliann Pompey |
GUY
|
51.61 | 0.322 |
| 6 | Antonina Yefremova |
UKR
|
51.90 | |
| 7 | Mireille Nguimgo |
CMR
|
52.21 | 0.304 |
| 8 | Lee McConnell |
GBR
|
52.63 | 0.263 |