| POS | ATHLETE | COUNTRY | MARK | Reaction Time |
|---|---|---|---|---|
| 1 | Christine Ohuruogu |
GBR
|
50.14 Q SB | 0.233 |
| 2 | Shericka Williams |
JAM
|
50.28 Q SB | 0.240 |
| 3 | Aliann Pompey |
GUY
|
50.93 =NR | 0.194 |
| 4 | Mary Wineberg |
USA
|
51.13 | 0.203 |
| 5 | Indira Terrero |
CUB
|
51.80 | 0.367 |
| 6 | Muizat Ajoke Odumosu |
NGR
|
52.45 | 0.387 |
| 7 | Gabriela Medina |
MEX
|
52.97 | 0.250 |
| Tatyana Firova |
RUS
|
DQ | 0.246 |
| POS | ATHLETE | COUNTRY | MARK | Reaction Time |
|---|---|---|---|---|
| 1 | Sanya Richards-Ross |
USA
|
49.90 Q | 0.190 |
| 2 | Novlene Williams-Mills |
JAM
|
51.06 | 0.255 |
| 3 | Christine Amertil |
BAH
|
51.51 | 0.222 |
| 4 | Joy Eze |
NGR
|
51.87 | 0.375 |
| 5 | Lee McConnell |
GBR
|
52.11 | 0.243 |
| 6 | Carline Muir |
CAN
|
52.37 | 0.399 |
| 7 | Racheal Nachula |
ZAM
|
52.67 | 0.223 |
| Anastasiya Kapachinskaya |
RUS
|
DQ | 0.249 |
| POS | ATHLETE | COUNTRY | MARK | Reaction Time |
|---|---|---|---|---|
| 1 | Yuliya Gushchina |
RUS
|
50.48 Q | 0.189 |
| 2 | Amantle MONTSHO |
BOT
|
50.54 Q | 0.226 |
| 3 | Rosemarie Whyte |
JAM
|
50.63 q | 0.190 |
| 4 | Nicola Sanders |
GBR
|
50.71 SB | 0.197 |
| 5 | Libania Grenot |
ITA
|
50.83 NR | 0.233 |
| 6 | Folasade Abugan |
NGR
|
51.30 | 0.343 |
| 7 | Deedee Trotter |
USA
|
51.87 | 0.235 |
| 8 | Nawal El Jack |
SUD
|
54.18 |