| Order / Lane | Bib | ATHLETE | COUNTRY | PB | SB 2012 |
|---|---|---|---|---|---|
| 2 | 2213 | Novlene Williams-Mills |
JAM
|
49.63 | 49.78 |
| 3 | 2209 | Rosemarie Whyte |
JAM
|
49.84 | 50.62 |
| 4 | 3321 | Deedee Trotter |
USA
|
49.64 | 49.87 |
| 5 | 2873 | Antonina Krivoshapka |
RUS
|
49.16 | 49.16 |
| 6 | 3313 | Sanya Richards-Ross |
USA
|
48.70 | 49.28 |
| 7 | 1214 | Amantle MONTSHO |
BOT
|
49.54 | 49.54 |
| 8 | 1866 | Christine Ohuruogu |
GBR
|
49.61 | 50.22 |
| 9 | 3307 | Francena McCorory |
USA
|
50.06 | 50.06 |