| Order / Lane | Bib | ATHLETE | COUNTRY | PB | SB 2007 | 
|---|---|---|---|---|---|
| 2 | 362 | Indira Terrero |  CUB | 51.00 | 51.00 | 
| 3 | 609 | Asami Chiba |  JPN | 51.80 | 52.13 | 
| 4 | 677 | Ana Guevara |  MEX | 48.89 | 50.34 | 
| 5 | 968 | Natasha Hastings |  USA | 49.84 | 49.84 | 
| 6 | 590 | Novlene Williams-Mills |  JAM | 49.63 | 50.06 | 
| 7 | 259 | Ilona Usovich |  BLR | 50.53 | 50.53 | 
| 8 | 556 | Joanne Cuddihy |  IRL | 51.09 | 51.55 | 
| 9 | 473 | Lee McConnell |  GBR | 50.82 | 51.44 | 
| Order / Lane | Bib | ATHLETE | COUNTRY | PB | SB 2007 | 
|---|---|---|---|---|---|
| 2 | 542 | Barbara Petráhn |  HUN | 51.50 | 51.86 | 
| 3 | 229 | Christine Amertil |  BAH | 50.09 | 50.99 | 
| 4 | 592 | Shericka Williams |  JAM | 50.24 | 51.02 | 
| 5 | 793 | Natalya Antyukh |  RUS | 49.85 | 50.10 | 
| 6 | 1003 | Deedee Trotter |  USA | 49.64 | 49.64 | 
| 7 | 474 | Nicola Sanders |  GBR | 50.02i | 50.02i | 
| 8 | 570 | Daniela Reina |  ITA | 51.18 | 52.02 | 
| 9 | 535 | Aliann Pompey |  GUY | 50.93 | 51.61 | 
| Order / Lane | Bib | ATHLETE | COUNTRY | PB | SB 2007 | 
|---|---|---|---|---|---|
| 2 | 703 | Christy Ekpukhon Ihunaegbo |  NGR | 51.11 | 51.11 | 
| 3 | 360 | Aymeé MartÃnez |  CUB | 51.74 | 51.74 | 
| 4 | 477 | Christine Ohuruogu |  GBR | 50.28 | 50.46 | 
| 5 | 1006 | Mary Wineberg |  USA | 50.24 | 50.24 | 
| 6 | 839 | Tatyana Veshkurova |  RUS | 49.99 | 50.22 | 
| 7 | 589 | Shereefa Lloyd |  JAM | 51.02 | 51.02 | 
| 8 | 267 | Amantle MONTSHO |  BOT | 51.13 | 51.13 | 
| 9 | 779 | Ionela Târlea |  ROU | 49.88 | 51.59 |