| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Rosemarie Whyte |  JAM | 51.00 Q | 0.207 | 
| 2 | Christine Amertil |  BAH | 51.25 Q SB | 0.189 | 
| 3 | Muizat Ajoke Odumosu |  NGR | 51.39 Q PB | 0.214 | 
| 4 | Deedee Trotter |  USA | 51.41 q | 0.256 | 
| 5 | Tiandra Ponteen |  SKN | 52.41 | 0.437 | 
| 6 | Antonina Yefremova |  UKR | 53.22 | 0.204 | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Libania Grenot |  ITA | 50.87 Q NR | 0.330 | 
| 2 | Amantle MONTSHO |  BOT | 50.91 Q | 0.271 | 
| 3 | Carline Muir |  CAN | 51.55 Q PB | 0.253 | 
| 4 | Indira Terrero |  CUB | 51.56 q | 0.396 | 
| 5 | Makelesi Batimala |  FIJ | 52.24 SB | 0.216 | 
| 6 | Mandeep Kaur |  IND | 52.88 | 0.348 | 
| 7 | Justine Bayigga |  UGA | 54.15 | 0.325 | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Mary Wineberg |  USA | 51.46 Q | 0.197 | 
| 2 | Lee McConnell |  GBR | 51.87 Q | 0.240 | 
| 3 | Barbara Petráhn |  HUN | 53.06 | 0.202 | 
| 4 | Carol RodrÃguez |  PUR | 53.08 | 0.183 | 
| 5 | Ginou Etienne |  HAI | 53.94 | 0.322 | 
| 6 | Rachidatou Seini Maikido |  NIG | 1:03.19 NR | |
| Anastasiya Kapachinskaya |  RUS | DQ | 0.264 | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Christine Ohuruogu |  GBR | 51.00 Q | 0.271 | 
| 2 | Yuliya Gushchina |  RUS | 51.18 Q | 0.257 | 
| 3 | Gabriela Medina |  MEX | 51.96 Q | 0.261 | 
| 4 | Tamsyn Manou |  AUS | 52.38 | 0.187 | 
| 5 | Maria Laura Almirão |  BRA | 53.26 | |
| 6 | Joanne Cuddihy |  IRL | 53.32 | 0.196 | 
| 7 | Ghada Ali |  LBA | 1:06.19 | 0.289 | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Sanya Richards-Ross |  USA | 50.54 Q | 0.207 | 
| 2 | Aliann Pompey |  GUY | 50.99 Q SB | 0.225 | 
| 3 | Folasade Abugan |  NGR | 51.45 Q | 0.276 | 
| 4 | Asami Chiba |  JPN | 52.60 | 0.231 | 
| 5 | DÃmitra Dóva |  GRE | 52.69 | 0.219 | 
| 6 | Olga Tereshkova Tsykunova |  KAZ | 53.36 | 0.217 | 
| 7 | Kia Davis |  LBR | 53.99 | 0.307 | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Novlene Williams-Mills |  JAM | 51.52 Q | 0.202 | 
| 2 | Nicola Sanders |  GBR | 51.81 Q | 0.279 | 
| 3 | Nawal El Jack |  SUD | 52.77 Q | 0.494 | 
| 4 | Kineke Alexander |  VIN | 52.87 | 0.266 | 
| 5 | Trish Bartholomew |  GRN | 52.88 | 0.162 | 
| 6 | Tsholofelo Thipe |  RSA | 54.11 | 0.217 | 
| 7 | Klodiana Shala |  ALB | 54.84 | 0.147 | 
| 8 | Munguntuya Batgerel |  MGL | 58.14 | 0.247 | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Shericka Williams |  JAM | 50.57 Q | 0.242 | 
| 2 | Racheal Nachula |  ZAM | 51.62 Q | 0.239 | 
| 3 | Joy Eze |  NGR | 51.97 q | 0.385 | 
| 4 | Monika Bejnar |  POL | 52.80 | 0.264 | 
| 5 | Sandrine Thiébaud-Kangni |  TOG | 54.16 | 0.248 | 
| 6 | Temalangeni Dlamini |  SWZ | 59.91 | 0.278 | 
| Tatyana Firova |  RUS | DQ | 0.245 | |
| Alissa Kallinikou |  CYP | DQ | 0.259 |