| POS | BIB | Team | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | USA | United States |  USA | 42.29 Q CR | 0.171 | 
| 2 | TTO | Trinidad and Tobago |  TTO | 42.59 Q SB | 0.188 | 
| 3 | GER | Germany |  GER | 42.92 q SB | 0.175 | 
| 4 | SUI | Switzerland |  SUI | 43.41 SB | 0.184 | 
| 5 | DOM | Dominican Republic |  DOM | 44.30 SB | 0.143 | 
| 6 | AUS | Australia |  AUS | 44.69 | 0.151 | 
| Split | Mark | Athlete | COUNTRY | 
|---|---|---|---|
| 300m | 31.80 |  United States |  USA | 
| POS | BIB | Team | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | JAM | Jamaica |  JAM | 42.29 Q CR | 0.182 | 
| 2 | NGR | Nigeria |  NGR | 42.77 Q SB | 0.155 | 
| 3 | BRA | Brazil |  BRA | 43.22 q SB | 0.195 | 
| 4 | CAN | Canada |  CAN | 43.69 SB | 0.206 | 
| 5 | CHN | PR of China |  CHN | 44.12 SB | 0.149 | 
| 6 | IVB | British Virgin Islands |  IVB | 44.53 SB | 0.186 | 
| 7 | VEN | Venezuela |  VEN | 44.64 SB | 0.236 | 
| Split | Mark | Athlete | COUNTRY | 
|---|---|---|---|
| 300m | 32.00 |  Jamaica |  JAM | 
| POS | BIB | Team | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | GBR | Great Britain & NI |  GBR | 43.20 Q | 0.154 | 
| 2 | FRA | France |  FRA | 43.35 Q SB | 0.191 | 
| 3 | BAH | Bahamas |  BAH | 43.54 SB | 0.152 | 
| 4 | PUR | Puerto Rico |  PUR | 44.04 SB | 0.182 | 
| 5 | POL | Poland |  POL | 44.07 SB | 0.210 | 
| 6 | JPN | Japan |  JPN | 44.66 | 0.148 | 
| Split | Mark | Athlete | COUNTRY | 
|---|---|---|---|
| 300m | 32.80 |  Great Britain & N.I. |  GBR |