| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS | ms* |
|---|---|---|---|---|---|---|---|
| 1 | 1 | 2 | USA | United States |
USA |
41.56 Q WL | |
| 2 | 1 | 1 | GBR | Great Britain & NI |
GBR |
41.99 Q WL | |
| 3 | 2 | 1 | JAM | Jamaica |
JAM |
42.37 Q SB | |
| 4 | 3 | 1 | GER | Germany |
GER |
42.44 Q SB | |
| 5 | 2 | 2 | ESP | Spain |
ESP |
42.61 Q NR | |
| 6 | 3 | 2 | NGR | Nigeria |
NGR |
42.68 Q SB | |
| 7 | 4 | 2 | ITA | Italy |
ITA |
42.71 q NR | |
| 8 | 5 | 2 | SUI | Switzerland |
SUI |
42.73 q | |
| 9 | 4 | 1 | CHN | PR of China |
CHN |
42.93 SB | |
| 10 | 5 | 1 | CAN | Canada |
CAN |
43.09 | |
| 11 | 6 | 1 | POL | Poland |
POL |
43.19 SB | |
| 12 | 7 | 1 | JPN | Japan |
JPN |
43.33 NR | |
| 13 | 6 | 2 | NED | Netherlands |
NED |
43.46 | .458 |
| 13 | 6 | 2 | DEN | Denmark |
DEN |
43.46 NR | .458 |
| 15 | 8 | 2 | ECU | Ecuador |
ECU |
44.17 SB | |
| 16 | 8 | 1 | IRL | Ireland |
IRL |
44.48 |
ms - Milliseconds - shown when two or more competitors finish with the same time down to hundredths of a second