| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS | ms* |
|---|---|---|---|---|---|---|---|
| 1 | 1 | 1 | USA | United States |
USA |
42.21 OQ | |
| 2 | 1 | 4 | GBR | Great Britain & NI |
GBR |
42.33 OQ SB | |
| 3 | 1 | 3 | GER | Germany |
GER |
42.72 OQ SB | |
| 4 | 1 | 2 | POL | Poland |
POL |
42.81 OQ SB | |
| 5 | 2 | 3 | AUS | Australia |
AUS |
42.83 OQ AR | .822 |
| 6 | 3 | 3 | CIV | Côte d’Ivoire |
CIV |
42.83 SB | .825 |
| 7 | 4 | 3 | ESP | Spain |
ESP |
42.85 SB | |
| 8 | 2 | 4 | NED | Netherlands |
NED |
42.88 OQ SB | |
| 9 | 2 | 2 | CAN | Canada |
CAN |
42.98 OQ SB | |
| 10 | 3 | 2 | CHN | PR of China |
CHN |
43.03 SB | |
| 11 | 4 | 2 | ITA | Italy |
ITA |
43.08 SB | |
| 12 | 2 | 1 | FRA | France |
FRA |
43.09 OQ | |
| 13 | 3 | 4 | LBR | Liberia |
LBR |
43.15 NR | .145 |
| 14 | 3 | 1 | NGR | Nigeria |
NGR |
43.15 | .149 |
| 15 | 4 | 4 | BAH | Bahamas |
BAH |
43.17 SB | |
| 16 | 5 | 4 | TTO | Trinidad and Tobago |
TTO |
43.22 SB | |
| 17 | 4 | 1 | SUI | Switzerland |
SUI |
43.29 | |
| 18 | 5 | 2 | JAM | Jamaica |
JAM |
43.33 SB | |
| 19 | 6 | 4 | HUN | Hungary |
HUN |
43.66 SB | |
| 20 | 5 | 3 | ECU | Ecuador |
ECU |
43.67 NR | |
| 21 | 5 | 1 | BRA | Brazil |
BRA |
43.82 SB | |
| 22 | 6 | 1 | COL | Colombia |
COL |
44.12 SB | |
| 23 | 7 | 1 | JPN | Japan |
JPN |
44.16 SB | |
| 24 | 6 | 3 | CHI | Chile |
CHI |
44.31 SB | |
| 25 | 7 | 4 | AUT | Austria |
AUT |
44.49 SB | |
| 26 | 6 | 2 | DOM | Dominican Republic |
DOM |
44.72 SB | |
| 27 | 7 | 3 | EST | Estonia |
EST |
44.81 | |
| 28 | 7 | 2 | DEN | Denmark |
DEN |
45.03 SB | |
| 4 | CUB | Cuba |
CUB |
DNF | |||
| 3 | BEL | Belgium |
BEL |
DQ |
ms - Milliseconds - shown when two or more competitors finish with the same time down to hundredths of a second