| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS |
|---|---|---|---|---|---|---|
| 1 | 1 | 1 | JAM | Jamaica |
JAM |
42.50 Q WL |
| 2 | 1 | 2 | USA | United States |
USA |
42.63 Q SB |
| 3 | 2 | 2 | TTO | Trinidad and Tobago |
TTO |
42.87 Q SB |
| 4 | 1 | 3 | BRA | Brazil |
BRA |
42.94 Q SB |
| 4 | 2 | 1 | CAN | Canada |
CAN |
42.94 Q SB |
| 5 | 3 | 1 | NGR | Nigeria |
NGR |
43.56 q SB |
| 6 | 2 | 3 | GBR | Great Britain & NI |
GBR |
43.60 Q SB |
| 7 | 3 | 3 | SUI | Switzerland |
SUI |
43.68 q SB |
| 8 | 4 | 1 | BAH | Bahamas |
BAH |
44.11 SB |
| 9 | 4 | 3 | ECU | Ecuador |
ECU |
44.24 SB |
| 10 | 5 | 3 | KAZ | Kazakhstan |
KAZ |
44.27 SB |
| 11 | 3 | 2 | PUR | Puerto Rico |
PUR |
44.35 SB |
| 12 | 4 | 2 | VEN | Venezuela |
VEN |
44.42 SB |
| 13 | 5 | 2 | CHN | PR of China |
CHN |
44.45 SB |
| 14 | 6 | 2 | SWE | Sweden |
SWE |
44.81 SB |
| 15 | 6 | 3 | AUS | Australia |
AUS |
45.17 |
| 16 | 5 | 1 | IRL | Ireland |
IRL |
45.38 SB |
| 1 | GER | Germany |
GER |
DNF | ||
| 1 | POL | Poland |
POL |
DNF | ||
| 2 | ITA | Italy |
ITA |
DNF | ||
| 3 | FRA | France |
FRA |
DNF | ||
| 3 | JPN | Japan |
JPN |
DQ R170.7 |