| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS | ms* |
|---|---|---|---|---|---|---|---|
| 1 | 1 | 2 | 202 | Óscar HUSILLOS |
ESP |
45.69 Q NIR | |
| 2 | 2 | 2 | 407 | Michael CHERRY |
USA |
45.73 Q | |
| 3 | 1 | 1 | 188 | Luguelín SANTOS |
DOM |
46.31 Q SB | |
| 4 | 1 | 3 | 173 | Pavel MASLÁK |
CZE |
46.32 Q | |
| 5 | 2 | 1 | 401 | Aldrich BAILEY JR |
USA |
46.33 Q | .327 |
| 6 | 2 | 3 | 386 | Deon LENDORE |
TTO |
46.33 Q | .330 |
| 7 | 3 | 3 | 365 | Luka JANEŽIČ |
SLO |
46.37 | |
| 8 | 3 | 2 | 344 | Rafał Omelko |
POL |
46.39 | |
| 9 | 3 | 1 | 339 | Jakub KRZEWINA |
POL |
46.69 | |
| 10 | 4 | 1 | 281 | Javon FRANCIS |
JAM |
46.73 | |
| 11 | 4 | 2 | 189 | Juander SANTOS |
DOM |
46.83 PB | |
| 12 | 5 | 2 | 385 | Asa GUEVARA |
TTO |
46.91 | |
| 13 | 5 | 1 | 172 | Patrik ŠORM |
CZE |
47.04 | |
| 14 | 6 | 2 | 231 | Lee THOMPSON |
GBR |
47.14 | .136 |
| 15 | 6 | 1 | 197 | Lucas BÚA |
ESP |
47.14 | .140 |
| 16 | 4 | 3 | 293 | Mikhail LITVIN |
KAZ |
47.94 | |
| 17 | 5 | 3 | 324 | Chidi OKEZIE |
NGR |
48.53 | |
| 3 | 304 | Yousef KARAM |
KUW |
DNF |
ms - Milliseconds - shown when two or more competitors finish with the same time down to hundredths of a second