| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS | ms* |
|---|---|---|---|---|---|---|---|
| 1 | 1 | 1 | 1102 | Karsten WARHOLM |
NOR |
47.67 Q | |
| 2 | 2 | 1 | 646 | Clement DUCOS |
FRA |
47.85 Q | .843 |
| 3 | 1 | 3 | 1293 | Rai BENJAMIN |
USA |
47.85 Q | .847 |
| 4 | 3 | 1 | 423 | Alison DOS SANTOS |
BRA |
47.95 q | |
| 5 | 1 | 2 | 884 | Kyron MCMASTER |
IVB |
48.15 Q | |
| 6 | 2 | 2 | 609 | Rasmus MÄGI |
EST |
48.16 Q | |
| 7 | 3 | 2 | 1169 | Abderrahman SAMBA |
QAT |
48.20 q | |
| 8 | 4 | 1 | 1291 | Trevor BASSITT |
USA |
48.29 | |
| 9 | 2 | 3 | 893 | Roshawn CLARKE |
JAM |
48.34 Q | |
| 10 | 4 | 2 | 1288 | CJ ALLEN |
USA |
48.44 | |
| 11 | 5 | 1 | 1078 | Ezekiel NATHANIEL |
NGR |
48.65 | |
| 12 | 3 | 3 | 654 | Wilfried HAPPIO |
FRA |
48.66 | |
| 13 | 5 | 2 | 732 | Emil AGYEKUM |
GER |
48.78 | |
| 14 | 6 | 2 | 868 | Alessandro SIBILIO |
ITA |
48.79 | |
| 15 | 7 | 2 | 902 | Malik JAMES-KING |
JAM |
48.85 | |
| 16 | 4 | 3 | 430 | Matheus LIMA |
BRA |
49.08 | |
| 17 | 8 | 2 | 1262 | Berke AKÇAM |
TUR |
49.12 | |
| 18 | 5 | 3 | 981 | Wiseman Were MUKHOBE |
KEN |
49.22 | |
| 19 | 6 | 3 | 1231 | Carl BENGTSTRÖM |
SWE |
49.56 | |
| 20 | 6 | 1 | 1062 | Nick SMIDT |
NED |
49.61 | |
| 21 | 7 | 3 | 524 | Gerald DRUMMOND |
CRC |
49.68 | |
| 22 | 7 | 1 | 901 | Jaheel HYDE |
JAM |
50.03 | |
| 23 | 8 | 1 | 731 | Joshua ABUAKU |
GER |
50.19 | |
| 24 | 8 | 3 | 694 | Alastair CHALMERS |
GBR |
56.52 |
ms - Milliseconds - shown when two or more competitors finish with the same time down to hundredths of a second