| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS | ms* |
|---|---|---|---|---|---|---|---|
| 1 | 1 | 3 | 2742 | Karsten WARHOLM |
NOR |
47.09 Q | |
| 2 | 1 | 2 | 2971 | Rai BENJAMIN |
USA |
47.24 Q | |
| 3 | 2 | 3 | 2537 | Roshawn CLARKE |
JAM |
47.34 Q WU20R | |
| 4 | 3 | 3 | 2968 | Trevor BASSITT |
USA |
47.38 q PB | .379 |
| 5 | 2 | 2 | 2113 | Alison DOS SANTOS |
BRA |
47.38 Q SB | .380 |
| 6 | 1 | 1 | 2526 | Kyron MCMASTER |
IVB |
47.72 Q | |
| 7 | 2 | 1 | 2261 | Rasmus MÄGI |
EST |
48.30 Q | |
| 8 | 4 | 3 | 2362 | Joshua ABUAKU |
GER |
48.39 q | |
| 9 | 5 | 3 | 2515 | Alessandro SIBILIO |
ITA |
48.43 | |
| 10 | 3 | 1 | 2965 | CJ ALLEN |
USA |
48.44 | |
| 11 | 3 | 2 | 2331 | Ludvy VAILLANT |
FRA |
48.48 | |
| 12 | 4 | 1 | 2546 | Jaheel HYDE |
JAM |
48.49 | |
| 13 | 4 | 2 | 2578 | Kazuki KUROKAWA |
JPN |
48.58 PB | |
| 14 | 6 | 3 | 2929 | Yasmani COPELLO |
TUR |
48.66 SB | |
| 15 | 5 | 2 | 2363 | Emil AGYEKUM |
GER |
48.71 PB | |
| 16 | 7 | 3 | 2310 | Wilfried HAPPIO |
FRA |
48.83 | |
| 17 | 5 | 1 | 2090 | Julien WATRIN |
BEL |
48.94 | |
| 18 | 6 | 1 | 2721 | Ezekiel NATHANIEL |
NGR |
49.22 | |
| 19 | 8 | 3 | 2189 | Gerald DRUMMOND |
CRC |
49.31 | |
| 20 | 6 | 2 | 2623 | Wiseman Were MUKHOBE |
KEN |
49.40 | |
| 21 | 7 | 1 | 2813 | Bassem HEMEIDA |
QAT |
49.50 | |
| 22 | 7 | 2 | 2171 | Zhiyu XIE |
CHN |
49.57 | |
| 23 | 8 | 2 | 2867 | Julien BONVIN |
SUI |
49.75 | |
| 1 | 2504 | Mario LAMBRUGHI |
ITA |
DQ |
ms - Milliseconds - shown when two or more competitors finish with the same time down to hundredths of a second