| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS |
|---|---|---|---|---|---|---|
| 1 | 1 | 1 | 358 | Christopher TAYLOR |
JAM |
45.30 Q WYL |
| 2 | 2 | 1 | 628 | Josephus LYLES |
USA |
45.93 Q |
| 3 | 3 | 1 | 54 | Karabo SIBANDA |
BOT |
46.53 q |
| 4 | 1 | 3 | 140 | Anthony José ZAMBRANO |
COL |
46.76 Q |
| 5 | 1 | 2 | 633 | Keshun Reed |
USA |
46.77 Q |
| 6 | 2 | 2 | 23 | Louis Stenmark |
AUS |
46.78 Q PB |
| 7 | 4 | 1 | 374 | Manato Sasaki |
JPN |
46.85 q PB |
| 8 | 2 | 3 | 91 | Jamal Walton |
CAY |
46.97 Q |
| 9 | 3 | 3 | 243 | Loïc PREVOT |
FRA |
47.03 |
| 10 | 3 | 2 | 310 | Chandan Bauri |
IND |
47.41 |
| 11 | 5 | 1 | 114 | Haoran Xu |
CHN |
47.44 PB |
| 12 | 6 | 1 | 490 | Tymoteusz ZIMNY |
POL |
47.53 PB |
| 13 | 4 | 2 | 365 | Ryota Kitahara |
JPN |
47.85 |
| 14 | 5 | 2 | 277 | Marvin SCHLEGEL |
GER |
47.92 |
| 15 | 4 | 3 | 112 | Yu Ang WU |
CHN |
48.11 |
| 16 | 7 | 1 | 515 | André Nikolas Marich |
RSA |
48.34 |
| 17 | 6 | 2 | 330 | Vladimir ACETI |
ITA |
48.59 |
| 17 | 5 | 3 | 441 | Roger Ordaz |
MEX |
48.59 |
| 19 | 6 | 3 | 265 | Florian Colon Marti |
GER |
48.84 |
| 20 | 7 | 2 | 442 | Edgar RAMÍREZ |
MEX |
49.01 |
| 21 | 7 | 3 | 388 | Edwin Ngeeti |
KEN |
49.26 |
| 22 | 8 | 2 | 389 | Josphat Kipngetich Ngeno |
KEN |
49.86 |
| 23 | 8 | 1 | 543 | Anej Zupanc |
SLO |
49.93 |
| 3 | 558 | Miquel Shepper |
SUR |
DQ R163.3(a) |