| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS |
|---|---|---|---|---|---|---|
| 1 | 1 | 1 | 2410 | Michael NORMAN |
USA |
44.30 Q |
| 2 | 2 | 1 | 1874 | Matthew HUDSON-SMITH |
GBR |
44.38 Q |
| 3 | 1 | 3 | 2351 | Champion ALLISON |
USA |
44.71 Q |
| 4 | 1 | 2 | 1945 | Kirani JAMES |
GRN |
44.74 Q |
| 5 | 2 | 3 | 2268 | Wayde VAN NIEKERK |
RSA |
44.75 Q |
| 6 | 3 | 3 | 1566 | Jonathan JONES |
BAR |
44.78 q |
| 7 | 2 | 2 | 1595 | Bayapo NDORI |
BOT |
44.94 Q |
| 8 | 3 | 1 | 2041 | Christopher TAYLOR |
JAM |
44.97 q SB |
| 9 | 3 | 2 | 2437 | Muzala SAMUKONGA |
ZAM |
45.02 PB |
| 10 | 4 | 3 | 1872 | Alex HAYDOCK-WILSON |
GBR |
45.08 PB |
| 11 | 4 | 1 | 2264 | Zakithi NENE |
RSA |
45.24 |
| 12 | 5 | 3 | 1572 | Kévin BORLÉE |
BEL |
45.26 |
| 13 | 4 | 2 | 2366 | Michael CHERRY |
USA |
45.28 |
| 14 | 5 | 1 | 1571 | Dylan BORLÉE |
BEL |
45.41 |
| 15 | 6 | 3 | 2159 | Liemarvin BONEVACIA |
NED |
45.50 |
| 16 | 7 | 3 | 2080 | Mikhail LITVIN |
KAZ |
45.63 SB |
| 17 | 5 | 2 | 2069 | Fuga SATO |
JPN |
45.71 |
| 18 | 6 | 1 | 2075 | Julian Jrummi WALSH |
JPN |
45.75 |
| 19 | 6 | 2 | 1579 | Alexander DOOM |
BEL |
45.80 |
| 20 | 7 | 2 | 1979 | Christopher O'DONNELL |
IRL |
46.01 |
| 21 | 8 | 3 | 1594 | Isaac MAKWALA |
BOT |
46.04 |
| 22 | 7 | 1 | 1736 | Lidio Andres FELIZ |
DOM |
46.19 |
| 23 | 8 | 1 | 1526 | Alex BECK |
AUS |
46.21 |
| 2 | 2014 | Nathon ALLEN |
JAM |
DNF |