| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS |
|---|---|---|---|---|---|---|
| 1 | 1 | 1 | 2539 | Kirani JAMES |
GRN |
44.02 Q SB |
| 2 | 2 | 1 | 3090 | LaShawn Merritt |
USA |
44.21 Q |
| 3 | 1 | 2 | 2977 | Machel CEDENIO |
TTO |
44.39 Q |
| 4 | 1 | 3 | 2540 | Bralon TAPLIN |
GRN |
44.44 Q |
| 5 | 2 | 2 | 2910 | Wayde VAN NIEKERK |
RSA |
44.45 Q |
| 6 | 3 | 1 | 2125 | Karabo SIBANDA |
BOT |
44.47 q PB |
| 7 | 2 | 3 | 2461 | Matthew HUDSON-SMITH |
GBR |
44.48 Q PB |
| 8 | 3 | 3 | 2171 | Ali Khamis Khamis |
BRN |
44.49 q NR |
| 9 | 4 | 3 | 3093 | Gil Roberts |
USA |
44.65 SB |
| 10 | 4 | 1 | 2327 | Luguelín SANTOS |
DOM |
44.71 SB |
| 11 | 5 | 3 | 2065 | Steven GARDINER |
BAH |
44.72 |
| 12 | 5 | 1 | 2620 | Javon FRANCIS |
JAM |
44.96 |
| 13 | 6 | 3 | 2275 | Yoandys Lescay |
CUB |
45.00 PB |
| 14 | 6 | 1 | 2262 | Nery Brenes |
CRC |
45.02 |
| 15 | 7 | 1 | 2780 | Liemarvin BONEVACIA |
NED |
45.03 SB |
| 16 | 3 | 2 | 2304 | Pavel MASLÁK |
CZE |
45.06 SB |
| 17 | 4 | 2 | 2929 | Luka JANEŽIČ |
SLO |
45.07 NR |
| 18 | 8 | 1 | 2980 | Lalonde Gordon |
TTO |
45.13 |
| 19 | 7 | 3 | 2849 | Rafał Omelko |
POL |
45.28 |
| 20 | 5 | 2 | 3102 | David Verburg |
USA |
45.61 |
| 21 | 6 | 2 | 2623 | Rusheen MCDONALD |
JAM |
46.12 |
| 22 | 8 | 3 | 2121 | Isaac MAKWALA |
BOT |
46.60 |
| 23 | 7 | 2 | 2880 | Abdalelah Haroun |
QAT |
46.66 |
| 2 | 2126 | Baboloki THEBE |
BOT |
DNS |