| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS | ms* |
|---|---|---|---|---|---|---|---|
| 1 | 1 | 2 | 2106 | Busang Collen KEBINATSHIPI |
BOT |
43.61 Q WL | |
| 2 | 2 | 2 | 2562 | Rusheen MCDONALD |
JAM |
44.04 Q SB | |
| 3 | 3 | 2 | 2932 | Jereem RICHARDS |
TTO |
44.12 q SB | |
| 4 | 4 | 2 | 3029 | Jacory PATTERSON |
USA |
44.19 q | |
| 5 | 1 | 1 | 2867 | Zakithi NENE |
RSA |
44.20 Q | |
| 6 | 1 | 3 | 2108 | Bayapo NDORI |
BOT |
44.21 Q SB | |
| 7 | 2 | 1 | 2104 | Lee Bhekempilo EPPIE |
BOT |
44.51 Q | |
| 8 | 2 | 3 | 2606 | Yuki Joseph NAKAJIMA |
JPN |
44.53 Q | |
| 9 | 3 | 3 | 3063 | Muzala SAMUKONGA |
ZAM |
44.60 | |
| 10 | 3 | 1 | 2035 | Reece HOLDER |
AUS |
44.63 | |
| 11 | 4 | 1 | 2846 | Ammar Ismail YAHIA IBRAHIM |
QAT |
44.74 | |
| 12 | 5 | 2 | 2531 | Edoardo SCOTTI |
ITA |
44.77 | |
| 13 | 4 | 3 | 3021 | Khaleb MCRAE |
USA |
44.82 | .814 |
| 14 | 6 | 2 | 2870 | Lythe PILLAY |
RSA |
44.82 | .816 |
| 15 | 5 | 3 | 3027 | Vernon NORWOOD |
USA |
44.83 | |
| 16 | 7 | 2 | 2370 | Charles DOBSON |
GBR |
44.85 | |
| 17 | 5 | 1 | 2463 | Attila MOLNÁR |
HUN |
44.94 | |
| 18 | 6 | 3 | 2379 | Matthew HUDSON-SMITH |
GBR |
44.95 | |
| 19 | 7 | 3 | 2558 | Delano KENNEDY |
JAM |
44.97 | .970 |
| 19 | 7 | 3 | 2453 | Kirani JAMES |
GRN |
44.97 | .970 |
| 21 | 6 | 1 | 2564 | Bovel MCPHERSON |
JAM |
44.99 | |
| 22 | 7 | 1 | 2972 | Christopher BAILEY |
USA |
45.05 | |
| 23 | 8 | 1 | 2389 | Samuel REARDON |
GBR |
45.10 | |
| 24 | 8 | 2 | 2891 | Rok FERLAN |
SLO |
45.71 |
ms - Milliseconds - shown when two or more competitors finish with the same time down to hundredths of a second