| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS | ms* |
|---|---|---|---|---|---|---|---|
| 1 | 1 | 3 | 3029 | Jacory PATTERSON |
USA |
43.90 Q | |
| 2 | 1 | 6 | 3021 | Khaleb MCRAE |
USA |
44.25 Q | |
| 3 | 1 | 5 | 2867 | Zakithi NENE |
RSA |
44.34 Q | |
| 4 | 1 | 2 | 2108 | Bayapo NDORI |
BOT |
44.36 Q | |
| 5 | 2 | 3 | 2562 | Rusheen MCDONALD |
JAM |
44.38 Q SB | |
| 6 | 2 | 2 | 2606 | Yuki Joseph NAKAJIMA |
JPN |
44.44 Q NR | .433 |
| 6 | 2 | 6 | 2104 | Lee Bhekempilo EPPIE |
BOT |
44.44 Q | .433 |
| 8 | 3 | 3 | 2531 | Edoardo SCOTTI |
ITA |
44.45 Q NR | |
| 9 | 4 | 3 | 2106 | Busang Collen KEBINATSHIPI |
BOT |
44.48 q SB | |
| 10 | 1 | 4 | 2972 | Christopher BAILEY |
USA |
44.49 Q | |
| 11 | 3 | 2 | 2564 | Bovel MCPHERSON |
JAM |
44.51 Q PB | |
| 12 | 2 | 4 | 2035 | Reece HOLDER |
AUS |
44.54 Q =SB | |
| 13 | 2 | 5 | 3027 | Vernon NORWOOD |
USA |
44.55 Q | .544 |
| 14 | 3 | 5 | 2463 | Attila MOLNÁR |
HUN |
44.55 Q NR | .548 |
| 15 | 3 | 4 | 3063 | Muzala SAMUKONGA |
ZAM |
44.56 Q | |
| 16 | 4 | 5 | 2846 | Ammar Ismail YAHIA IBRAHIM |
QAT |
44.63 q PB | |
| 17 | 1 | 1 | 2932 | Jereem RICHARDS |
TTO |
44.64 Q | |
| 18 | 3 | 6 | 2453 | Kirani JAMES |
GRN |
44.66 Q | |
| 19 | 4 | 2 | 2379 | Matthew HUDSON-SMITH |
GBR |
44.68 q | |
| 20 | 4 | 4 | 2389 | Samuel REARDON |
GBR |
44.70 q | |
| 21 | 2 | 1 | 2870 | Lythe PILLAY |
RSA |
44.73 Q SB | |
| 22 | 4 | 6 | 2558 | Delano KENNEDY |
JAM |
44.74 q PB | |
| 23 | 3 | 1 | 2370 | Charles DOBSON |
GBR |
44.85 Q | |
| 24 | 5 | 5 | 2891 | Rok FERLAN |
SLO |
44.91 q | |
| 25 | 5 | 2 | 2014 | Elián LARREGINA |
ARG |
44.97 | |
| 26 | 4 | 1 | 2091 | Daniel SEGERS |
BEL |
45.04 | |
| 27 | 5 | 6 | 2651 | George MUTINDA |
KEN |
45.07 | |
| 28 | 5 | 1 | 2613 | Fuga SATO |
JPN |
45.10 SB | .092 |
| 29 | 6 | 2 | 2081 | Alexander DOOM |
BEL |
45.10 | .099 |
| 30 | 6 | 1 | 2661 | Brian Onyari TINEGA |
KEN |
45.13 | |
| 31 | 6 | 5 | 2847 | Mihai Sorin DRINGO |
ROU |
45.21 | |
| 32 | 5 | 4 | 2461 | Patrik Simon ENYINGI |
HUN |
45.25 | |
| 33 | 6 | 6 | 2164 | Christopher MORALES WILLIAMS |
CAN |
45.26 | |
| 34 | 6 | 4 | 2637 | Kevin KIPKORIR |
KEN |
45.39 | |
| 35 | 7 | 1 | 2963 | Oleksandr POHORILKO |
UKR |
45.44 | |
| 36 | 7 | 2 | 2050 | Cooper SHERMAN |
AUS |
45.53 | |
| 37 | 7 | 4 | 2905 | Lionel SPITZ |
SUI |
45.57 | |
| 38 | 7 | 6 | 2258 | Alexander OGANDO |
DOM |
45.59 | |
| 39 | 8 | 2 | 2751 | Chidi OKEZIE |
NGR |
45.66 | |
| 40 | 8 | 1 | 2806 | Maksymilian SZWED |
POL |
45.67 | |
| 41 | 5 | 3 | 2750 | Samuel OGAZI |
NGR |
45.97 | .961 |
| 42 | 8 | 4 | 2739 | Eugene OMALLA |
NED |
45.97 | .967 |
| 43 | 6 | 3 | 2405 | Jean Paul BREDAU |
GER |
46.05 | |
| 44 | 7 | 5 | 2535 | Luca SITO |
ITA |
46.22 | |
| 45 | 8 | 5 | 2576 | Antonio WATSON |
JAM |
46.23 | |
| 46 | 7 | 3 | 2740 | Jonas PHIJFFERS |
NED |
46.26 | |
| 47 | 8 | 6 | 2735 | Isaya KLEIN IKKINK |
NED |
46.32 | |
| 48 | 8 | 3 | 2700 | Umar OSMAN |
MAS |
46.43 |
ms - Milliseconds - shown when two or more competitors finish with the same time down to hundredths of a second