| Order / Lane | Bib | ATHLETE | COUNTRY | PB | SB 2023 | 
|---|---|---|---|---|---|
| 3 | 2625 | Boniface Ontuga MWERESA |  KEN | 44.96 | 45.42 | 
| 4 | 2859 | Aruna Dharshana SINGHAPURAGE |  SRI | 45.45 | 45.45 | 
| 5 | 2646 | Michael JOSEPH |  LCA | 44.77 | 44.77 | 
| 6 | 2589 | Kentaro SATO |  JPN | 45.00 | 45.00 | 
| 7 | 2060 | Steven GARDINER |  BAH | 43.48 | 43.74 | 
| 8 | 2833 | Zakithi NENE |  RSA | 44.74 | 44.74 | 
| 9 | 2431 | Attila MOLNÁR |  HUN | 44.98 | 44.98 | 
| Order / Lane | Bib | ATHLETE | COUNTRY | PB | SB 2023 | 
|---|---|---|---|---|---|
| 3 | 2349 | Matthew HUDSON-SMITH |  GBR | 44.35 | 44.72 | 
| 4 | 2842 | Wayde VAN NIEKERK |  RSA | 43.03 | 44.08 | 
| 5 | 2064 | Alonzo RUSSELL |  BAH | 44.73 | 44.73 | 
| 6 | 2097 | Busang Collen KEBINATSHIPI |  BOT | 44.91 | 44.91 | 
| 7 | 2699 | Liemarvin BONEVACIA |  NED | 44.48 | 45.06 | 
| 8 | 2019 | Elián LARREGINA |  ARG | 45.34 | 45.34 | 
| 9 | 2186 | Anthony José ZAMBRANO |  COL | 43.93 | 45.52 | 
| Order / Lane | Bib | ATHLETE | COUNTRY | PB | SB 2023 | 
|---|---|---|---|---|---|
| 2 | 2919 | Jereem RICHARDS |  TTO | 44.54 | 44.54 | 
| 3 | 2956 | Oleksandr POHORILKO |  UKR | 45.31 | 45.31 | 
| 4 | 3018 | Vernon NORWOOD |  USA | 44.35 | 44.39 | 
| 5 | 2878 | Ricky PETRUCCIANI |  SUI | 45.02 | 46.27 | 
| 6 | 2073 | Dylan BORLÉE |  BEL | 45.09 | 45.09 | 
| 7 | 2068 | Jonathan JONES |  BAR | 44.43 | 45.70 | 
| 8 | 2731 | Håvard Bentdal INGVALDSEN |  NOR | 44.86 | 44.86 | 
| 9 | 2798 | João COELHO |  POR | 44.79 | 44.79 | 
| Order / Lane | Bib | ATHLETE | COUNTRY | PB | SB 2023 | 
|---|---|---|---|---|---|
| 2 | 2101 | Leungo SCOTCH |  BOT | 44.82 | 44.82 | 
| 3 | 2529 | Sean BAILEY |  JAM | 44.43 | 44.43 | 
| 4 | 2511 | Davide RE |  ITA | 44.77 | 45.21 | 
| 5 | 2588 | Fuga SATO |  JPN | 45.13 | 45.13 | 
| 6 | 2413 | Kirani JAMES |  GRN | 43.74 | 44.50 | 
| 7 | 2216 | Gustav Lundholm NIELSEN |  DEN | 45.80 | 45.80 | 
| 8 | 2889 | Carl BENGTSTRÖM |  SWE | 45.33 | 45.77 | 
| 9 | 2722 | Dubem NWACHUKWU |  NGR | 44.81 | 44.81 | 
| Order / Lane | Bib | ATHLETE | COUNTRY | PB | SB 2023 | 
|---|---|---|---|---|---|
| 2 | 2793 | Karol ZALEWSKI |  POL | 45.11 | 45.81 | 
| 3 | 2558 | Antonio WATSON |  JAM | 44.54 | 44.54 | 
| 4 | 2582 | Yuki Joseph NAKAJIMA |  JPN | 45.12 | 45.12 | 
| 5 | 2989 | Quincy HALL |  USA | 44.41 | 44.41 | 
| 6 | 2477 | Christopher O'DONNELL |  IRL | 45.26 | 45.73 | 
| 7 | 2834 | Lythe PILLAY |  RSA | 44.80 | 44.80 | 
| 8 | 2067 | Desean BOYCE |  BAR | 44.85 | 44.85 | 
| 9 | 2881 | Lionel SPITZ |  SUI | 45.25 | 45.25 | 
| Order / Lane | Bib | ATHLETE | COUNTRY | PB | SB 2023 | 
|---|---|---|---|---|---|
| 3 | 2207 | Matěj KRSEK |  CZE | 45.55 | 45.62 | 
| 4 | 2982 | Bryce DEADMON |  USA | 44.22 | 44.22 | 
| 5 | 2079 | Alexander DOOM |  BEL | 45.28 | 45.28 | 
| 6 | 2389 | Manuel SANDERS |  GER | 45.07 | 45.07 | 
| 7 | 2107 | Lucas CARVALHO |  BRA | 44.79 | 44.79 | 
| 8 | 2099 | Bayapo NDORI |  BOT | 44.61 | 44.61 | 
| 9 | 2530 | Zandrion BARNES |  JAM | 44.90 | 44.90 |