| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 181 | Khamal Stewart-Baynes |  CAN | 47.10 Q | 0.156 | 
| 2 | 177 | Musa ISAH |  BRN | 47.50 Q | 0.158 | 
| 3 | 511 | Antonio Grant |  PAN | 47.64 Q | 0.196 | 
| 4 | 140 | Correy Sherrod |  BAH | 48.22 | 0.262 | 
| 5 | 252 | Abdurahman Abdo |  ETH | 48.46 | 0.207 | 
| 668 | Ahmed AL YAARI |  YEM | DNS | ||
| 531 | João COELHO |  POR | DNS | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 147 | Jonathan SACOOR |  BEL | 46.56 Q | 0.161 | 
| 2 | 207 | Matěj KRSEK |  CZE | 47.05 Q | 0.141 | 
| 3 | 233 | Alfredo Jimenez |  ESP | 47.12 Q PB | 0.169 | 
| 4 | 468 | Ilhwan Mo |  KOR | 47.23 q | 0.155 | 
| 5 | 378 | Milad Naseh Jahani |  IRI | 47.91 | 0.188 | 
| 6 | 107 | Slimane MOULA |  ALG | 47.97 | 0.174 | 
| 7 | 441 | Daichi SAWA |  JPN | 48.15 | 0.144 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 565 | Aruna DHARSHANA |  SRI | 46.81 Q | 0.235 | 
| 2 | 174 | Bruno Silva |  BRA | 47.05 Q | 0.193 | 
| 3 | 397 | Klaudio Gjetja |  ITA | 47.09 Q PB | 0.190 | 
| 4 | 561 | Jure Grkman |  SLO | 47.56 | 0.190 | 
| 5 | 365 | . Gaurav |  IND | 48.61 | 0.179 | 
| 6 | 547 | Mihai Cristian PÃŽSLARU |  ROU | 49.74 | 0.190 | 
| 592 | Colby Jennings |  TKS | DNF | 0.154 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 419 | Chantz Sawyers |  JAM | 46.52 Q | 0.170 | 
| 2 | 551 | Gabriel Louw |  RSA | 47.32 Q | 0.179 | 
| 3 | 519 | Szymon Kreft |  POL | 47.35 Q | 0.216 | 
| 4 | 564 | Boško KIJANOVIĆ |  SRB | 47.42 q PB | 0.190 | 
| 5 | 671 | Ngoni Joel Chadyiwa |  ZIM | 48.04 | 0.214 | 
| 6 | 440 | Shuji Mori |  JPN | 48.12 | 0.159 | 
| 326 | Joshua HARTMANN |  GER | DNS | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 145 | Jonathan JONES |  BAR | 46.05 Q PB | 0.187 | 
| 2 | 642 | Howard Fields |  USA | 47.08 Q | 0.173 | 
| 3 | 316 | Jean Paul BREDAU |  GER | 47.11 Q | 0.226 | 
| 4 | 479 | Iļja PETRUŠENKO |  LAT | 47.66 | 0.159 | 
| 5 | 209 | Ondřej Holub |  CZE | 47.71 | 0.236 | 
| 6 | 599 | Onal Mitchell |  TTO | 47.77 | 0.150 | 
| 7 | 483 | Rija Vatomanga Gardiner |  MAD | 48.31 | 0.139 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 417 | Christopher TAYLOR |  JAM | 46.14 Q | 0.326 | 
| 2 | 402 | Edoardo SCOTTI |  ITA | 46.52 Q PB | 0.200 | 
| 3 | 578 | Ricky PETRUCCIANI |  SUI | 47.03 Q NU20R | 0.213 | 
| 4 | 115 | Christian Davis |  AUS | 47.07 q | 0.307 | 
| 5 | 453 | Laban Kiplangat |  KEN | 47.69 | 0.198 | 
| 6 | 562 | Lovro MESEC KOÅ IR |  SLO | 47.88 | 0.187 | 
| 7 | 518 | Sebastian Jakubowski |  POL | 48.39 | 0.181 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 186 | Myles MISENER-DALEY |  CAN | 46.87 Q | 0.178 | 
| 2 | 662 | Umajesty Williams |  USA | 47.16 Q | 0.196 | 
| 3 | 669 | Kennedy LUCHEMBE |  ZAM | 47.25 Q | 0.178 | 
| 4 | 675 | Leon Tafirenyika |  ZIM | 47.55 | 0.201 | 
| 5 | 604 | Alaeddine Kebsi |  TUN | 47.96 | 0.200 | 
| 6 | 558 | Stefano Antoine Bibi |  SEY | 48.92 PB | 0.173 | 
| 256 | Melkamu Assefa |  ETH | DQ | 0.196 |