| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 186 | Mikael de Jesús |  BRA | 51.50 Q | 0.181 | 
| 2 | 532 | Timor Barrett |  JAM | 51.56 Q PB | 0.180 | 
| 3 | 257 | Matej Mach |  CZE | 52.32 Q | 0.221 | 
| 4 | 145 | Branson Rolle |  BAH | 52.69 | 0.148 | 
| 5 | 498 | Adam Yakobi |  ISR | 54.03 | 0.179 | 
| 6 | 932 | Yolver Cumache |  VEN | 54.68 | 0.169 | 
| 7 | 175 | Omphemetse Poo |  BOT | 55.61 | 0.153 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 766 | Kefilwe Mogawane |  RSA | 50.53 Q PB | 0.175 | 
| 2 | 901 | Taylor MCLAUGHLIN |  USA | 51.28 Q | 0.188 | 
| 3 | 239 | Hrvoje Cukman |  CRO | 51.89 Q PB | 0.190 | 
| 4 | 743 | Michael Ramos |  PUR | 53.49 | 0.162 | 
| 5 | 699 | Ephraim Lerkin |  PNG | 53.67 | 0.193 | 
| 231 | Joshuan Berrios |  COL | DQ R163.3(a) | 0.173 | |
| 669 | Timothy EMEOGHENE |  NGR | DQ R163.3(a) | 0.192 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 530 | Kyron MCMASTER |  IVB | 51.77 Q | 0.176 | 
| 2 | 346 | Victor COROLLER |  FRA | 52.16 Q | 0.164 | 
| 3 | 602 | Hyunbin Kim |  KOR | 52.27 Q | 0.176 | 
| 4 | 850 | Sinan ÖREN |  TUR | 53.19 | 0.197 | 
| 5 | 838 | Mohamed TOUATI |  TUN | 53.79 | 0.165 | 
| 6 | 442 | José Humberto Bermúdez |  GUA | 53.89 | 0.173 | 
| 7 | 279 | Pablo Andres IBAÑEZ GUEVARA |  ESA | 54.56 PB | 0.158 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 539 | Jaheel HYDE |  JAM | 50.81 Q | 0.173 | 
| 2 | 473 | Santhosh Kumar TAMILARASAN |  IND | 51.46 Q PB | 0.237 | 
| 3 | 526 | Gabriele Montefalcone |  ITA | 51.91 Q | 0.204 | 
| 4 | 803 | Viktor Nylander |  SWE | 52.30 q | 0.191 | 
| 5 | 786 | Uditha Chandrasena |  SRI | 52.63 | 0.189 | 
| 6 | 490 | Jassam Mohammed Mayil |  IRQ | 53.48 | 0.216 | 
| 7 | 162 | Kiryl Borys |  BLR | 53.90 | 0.180 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 836 | Mohamed Fares JLASSI |  TUN | 51.49 Q PB | 0.153 | 
| 2 | 778 | Ned AZEMIA |  SEY | 51.50 Q NU20R | 0.214 | 
| 3 | 568 | Tatsuhiro YAMAMOTO |  JPN | 51.51 Q | 0.137 | 
| 4 | 222 | Yijie Wang |  CHN | 51.83 q | 0.154 | 
| 5 | 457 | Aftab Alam |  IND | 52.34 q PB | 0.170 | 
| 6 | 475 | Mohammadreza Rahmani |  IRI | 53.71 | 0.201 | 
| 7 | 587 | Nicholas Kiprotich Chirchir |  KEN | 56.90 | 0.175 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 567 | Yoshiro Watanabe |  JPN | 51.10 Q | 0.210 | 
| 2 | 137 | Dominik Hufnagl |  AUT | 51.72 Q | 0.168 | 
| 3 | 640 | Mohamed Reda Elbilaoui |  MAR | 53.34 Q | 0.147 | 
| 876 | Justin Alexander |  USA | DQ R163.2(b) | 0.200 | |
| 358 | Predea Manounou |  FRA | DQ R168.7(a) | 0.167 | |
| 196 | Callum Macnab |  CAN | DNF q | 0.145 | |
| 638 | Nomenjanahary Rakotoarimiandry |  MAD | DNF | 0.173 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 148 | Rivaldo Leacock |  BAR | 51.62 Q | 0.165 | 
| 2 | 623 | Maksims Sincukovs |  LAT | 52.04 Q | 0.145 | 
| 3 | 218 | Debin Gong |  CHN | 52.11 Q | 0.197 | 
| 4 | 155 | Dylan Owusu |  BEL | 52.79 | 0.206 | 
| 5 | 818 | Alisher Pulotov |  TJK | 53.27 PB | 0.227 | 
| 6 | 739 | Dangel Cotto |  PUR | 53.34 | 0.127 | 
| 7 | 507 | Federico Cesati |  ITA | 53.35 | 0.182 |