| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 836 | Mohamed Fares JLASSI |  TUN | 50.82 Q NU20R | 0.154 | 
| 2 | 567 | Yoshiro Watanabe |  JPN | 50.95 Q | 0.140 | 
| 3 | 473 | Santhosh Kumar TAMILARASAN |  IND | 51.54 | 0.210 | 
| 4 | 778 | Ned AZEMIA |  SEY | 51.64 | 0.227 | 
| 5 | 526 | Gabriele Montefalcone |  ITA | 51.70 | 0.216 | 
| 6 | 239 | Hrvoje Cukman |  CRO | 51.82 PB | 0.248 | 
| 7 | 222 | Yijie Wang |  CHN | 52.28 | 0.166 | 
| 8 | 640 | Mohamed Reda Elbilaoui |  MAR | 53.49 | 0.144 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 530 | Kyron MCMASTER |  IVB | 50.49 Q SB | 0.177 | 
| 2 | 218 | Debin Gong |  CHN | 51.25 Q | 0.239 | 
| 3 | 532 | Timor Barrett |  JAM | 51.38 PB | 0.180 | 
| 4 | 623 | Maksims Sincukovs |  LAT | 51.89 PB | 0.158 | 
| 5 | 148 | Rivaldo Leacock |  BAR | 52.22 | 0.218 | 
| 6 | 602 | Hyunbin Kim |  KOR | 52.57 | 0.178 | 
| 7 | 196 | Callum Macnab |  CAN | 53.85 | 0.150 | 
| 457 | Aftab Alam |  IND | DQ R163.3(a) | 0.172 | |
| 766 | Kefilwe Mogawane |  RSA | DNF | 0.167 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 539 | Jaheel HYDE |  JAM | 49.77 Q | 0.153 | 
| 2 | 901 | Taylor MCLAUGHLIN |  USA | 50.25 Q | 0.164 | 
| 3 | 568 | Tatsuhiro YAMAMOTO |  JPN | 50.84 q PB | 0.136 | 
| 4 | 186 | Mikael de Jesús |  BRA | 50.86 q | 0.177 | 
| 5 | 137 | Dominik Hufnagl |  AUT | 51.04 PB | 0.161 | 
| 6 | 346 | Victor COROLLER |  FRA | 51.35 | 0.155 | 
| 7 | 803 | Viktor Nylander |  SWE | 52.79 | 0.176 | 
| 8 | 257 | Matej Mach |  CZE | 53.49 | 0.139 |