| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 3295 | Abderrahman Almoubarrake S ALSALECK |  QAT | 48.38 Q | 0.200 | 
| 2 | 1318 | Alison DOS SANTOS |  BRA | 48.42 Q | 0.152 | 
| 3 | 1008 | Abdelmalik LAHOULOU |  ALG | 48.83 Q SB | 0.149 | 
| 4 | 2611 | Kemar MOWATT |  JAM | 49.06 Q | 0.139 | 
| 5 | 1979 | Ludvy VAILLANT |  FRA | 49.23 q | 0.152 | 
| 6 | 2274 | Máté KOROKNAI |  HUN | 49.80 | 0.151 | 
| 7 | 3602 | Chieh CHEN |  TPE | 50.96 =SB | 0.158 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 2592 | Jaheel HYDE |  JAM | 48.54 Q | 0.184 | 
| 2 | 3968 | Kenneth SELMON |  USA | 48.61 Q | 0.185 | 
| 3 | 2724 | Hiromu YAMAUCHI |  JPN | 49.21 Q | 0.184 | 
| 4 | 2172 | Constantin PREIS |  GER | 49.73 Q | 0.215 | 
| 5 | 2962 | Creve Armando MACHAVA |  MOZ | 50.37 SB | 0.159 | 
| 6 | 3649 | Mohamed TOUATI |  TUN | 50.58 | 0.152 | 
| 7 | 1791 | Sergio FERNÁNDEZ |  ESP | 51.51 | 0.152 | 
| 8 | 3457 | Ned AZEMIA |  SEY | 51.67 | 0.151 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 3086 | Karsten WARHOLM |  NOR | 48.65 Q | 0.157 | 
| 2 | 2341 | Thomas BARR |  IRL | 49.02 Q | 0.147 | 
| 3 | 2439 | Alessandro SIBILIO |  ITA | 49.11 Q | 0.126 | 
| 4 | 2154 | Luke CAMPBELL |  GER | 49.19 Q SB | 0.145 | 
| 5 | 1958 | Wilfried HAPPIO |  FRA | 49.39 q | 0.152 | 
| 6 | 1333 | Marcio TELES |  BRA | 49.70 SB | 0.154 | 
| 7 | 1564 | Gerald DRUMMOND |  CRC | 49.92 | 0.183 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 2456 | Kyron MCMASTER |  IVB | 48.79 Q | 0.184 | 
| 2 | 3668 | Yasmani COPELLO |  TUR | 49.00 Q | 0.188 | 
| 3 | 2626 | Shawn ROWE |  JAM | 49.18 Q SB | 0.157 | 
| 4 | 3939 | David KENDZIERA |  USA | 49.23 Q | 0.192 | 
| 5 | 2145 | Joshua ABUAKU |  GER | 49.50 q SB | 0.169 | 
| 6 | 2702 | Kazuki KUROKAWA |  JPN | 50.30 | 0.154 | 
| 7 | 1562 | Jordin ANDRADE |  CPV | 50.64 SB | 0.202 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 3907 | Rai BENJAMIN |  USA | 48.60 Q | 0.209 | 
| 2 | 1824 | Rasmus MÄGI |  EST | 48.73 Q | 0.160 | 
| 3 | 3444 | Sokwakhana ZAZINI |  RSA | 49.51 Q SB | 0.147 | 
| 4 | 3026 | Nick SMIDT |  NED | 49.55 Q | 0.181 | 
| 5 | 1637 | Vít MÜLLER |  CZE | 49.59 q | 0.143 | 
| 6 | 2683 | Takatoshi ABE |  JPN | 49.98 | 0.166 | 
| 7 | 2299 | Jabir MADARI PALLIYALIL |  IND | 50.77 | 0.167 |