| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 2526 | Kyron MCMASTER |  IVB | 47.72 Q | 0.168 | 
| 2 | 2261 | Rasmus MÄGI |  EST | 48.30 Q | 0.180 | 
| 3 | 2965 | CJ ALLEN |  USA | 48.44 | 0.152 | 
| 4 | 2546 | Jaheel HYDE |  JAM | 48.49 | 0.150 | 
| 5 | 2090 | Julien WATRIN |  BEL | 48.94 | 0.205 | 
| 6 | 2721 | Ezekiel NATHANIEL |  NGR | 49.22 | 0.209 | 
| 7 | 2813 | Bassem HEMEIDA |  QAT | 49.50 | 0.172 | 
| 2504 | Mario LAMBRUGHI |  ITA | DQ | -0.017 | 
| Split | Mark | Athlete | COUNTRY | 
|---|---|---|---|
| 100 m | 11.25 |  Jaheel HYDE |  JAM | 
| 200 m | 22.12 |  Jaheel HYDE |  JAM | 
| 300 m | 34.30 |  Kyron MCMASTER |  IVB | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 2971 | Rai BENJAMIN |  USA | 47.24 Q | 0.169 | 
| 2 | 2113 | Alison DOS SANTOS |  BRA | 47.38 Q SB | 0.182 | 
| 3 | 2331 | Ludvy VAILLANT |  FRA | 48.48 | 0.194 | 
| 4 | 2578 | Kazuki KUROKAWA |  JPN | 48.58 PB | 0.144 | 
| 5 | 2363 | Emil AGYEKUM |  GER | 48.71 PB | 0.196 | 
| 6 | 2623 | Wiseman Were MUKHOBE |  KEN | 49.40 | 0.196 | 
| 7 | 2171 | Zhiyu XIE |  CHN | 49.57 | 0.189 | 
| 8 | 2867 | Julien BONVIN |  SUI | 49.75 | 0.175 | 
| Split | Mark | Athlete | COUNTRY | 
|---|---|---|---|
| 100 m | 11.34 |  Alison DOS SANTOS |  BRA | 
| 200 m | 22.21 |  Ludvy VAILLANT |  FRA | 
| 300 m | 34.37 |  Rai BENJAMIN |  USA | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 2742 | Karsten WARHOLM |  NOR | 47.09 Q | 0.162 | 
| 2 | 2537 | Roshawn CLARKE |  JAM | 47.34 Q WU20R | 0.198 | 
| 3 | 2968 | Trevor BASSITT |  USA | 47.38 q PB | 0.187 | 
| 4 | 2362 | Joshua ABUAKU |  GER | 48.39 q | 0.179 | 
| 5 | 2515 | Alessandro SIBILIO |  ITA | 48.43 | 0.152 | 
| 6 | 2929 | Yasmani COPELLO |  TUR | 48.66 SB | 0.220 | 
| 7 | 2310 | Wilfried HAPPIO |  FRA | 48.83 | 0.176 | 
| 8 | 2189 | Gerald DRUMMOND |  CRC | 49.31 | 0.169 | 
| Split | Mark | Athlete | COUNTRY | 
|---|---|---|---|
| 100 m | 11.15 |  Karsten WARHOLM |  NOR | 
| 200 m | 21.94 |  Karsten WARHOLM |  NOR | 
| 300 m | 33.94 |  Karsten WARHOLM |  NOR |