| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 2558 | Antonio WATSON |  JAM | 44.13 Q PB | 0.158 | 
| 2 | 3018 | Vernon NORWOOD |  USA | 44.26 Q PB | 0.181 | 
| 3 | 2842 | Wayde VAN NIEKERK |  RSA | 44.65 q | 0.178 | 
| 4 | 2919 | Jereem RICHARDS |  TTO | 44.76 | 0.160 | 
| 5 | 2589 | Kentaro SATO |  JPN | 44.99 | 0.180 | 
| 6 | 2431 | Attila MOLNÁR |  HUN | 45.02 | 0.156 | 
| 7 | 2646 | Michael JOSEPH |  LCA | 45.50 | 0.161 | 
| 8 | 2101 | Leungo SCOTCH |  BOT | 45.96 | 0.162 | 
| Split | Mark | Athlete | COUNTRY | 
|---|---|---|---|
| 100 m | 10.92 |  Jereem RICHARDS |  TTO | 
| 200 m | 20.91 |  Jereem RICHARDS |  TTO | 
| 300 m | 32.12 |  Antonio WATSON |  JAM | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 2349 | Matthew HUDSON-SMITH |  GBR | 44.26 Q AR | 0.167 | 
| 2 | 2413 | Kirani JAMES |  GRN | 44.58 Q | 0.147 | 
| 3 | 2731 | Håvard Bentdal INGVALDSEN |  NOR | 44.70 q | 0.190 | 
| 4 | 2588 | Fuga SATO |  JPN | 44.88 PB | 0.150 | 
| 5 | 2699 | Liemarvin BONEVACIA |  NED | 45.23 | 0.175 | 
| 6 | 2530 | Zandrion BARNES |  JAM | 45.38 | 0.171 | 
| 7 | 2073 | Dylan BORLÉE |  BEL | 45.59 | 0.153 | 
| 8 | 2097 | Busang Collen KEBINATSHIPI |  BOT | 46.39 | 0.168 | 
| Split | Mark | Athlete | COUNTRY | 
|---|---|---|---|
| 100 m | 10.82 |  Kirani JAMES |  GRN | 
| 200 m | 20.85 |  Kirani JAMES |  GRN | 
| 300 m | 32.23 |  Matthew HUDSON-SMITH |  GBR | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 2989 | Quincy HALL |  USA | 44.43 Q | 0.176 | 
| 2 | 2529 | Sean BAILEY |  JAM | 44.94 Q | 0.165 | 
| 3 | 2582 | Yuki Joseph NAKAJIMA |  JPN | 45.04 PB | 0.215 | 
| 4 | 2511 | Davide RE |  ITA | 45.29 | 0.165 | 
| 5 | 2079 | Alexander DOOM |  BEL | 45.57 | 0.168 | 
| 6 | 2833 | Zakithi NENE |  RSA | 45.64 | 0.151 | 
| 2060 | Steven GARDINER |  BAH | DNF | 0.221 | |
| 2099 | Bayapo NDORI |  BOT | DNF | 0.159 | 
| Split | Mark | Athlete | COUNTRY | 
|---|---|---|---|
| 100 m | 11.06 |  Zakithi NENE |  RSA | 
| 200 m | 21.15 |  Steven GARDINER |  BAH | 
| 300 m | 32.57 |  Steven GARDINER |  BAH |