| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 2410 | Michael NORMAN |  USA | 44.30 Q | 0.127 | 
| 2 | 1874 | Matthew HUDSON-SMITH |  GBR | 44.38 Q | 0.160 | 
| 3 | 2041 | Christopher TAYLOR |  JAM | 44.97 q SB | 0.173 | 
| 4 | 2264 | Zakithi NENE |  RSA | 45.24 | 0.121 | 
| 5 | 1571 | Dylan BORLÉE |  BEL | 45.41 | 0.163 | 
| 6 | 2075 | Julian Jrummi WALSH |  JPN | 45.75 | 0.134 | 
| 7 | 1736 | Lidio Andres FELIZ |  DOM | 46.19 | 0.192 | 
| 8 | 1526 | Alex BECK |  AUS | 46.21 | 0.140 | 
| Split | Mark | Athlete | COUNTRY | 
|---|---|---|---|
| 100 m | 10.85 |  Michael NORMAN |  USA | 
| 200 m | 21.06 |  Matthew HUDSON-SMITH |  GBR | 
| 300 m | 32.02 |  Matthew HUDSON-SMITH |  GBR | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 1945 | Kirani JAMES |  GRN | 44.74 Q | 0.148 | 
| 2 | 1595 | Bayapo NDORI |  BOT | 44.94 Q | 0.141 | 
| 3 | 2437 | Muzala SAMUKONGA |  ZAM | 45.02 PB | 0.196 | 
| 4 | 2366 | Michael CHERRY |  USA | 45.28 | 0.143 | 
| 5 | 2069 | Fuga SATO |  JPN | 45.71 | 0.175 | 
| 6 | 1579 | Alexander DOOM |  BEL | 45.80 | 0.170 | 
| 7 | 1979 | Christopher O'DONNELL |  IRL | 46.01 | 0.162 | 
| 2014 | Nathon ALLEN |  JAM | DNF | 0.182 | 
| Split | Mark | Athlete | COUNTRY | 
|---|---|---|---|
| 100 m | 10.99 |  Kirani JAMES |  GRN | 
| 200 m | 21.35 |  Kirani JAMES |  GRN | 
| 300 m | 32.64 |  Kirani JAMES |  GRN | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 2351 | Champion ALLISON |  USA | 44.71 Q | 0.155 | 
| 2 | 2268 | Wayde VAN NIEKERK |  RSA | 44.75 Q | 0.168 | 
| 3 | 1566 | Jonathan JONES |  BAR | 44.78 q | 0.149 | 
| 4 | 1872 | Alex HAYDOCK-WILSON |  GBR | 45.08 PB | 0.141 | 
| 5 | 1572 | Kévin BORLÉE |  BEL | 45.26 | 0.139 | 
| 6 | 2159 | Liemarvin BONEVACIA |  NED | 45.50 | 0.159 | 
| 7 | 2080 | Mikhail LITVIN |  KAZ | 45.63 SB | 0.189 | 
| 8 | 1594 | Isaac MAKWALA |  BOT | 46.04 | 0.158 | 
| Split | Mark | Athlete | COUNTRY | 
|---|---|---|---|
| 100 m | 10.84 |  Wayde VAN NIEKERK |  RSA | 
| 200 m | 20.97 |  Wayde VAN NIEKERK |  RSA | 
| 300 m | 32.35 |  Wayde VAN NIEKERK |  RSA |