| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 40 | Steven SOLOMON |  AUS | 46.07 Q | 0.152 | 
| 2 | 568 | Alphas Leken KISHOYIAN |  KEN | 46.46 q | 0.145 | 
| 3 | 778 | Nikita Uglov |  RUS | 46.49 q | 0.206 | 
| 4 | 202 | Mateo RUŽIĆ |  CRO | 47.46 | 0.145 | 
| 4 | 489 | Michele Tricca |  ITA | 46.92 | 0.210 | 
| 6 | 588 | Basheer Atiah Al Barakati |  KSA | 47.48 | 0.209 | 
| 7 | 748 | Sorin Vatamanu |  ROU | 48.15 | 0.196 | 
| 228 | LuguelÃn SANTOS |  DOM | DQ | 0.201 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 917 | Arman Hall |  USA | 46.42 Q | 0.153 | 
| 2 | 854 | Machel CEDENIO |  TTO | 46.59 Q | 0.233 | 
| 3 | 689 | Andrew Whyte |  NZL | 46.81 | 0.158 | 
| 4 | 958 | José Meléndez |  VEN | 46.83 | 0.187 | 
| 5 | 751 | Pieter CONRADIE |  RSA | 46.87 | 0.163 | 
| 6 | 52 | O'Jay Ferguson |  BAH | 47.02 | 0.172 | 
| 7 | 417 | Stephan James |  GUY | 47.35 | 0.172 | 
| 8 | 780 | Nikita Besnin |  RUS | 48.02 | 0.202 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 901 | Aldrich BAILEY JR |  USA | 45.79 Q | 0.165 | 
| 2 | 515 | Javon FRANCIS |  JAM | 46.06 Q PB | 0.216 | 
| 3 | 574 | Boniface Ontuga MWERESA |  KEN | 46.20 q | 0.222 | 
| 4 | 702 | Patryk DOBEK |  POL | 46.56 | 0.191 | 
| 5 | 31 | Jarryd Buchan |  AUS | 46.81 PB | 0.167 | 
| 6 | 491 | Marco Lorenzi |  ITA | 47.25 | 0.206 | 
| 7 | 403 | Daniel Gyasi |  GHA | 47.78 | 0.266 | 
| 8 | 246 | Julio ARENAS |  ESP | 50.00 | 0.160 |