| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 19 | Demetrius Pinder |  BAH | 46.49 Q | 0.413 | 
| 2 | 170 | Tabarie Henry |  ISV | 46.71 Q SB | 0.194 | 
| 3 | 95 | Mark UJAKPOR |  ESP | 47.06 q | 0.202 | 
| 4 | 223 | Wala Gime |  PNG | 48.85 | 0.429 | 
| 5 | 26 | Yaovi Michael Gougou |  BEN | 51.20 NR | 0.383 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 154 | Kirani JAMES |  GRN | 46.64 Q | 0.264 | 
| 2 | 60 | Nery Brenes |  CRC | 46.77 Q SB | 0.245 | 
| 3 | 80 | Luguelín SANTOS |  DOM | 47.07 q PB | 0.238 | 
| 4 | 247 | Maksim Aleksandrenko |  RUS | 47.78 q | 0.454 | 
| 276 | Rabah YOUSIF |  SUD | DQ | 0.283 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 123 | Nigel Levine |  GBR | 47.56 Q | 0.243 | 
| 2 | 178 | Lorenzo Valentini |  ITA | 48.58 Q | 0.286 | 
| 3 | 59 | Jannot Bacar |  COM | 49.58 | 0.315 | 
| 4 | 314 | Andrés Silva |  URU | 51.93 SB | 0.227 | 
| 286 | Lalonde Gordon |  TTO | DQ | 0.229 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 330 | Gil Roberts |  USA | 47.57 Q | 0.296 | 
| 2 | 249 | Valentin Kruglyakov |  RUS | 47.70 Q | 0.269 | 
| 3 | 289 | Jarrin Solomon |  TTO | 47.82 | 0.412 | 
| 4 | 83 | Takeshi Fujiwara |  ESA | 48.96 SB | 0.359 | 
| 5 | 205 | Kristijan Erfemov |  MKD | 50.23 | 0.431 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 72 | Pavel MASLÁK |  CZE | 47.00 Q | 0.277 | 
| 2 | 116 | Richard Buck |  GBR | 47.05 Q | 0.240 | 
| 3 | 79 | Erison Hurtault |  DMA | 47.63 q | 0.224 | 
| 4 | 168 | Trausti Stefánsson |  ISL | 48.86 | 0.303 | 
| 5 | 41 | Ak. Hafiy Tajuddin Rositi |  BRU | 51.02 NR | 0.142 | 
| 6 | 216 | Hussein Al-Fedheili |  OMA | 55.15 PB | 0.418 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 16 | Chris Brown |  BAH | 47.28 Q | 0.247 | 
| 2 | 334 | Calvin Smith |  USA | 47.46 Q | 0.382 | 
| 3 | 294 | Ali Ekber Kayas |  TUR | 47.55 q | 0.326 | 
| 4 | 134 | Nika Kartavtsevi |  GEO | 48.27 PB | 0.301 | 
| 5 | 221 | Bahaa Al Farra |  PLE | 51.65 NR | 0.447 | 
| 6 | 156 | Jeofry Limtiaco |  GUM | 53.67 NR | 0.462 |