| Order / Lane | Bib | ATHLETE | COUNTRY | PB | SB 2016 | 
|---|---|---|---|---|---|
| 1 | 376 | Kyle Clemons |  USA | 44.84o | 45.95 | 
| 2 | 161 | Nery Brenes |  CRC | 44.65o | 46.92 | 
| 3 | 337 | Luka JANEŽIČ |  SLO | 45.28o | 46.32 | 
| 4 | 269 | Boniface Ontuga MWERESA |  KEN | 45.01o | 46.44 | 
| 5 | 350 | Deon LENDORE |  TTO | 44.36o | 45.56 | 
| 6 | 233 | Bralon TAPLIN |  GRN | 44.89o | 45.20 | 
| Order / Lane | Bib | ATHLETE | COUNTRY | PB | SB 2016 | 
|---|---|---|---|---|---|
| 1 | 114 | Alonzo RUSSELL |  BAH | 45.65o | 46.58 | 
| 2 | 248 | Fitzroy Dunkley |  JAM | 45.78o | 46.04 | 
| 3 | 358 | Yavuz CAN |  TUR | 45.65o | 46.20 | 
| 4 | 349 | Lalonde Gordon |  TTO | 44.52o | 45.51 | 
| 5 | 321 | Abdalelah Haroun |  QAT | 44.27o | 45.88 | 
| 6 | 171 | Pavel MASLÁK |  CZE | 44.79o | 45.33o |