| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS | 
|---|---|---|---|---|---|---|
| 1 | 1 | 2 | 1611 | Alison DOS SANTOS |  BRA | 47.85 Q | 
| 2 | 1 | 3 | 2197 | Karsten WARHOLM |  NOR | 48.00 Q SB | 
| 3 | 2 | 3 | 1832 | Wilfried HAPPIO |  FRA | 48.14 Q PB | 
| 4 | 2 | 2 | 2353 | Trevor BASSITT |  USA | 48.17 Q | 
| 5 | 3 | 3 | 2417 | Khallifah ROSSER |  USA | 48.34 q | 
| 6 | 3 | 2 | 1785 | Rasmus MÄGI |  EST | 48.40 q | 
| 7 | 1 | 1 | 2357 | Rai BENJAMIN |  USA | 48.44 Q | 
| 8 | 4 | 3 | 2032 | Kemar MOWATT |  JAM | 48.59 | 
| 9 | 4 | 2 | 2296 | Carl BENGTSTRÖM |  SWE | 48.75 | 
| 10 | 5 | 2 | 1506 | Abdelmalik LAHOULOU |  ALG | 48.90 | 
| 11 | 2 | 1 | 2029 | Jaheel HYDE |  JAM | 49.09 Q | 
| 12 | 6 | 2 | 2099 | Moitalel MPOKE |  KEN | 49.34 | 
| 13 | 7 | 2 | 1699 | Gerald DRUMMOND |  CRC | 49.37 | 
| 14 | 3 | 1 | 1586 | Julien WATRIN |  BEL | 49.52 | 
| 15 | 5 | 3 | 2168 | Nick SMIDT |  NED | 49.56 | 
| 16 | 6 | 3 | 2061 | Kazuki KUROKAWA |  JPN | 49.69 | 
| 17 | 4 | 1 | 2157 | Ramsey ANGELA |  NED | 49.77 | 
| 18 | 8 | 2 | 2037 | Shawn ROWE |  JAM | 49.80 | 
| 19 | 5 | 1 | 1973 | Thomas BARR |  IRL | 50.08 | 
| 20 | 7 | 3 | 2272 | Sokwakhana ZAZINI |  RSA | 50.22 | 
| 21 | 6 | 1 | 1861 | Alastair CHALMERS |  GBR | 50.54 | 
| 22 | 7 | 1 | 2327 | Yasmani COPELLO |  TUR | 51.49 | 
| 23 | 8 | 3 | 2179 | Ezekiel NATHANIEL |  NGR | 54.18 | 
| 1 | 2013 | Kyron MCMASTER |  IVB | DNS |