| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS | 
|---|---|---|---|---|---|---|
| 1 | 1 | 1 | 233 | Bralon TAPLIN | 
 GRN                 | 
                45.38 Q | 
| 2 | 1 | 2 | 171 | Pavel MASLÁK | 
 CZE                 | 
                45.71 Q | 
| 3 | 2 | 2 | 321 | Abdalelah Haroun | 
 QAT                 | 
                45.71 Q SB | 
| 4 | 3 | 2 | 349 | Lalonde Gordon | 
 TTO                 | 
                46.03 Q | 
| 5 | 2 | 1 | 350 | Deon LENDORE | 
 TTO                 | 
                46.23 Q | 
| 6 | 3 | 1 | 269 | Boniface Ontuga MWERESA | 
 KEN                 | 
                46.33 Q SB | 
| 7 | 4 | 1 | 161 | Nery Brenes | 
 CRC                 | 
                46.49 SB | 
| 8 | 4 | 2 | 358 | Yavuz CAN | 
 TUR                 | 
                46.82 | 
| 9 | 5 | 1 | 376 | Kyle Clemons | 
 USA                 | 
                46.91 | 
| 10 | 5 | 2 | 114 | Alonzo RUSSELL | 
 BAH                 | 
                47.07 | 
| 11 | 6 | 2 | 248 | Fitzroy Dunkley | 
 JAM                 | 
                47.13 | 
| 1 | 337 | Luka JANEŽIČ | 
 SLO                 | 
                DQ R163.3(b) |