| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 468 | Colby Jennings | 
                                         
                                        TKS
                                     | 
                                    47.36 Q PB | 0.224 | 
| 2 | 226 | Melkamu Assefa | 
                                         
                                        ETH
                                     | 
                                    47.43 Q | 0.214 | 
| 3 | 342 | Kelvin Sane TAUTA | 
                                         
                                        KEN
                                     | 
                                    47.55 | 0.370 | 
| 4 | 282 | Elvin Josué Canales | 
                                         
                                        HON
                                     | 
                                    48.21 | 0.243 | 
| 5 | 442 | Thiruben S/O Thana Rajan | 
                                         
                                        SGP
                                     | 
                                    48.40 | 0.171 | 
| 6 | 154 | Musa ISAH | 
                                         
                                        BRN
                                     | 
                                    48.43 | 0.187 | 
| 7 | 179 | Bo Xu | 
                                         
                                        CHN
                                     | 
                                    48.90 | 0.226 | 
| 8 | 146 | Bernard Olesitse | 
                                         
                                        BOT
                                     | 
                                    50.54 | 0.161 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 311 | Anthony COX | 
                                         
                                        JAM
                                     | 
                                    46.86 Q | 0.266 | 
| 2 | 388 | Ivan Danny GELDENHUYS | 
                                         
                                        NAM
                                     | 
                                    47.24 Q PB | 0.181 | 
| 3 | 277 | Daniel WILLIAMS | 
                                         
                                        GUY
                                     | 
                                    47.46 q | 0.186 | 
| 4 | 340 | David Sanayek KAPIRANTE | 
                                         
                                        KEN
                                     | 
                                    47.66 | 0.199 | 
| 5 | 133 | Mohammad Jahir RAYHAN | 
                                         
                                        BAN
                                     | 
                                    48.22 | 0.198 | 
| 6 | 514 | José Álvarez | 
                                         
                                        VEN
                                     | 
                                    48.79 | 0.160 | 
| 7 | 161 | Hantao Deng | 
                                         
                                        CHN
                                     | 
                                    49.12 | 0.185 | 
| 8 | 130 | Tyrell Simms | 
                                         
                                        BAH
                                     | 
                                    49.38 | 0.167 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 148 | Bruno Silva | 
                                         
                                        BRA
                                     | 
                                    46.87 Q PB | 0.215 | 
| 2 | 319 | Antonio WATSON | 
                                         
                                        JAM
                                     | 
                                    47.05 Q PB | 0.000 | 
| 3 | 448 | Gregor GRAHOVAC | 
                                         
                                        SLO
                                     | 
                                    47.34 q PB | 0.183 | 
| 4 | 500 | Yaroslav Demchenko | 
                                         
                                        UKR
                                     | 
                                    47.96 PB | 0.178 | 
| 5 | 355 | Reuben Nichols | 
                                         
                                        LCA
                                     | 
                                    48.01 PB | 0.215 | 
| 6 | 129 | Correy Sherrod | 
                                         
                                        BAH
                                     | 
                                    48.56 | 0.211 | 
| 7 | 457 | Thiran Ravishka | 
                                         
                                        SRI
                                     | 
                                    48.89 | 0.188 | 
| 398 | Antonio Grant | 
                                         
                                        PAN
                                     | 
                                    DQ | 0.203 |