| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 358 | Christopher TAYLOR | 
                                         
                                        JAM
                                     | 
                                    45.30 Q WYL | 0.155 | 
| 2 | 628 | Josephus LYLES | 
                                         
                                        USA
                                     | 
                                    45.93 Q | 0.181 | 
| 3 | 54 | Karabo SIBANDA | 
                                         
                                        BOT
                                     | 
                                    46.53 q | 0.157 | 
| 4 | 374 | Manato Sasaki | 
                                         
                                        JPN
                                     | 
                                    46.85 q PB | 0.140 | 
| 5 | 114 | Haoran Xu | 
                                         
                                        CHN
                                     | 
                                    47.44 PB | 0.151 | 
| 6 | 490 | Tymoteusz ZIMNY | 
                                         
                                        POL
                                     | 
                                    47.53 PB | 0.151 | 
| 7 | 515 | André Nikolas Marich | 
                                         
                                        RSA
                                     | 
                                    48.34 | 0.128 | 
| 8 | 543 | Anej Zupanc | 
                                         
                                        SLO
                                     | 
                                    49.93 | 0.282 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 633 | Keshun Reed | 
                                         
                                        USA
                                     | 
                                    46.77 Q | 0.145 | 
| 2 | 23 | Louis Stenmark | 
                                         
                                        AUS
                                     | 
                                    46.78 Q PB | 0.183 | 
| 3 | 310 | Chandan Bauri | 
                                         
                                        IND
                                     | 
                                    47.41 | 0.158 | 
| 4 | 365 | Ryota Kitahara | 
                                         
                                        JPN
                                     | 
                                    47.85 | 0.201 | 
| 5 | 277 | Marvin SCHLEGEL | 
                                         
                                        GER
                                     | 
                                    47.92 | 0.203 | 
| 6 | 330 | Vladimir ACETI | 
                                         
                                        ITA
                                     | 
                                    48.59 | 0.176 | 
| 7 | 442 | Edgar RAMÍREZ | 
                                         
                                        MEX
                                     | 
                                    49.01 | 0.173 | 
| 8 | 389 | Josphat Kipngetich Ngeno | 
                                         
                                        KEN
                                     | 
                                    49.86 | 0.193 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 140 | Anthony José ZAMBRANO | 
                                         
                                        COL
                                     | 
                                    46.76 Q | 0.193 | 
| 2 | 91 | Jamal Walton | 
                                         
                                        CAY
                                     | 
                                    46.97 Q | 0.153 | 
| 3 | 243 | Loïc PREVOT | 
                                         
                                        FRA
                                     | 
                                    47.03 | 0.169 | 
| 4 | 112 | Yu Ang WU | 
                                         
                                        CHN
                                     | 
                                    48.11 | 0.186 | 
| 5 | 441 | Roger Ordaz | 
                                         
                                        MEX
                                     | 
                                    48.59 | 0.164 | 
| 6 | 265 | Florian Colon Marti | 
                                         
                                        GER
                                     | 
                                    48.84 | 0.187 | 
| 7 | 388 | Edwin Ngeeti | 
                                         
                                        KEN
                                     | 
                                    49.26 | 0.235 | 
| 558 | Miquel Shepper | 
                                         
                                        SUR
                                     | 
                                    DQ R163.3(a) | 0.231 |