| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 1481 | Michael Johnson | 
                                         
                                        USA
                                     | 
                                    43.95 Q | 0.143 | 
| 2 | 993 | Alejandro Manuel Cárdenas | 
                                         
                                        MEX
                                     | 
                                    44.37 Q NR | 0.128 | 
| 3 | 153 | Sanderlei Parrela | 
                                         
                                        BRA
                                     | 
                                    44.37 Q AR | 0.186 | 
| 4 | 533 | Mark Richardson | 
                                         
                                        GBR
                                     | 
                                    44.47 Q SB | 0.210 | 
| 5 | 1454 | Jerome Davis | 
                                         
                                        USA
                                     | 
                                    44.51 PB | 0.143 | 
| 6 | 1141 | Tomasz Czubak | 
                                         
                                        POL
                                     | 
                                    44.62 NR | 0.184 | 
| 7 | 862 | Kennedy Ochieng | 
                                         
                                        KEN
                                     | 
                                    45.57 | 0.312 | 
| 8 | 814 | Danny McFarlane | 
                                         
                                        JAM
                                     | 
                                    45.86 | 0.246 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 808 | Gregory Haughton | 
                                         
                                        JAM
                                     | 
                                    45.09 Q | 0.155 | 
| 2 | 516 | Jamie Baulch | 
                                         
                                        GBR
                                     | 
                                    45.24 Q | 0.162 | 
| 3 | 1293 | Matija Å estak | 
                                         
                                        SLO
                                     | 
                                    45.47 | 0.144 | 
| 4 | 1281 | Ibrahima Wade | 
                                         
                                        SEN
                                     | 
                                    45.66 | 0.242 | 
| 5 | 156 | Anderson Jorge dos Santos | 
                                         
                                        BRA
                                     | 
                                    45.67 | 0.174 | 
| 1498 | Antonio Pettigrew | 
                                         
                                        USA
                                     | 
                                    DQ | 0.308 | |
| 1513 | Jerome Young | 
                                         
                                        USA
                                     | 
                                    DQ | 0.163 | |
| 1160 | Piotr Rysiukiewicz | 
                                         
                                        POL
                                     | 
                                    DNF | 0.224 |