400mH Men, Heat:1 of 2 ; Official result since 19:45
| Rank | Lane | ID | Name | SB | Team | Cat | Result | Info | Video |
| 1 | 5 | 201 | Gibson Jeffrey | 48.97 | Bahamas | Sen | 49.65 | ||
| 2 | 7 | 206 | Ukaoma Miles | 49.25 | Nigeria | Sen | 49.99 | ||
| 3 | 3 | 207 | Downing Quincy | 49.63 | United States | Sen | 50.34 | ||
| 4 | 8 | 200 | Suguimati Mahau | 49.65 | Brazil | Sen | 50.71 | ||
| 5 | 4 | 204 | Cray Eric | 49.12 | Philippines | Sen | 50.96 | ||
| 6 | 1 | 203 | Alejandro Eric | 50.49 | Puerto Rico | Sen | 51.36 | ||
| 7 | 6 | 208 | Harvey Jason | 49.03 | Ireland | Sen | 53.26 | ||
| 2 | 205 | Rodger Seb | 49.84 | England | Sen | DNF |