400mH Men, Heat:1 of 2 ; Official result since 19:08
| Rank | Lane | ID | Name | SB | Team | Cat | Result | Info | Video |
| 1 | 5 | 110 | Culson Javier | 48.10 | Puerto Rico | Sen | 48.41 | ||
| 2 | 6 | 111 | Dutch Johnny | 49.24 | United States | Sen | 49.27 | ||
| 3 | 4 | 116 | Barr Thomas | 48.90 | Ireland | Sen | 49.95 | ||
| 4 | 7 | 114 | Suguimati Mahau | 49.52 | Brazil | Sen | 50.16 | ||
| 5 | 2 | 119 | Rodger Seb | 49.51 | England | Sen | 50.72 | ||
| 6 | 8 | 118 | Nozawa Keisuke | 50.26 | Japan | Sen | 52.04 | ||
| 3 | 112 | Wyatt Reggie | 49.32 | United States | Sen | DNF |