400m Heats - (M), Heat:4 of 4 ; Official result since 13:13
| Rank | Lane | ID | Name | PB | Team | Cat | Result | Info | Video |
| 1 | 7 | 124 | ARCHAND CHRISTIAN BAGSIT | 46,88 | PHI | 48.66 | Q | ||
| 2 | 2 | 210 | NG CHIN HUI | 48,78 | SIN | 49.37 | q | ||
| 3 | 4 | 155 | ARIFF BIN JANURI | 50,33 | SIN | 50.39 | |||
| 4 | 5 | 198 | LUQMAN BIN ZAMROT | 49.88s | SIN | 52.75 | |||
| 6 | 192 | KHONG ZHI WEI | 50,84 | SIN | DNS | ||||
| 3 | 220 | POH SENG SONG | no | SIN | DNS |