400m Men Semifinals, Heat:1 of 2 ; Official result since 17:56
| Rank | Lane | ID | Name | PB | Team | Cat | Result | Info | Video |
| 1 | 2 | 104 | BLAIR ANDREWS | NORT | 51.19 | Q | |||
| 2 | 8 | 113 | NURHIDAYAT YUSUF | SSUL | 51.58 | Q | |||
| 3 | 4 | 8 | 52656 SLD (U) MD AMMAR SAFWAN HJ ZAIDIN | BRUA | 53.26 | Q | |||
| 4 | 5 | 79 | PRIESTLEY GEORDAN MACDONALD DAVID | SAWK | 54.35 | q | |||
| 5 | 3 | 38 | JOSHUAJ. HOPANO | MIND | 54.52 | ||||
| 6 | 7 | 125 | ADAM BIN KITLI | LBUN | 54.53 | ||||
| 7 | 6 | 25 | MOHD EFWAN BIN HJ ASMALEE | BRUB | 57.16 |