31st Southeast Asian Games

Finals
Name		Team	Time	FINA	Imp
1	Zheng Wen QUAH Singapore	Singapore	49.57	847	+0.8%	SB
2	Jonathan Eu Jin TAN Singapore	Singapore	50.14	819	-1.8%
2	Jeremie Luong Vietnam	Vietnam	50.14	819	+0.6%	PB
4	Quy Phuoc HOANG Vietnam	Vietnam	50.37	808	+0.2%	SB
5	Dulyawat KAEWSRIYONG Thailand	Thailand	50.79	788	+0.3%	PB
6	Welson Sim Wee Sheng Malaysia	Malaysia	50.81	787	+1.5%	SB
7	Kurniawan Joe Aditya Wijaya Indonesia	Indonesia	51.01	778	-0.5%
8	Erick Ahmad Fathoni Indonesia	Indonesia	51.28	766	–	PB

Preliminaries
Name		Team	Time	FINA	Imp
1	Jonathan Eu Jin TAN Singapore	Singapore	50.15	818	-1.8%
2	Zheng Wen QUAH Singapore	Singapore	50.67	793	-1.4%
3	Jeremie Luong Vietnam	Vietnam	50.69	793	-0.5%
4	Dulyawat KAEWSRIYONG Thailand	Thailand	50.71	792	+0.5%	PB
5	Welson Sim Wee Sheng Malaysia	Malaysia	50.84	786	+1.4%	SB
6	Quy Phuoc HOANG Vietnam	Vietnam	50.97	780	-1.0%
7	Kurniawan Joe Aditya Wijaya Indonesia	Indonesia	51.39	761	-1.2%
8	Erick Ahmad Fathoni Indonesia	Indonesia	51.59	752	–	PB
9	Arvin Singh Chahal Malaysia	Malaysia	51.69	747	–	PB
10	Supha SANGAWORAWONG Thailand	Thailand	52.03	733	-1.3%
11	Lahmann Palis Donovan Payne Philippines	Philippines	52.35	720	–
12	Eichler Pare Adrian Philipp Philippines	Philippines	52.73	704	–
13	Puch HEM Cambodia	Cambodia	55.10	617	+0.3%	PB
14	Phansovannarun MONTROSS Cambodia	Cambodia	57.29	549	-0.5%
15	Sayasone Phothivouth Laotia	Laotia	59.50	490	–
16	Phixaiyadeth Thirakul Laotia	Laotia	1:02.87	415	–	PB
17	Joao DA Silva Viegas Jose east Timor	east Timor	1:04.92	377	–
18	Jolanio GUTERRES east Timor	east Timor	1:11.08	287	–