Swimming at the 2018 Summer Youth Olympics – Boys' 50 metre breaststroke

The heats were started on 11 October at 11:16.[2]

Rank	Heat	Lane	Name	Nationality	Time	Notes
1	5	4	Sun Jiajun	China	27.91	Q
2	4	5	Michael Houlie	South Africa	27.99	Q
3	3	4	Taku Taniguchi	Japan	28.28	Q
4	5	2	Denis Petrashov	Kyrgyzstan	28.43	Q
5	5	5	Alexander Milanovich	Canada	28.46	Q
6	3	2	Santiago Saint-Upery	Uruguay	28.47	Q
7	3	3	André Klippenberg Grindheim	Norway	28.55	Q
8	4	3	Juri Dijkstra	Netherlands	28.79	Q
9	4	6	Caspar Corbeau	Netherlands	28.90	Q
10	4	1	Andrés Puente	Mexico	28.95	Q
11	5	3	Didzis Rudavs	Latvia	28.98	Q
12	4	2	Izaak Bastian	Bahamas	29.01	Q
13	4	4	Vladislav Gerasimenko	Russia	29.03	Q
14	5	1	Samy Ahmed Boutouil	Morocco	29.12	Q
15	3	5	Vitor de Souza	Brazil	29.16	Q
16	5	6	Yu Hanaguruma	Japan	29.18	Q
17	5	7	Aleksey Sidorchuk	Uzbekistan	29.24
18	2	3	Demirkan Demir	Turkey	29.25
19	2	4	Moncef Aymen Balamane	Algeria	29.30
20	3	6	Jan Kałusowski	Poland	29.40
21	3	1	Ethan Dang	United States	29.50
22	4	7	Sebestyén Böhm	Hungary	29.57
23	3	7	Ahmed Yassine Fliyou	Morocco	29.59
24	4	8	Dávid Gajdoš	Slovakia	29.64
25	1	6	Samuele Rossi	Seychelles	29.66
26	2	5	Amro Al-Wir	Jordan	29.71
27	3	8	Maximillian Ang	Singapore	30.09
28	2	6	Marcus Mok	Hong Kong	30.37
29	2	2	Simon Greuter	Liechtenstein	31.13
30	2	7	Leonard Kalate	Papua New Guinea	31.45
30	5	8	Luis Weekes	Barbados	31.45
32	2	1	Daniel Scott	Guyana	33.28
33	1	4	Omar Barry	Burkina Faso	41.81
34	1	3	Andrés Akue	Equatorial Guinea	44.81
	2	8	Momodou Saine	The Gambia	DSQ
	1	5	Eddie Boyengue	Republic of the Congo	DNS

The semifinals were started on 11 October at 18:58.[3]

Rank	Heat	Lane	Name	Nationality	Time	Notes
1	1	4	Michael Houlie	South Africa	27.33	Q
2	2	4	Sun Jiajun	China	28.05	Q
3	2	3	Alexander Milanovich	Canada	28.19	Q
4	2	5	Taku Taniguchi	Japan	28.22	Q
5	2	1	Vladislav Gerasimenko	Russia	28.43	Q
6	2	2	Caspar Corbeau	Netherlands	28.44	Q
7	2	8	Vitor de Souza	Brazil	28.53	Q
8	1	5	Denis Petrashov	Kyrgyzstan	28.62	Q
9	1	3	Santiago Saint-Upery	Uruguay	28.76
10	1	6	Juri Dijkstra	Netherlands	28.77
11	2	7	Didzis Rudavs	Latvia	28.89
12	2	6	André Klippenberg Grindheim	Norway	28.93
13	1	2	Andrés Puente	Mexico	28.97
14	1	8	Yu Hanaguruma	Japan	29.01
15	1	1	Samy Ahmed Boutouil	Morocco	29.10
16	1	7	Izaak Bastian	Bahamas	29.35

The final was held on 12 October at 19:29.[4]

Rank	Lane	Name	Nationality	Time	Notes
	4	Michael Houlie	South Africa	27.51
	5	Sun Jiajun	China	27.85
	3	Alexander Milanovich	Canada	27.87
4	6	Taku Taniguchi	Japan	28.20
5	1	Vitor de Souza	Brazil	28.24
6	2	Vladislav Gerasimenko	Russia	28.36
7	7	Caspar Corbeau	Netherlands	28.70
7	8	Denis Petrashov	Kyrgyzstan	28.70