| | Event type

50 metres Breaststroke, Boys

Date	11 – 12 October 2018
Status	YOG
Location	Natatorium, Parque Olímpico de la Juventud, Villa Soldati, Buenos Aires
Participants	35 from 32 countries

Pos	Swimmer	NOC	R1	SF	Final
1	Michael Houlie	RSA	27.99 (1 h4)	27.33 (1 h1)	27.51 (1)	Gold
2	Sun Jiajun	CHN	27.91 (1 h5)	28.05 (1 h2)	27.85 (2)	Silver
3	Alexander Milanovich	CAN	28.46 (3 h5)	28.19 (2 h2)	27.87 (3)	Bronze
4	Taku Taniguchi	JPN	28.28 (1 h3)	28.22 (3 h2)	28.20 (4)
5	Vitor de Souza	BRA	29.16 (4 h3)	28.53 (6 h2)	28.24 (5)
6	Vladislav Gerasimenko	RUS	29.03 (6 h4)	28.43 (4 h2)	28.36 (6)
=7	Caspar Corbeau	NED	28.90 (3 h4)	28.44 (5 h2)	28.70 (=7)
=7	Denis Petrashov	KGZ	28.43 (2 h5)	28.62 (2 h1)	28.70 (=7)
9	Santiago Saint-Upery	URU	28.47 (2 h3)	28.76 (3 h1)	–
10	André Klippenberg Grindheim	NOR	28.55 (3 h3)	28.93 (8 h2)	–
11	Juri Dijkstra	NED	28.79 (2 h4)	28.77 (4 h1)	–
12	Andrés Puente	MEX	28.95 (4 h4)	28.97 (5 h1)	–
13	Didzis Rudavs	LAT	28.98 (4 h5)	28.89 (7 h2)	–
14	Izaak Bastian	BAH	29.01 (5 h4)	29.35 (8 h1)	–
15	Samy Boutouil	MAR	29.12 (5 h5)	29.10 (7 h1)	–
16	Yu Hanaguruma	JPN	29.18 (6 h5)	29.01 (6 h1)	–
17	Aleksey Sidorchuk	UZB	29.24 (7 h5)	–	–
18	Demirkan Demir	TUR	29.25 (1 h2)	–	–
19	Moncef Balamane	ALG	29.30 (2 h2)	–	–
20	Jan Kałusowski	POL	29.40 (5 h3)	–	–
21	Ethan Dang	USA	29.50 (6 h3)	–	–
22	Sebestyén Böhm	HUN	29.57 (7 h4)	–	–
23	Ahmed Fliyou	MAR	29.59 (7 h3)	–	–
24	Dávid Gajdoš	SVK	29.64 (8 h4)	–	–
25	Samuele Rossi	SEY	29.66 (1 h1)	–	–
26	Amro Al-Wir	JOR	29.71 (3 h2)	–	–
27	Maximillian Ang	SGP	30.09 (8 h3)	–	–
28	Marcus Mok	HKG	30.37 (4 h2)	–	–
29	Simon Greuter	LIE	31.13 (5 h2)	–	–
=30	Leonard Kalate	PNG	31.45 (6 h2)	–	–
=30	Luis Weekes	BAR	31.45 (8 h5)	–	–
32	Daniel Scott	GUY	33.28 (7 h2)	–	–
33	Omar Barry	BUR	41.81 (2 h1)	–	–
34	Andrés Akue	GEQ	44.81 (3 h1)	–	–
DQ	Momodou Saine	GAM	– (DQ h2)	–	–
DNS	Eddie Boyengue	CGO	– (DNS h5)	–	–

Round One (11 October 2018 — 11:16)

Top 16 advance to the semi-finals.

Heat One (11:16)

Pos	Lane	Swimmer	NOC	Time
1	–	Samuele Rossi	SEY	– (–) –	29.66
2	–	Omar Barry	BUR	– (–) –	41.81
3	–	Andrés Akue	GEQ	– (–) –	44.81

Heat Two

Pos	Lane	Swimmer	NOC	Time
1	–	Demirkan Demir	TUR	– (–) –	29.25
2	–	Moncef Balamane	ALG	– (–) –	29.30
3	–	Amro Al-Wir	JOR	– (–) –	29.71
4	–	Marcus Mok	HKG	– (–) –	30.37
5	–	Simon Greuter	LIE	– (–) –	31.13
6	–	Leonard Kalate	PNG	– (–) –	31.45
7	–	Daniel Scott	GUY	– (–) –	33.28
DQ	–	Momodou Saine	GAM	– (–) –	–

Heat Three

Pos	Lane	Swimmer	NOC	Time
1	–	Taku Taniguchi	JPN	– (–) –	28.28	Q
2	–	Santiago Saint-Upery	URU	– (–) –	28.47	Q
3	–	André Klippenberg Grindheim	NOR	– (–) –	28.55	Q
4	–	Vitor de Souza	BRA	– (–) –	29.16	Q
5	–	Jan Kałusowski	POL	– (–) –	29.40
6	–	Ethan Dang	USA	– (–) –	29.50
7	–	Ahmed Fliyou	MAR	– (–) –	29.59
8	–	Maximillian Ang	SGP	– (–) –	30.09

Heat Four

Pos	Lane	Swimmer	NOC	Time
1	–	Michael Houlie	RSA	– (–) –	27.99	Q
2	–	Juri Dijkstra	NED	– (–) –	28.79	Q
3	–	Caspar Corbeau	NED	– (–) –	28.90	Q
4	–	Andrés Puente	MEX	– (–) –	28.95	Q
5	–	Izaak Bastian	BAH	– (–) –	29.01	Q
6	–	Vladislav Gerasimenko	RUS	– (–) –	29.03	Q
7	–	Sebestyén Böhm	HUN	– (–) –	29.57
8	–	Dávid Gajdoš	SVK	– (–) –	29.64

Heat Five

Pos	Lane	Swimmer	NOC	Time
1	–	Sun Jiajun	CHN	– (–) –	27.91	Q
2	–	Denis Petrashov	KGZ	– (–) –	28.43	Q
3	–	Alexander Milanovich	CAN	– (–) –	28.46	Q
4	–	Didzis Rudavs	LAT	– (–) –	28.98	Q
5	–	Samy Boutouil	MAR	– (–) –	29.12	Q
6	–	Yu Hanaguruma	JPN	– (–) –	29.18	Q
7	–	Aleksey Sidorchuk	UZB	– (–) –	29.24
8	–	Luis Weekes	BAR	– (–) –	31.45
DNS	–	Eddie Boyengue	CGO	– (–) –	–

Semi-Finals (11 October 2018 — 18:58)

Top 8 advance to the final round.

Heat One (18:58)

Pos	Lane	Swimmer	NOC	Time
1	–	Michael Houlie	RSA	– (–) –	27.33	Q
2	–	Denis Petrashov	KGZ	– (–) –	28.62	Q
3	–	Santiago Saint-Upery	URU	– (–) –	28.76
4	–	Juri Dijkstra	NED	– (–) –	28.77
5	–	Andrés Puente	MEX	– (–) –	28.97
6	–	Yu Hanaguruma	JPN	– (–) –	29.01
7	–	Samy Boutouil	MAR	– (–) –	29.10
8	–	Izaak Bastian	BAH	– (–) –	29.35

Heat Two

Pos	Lane	Swimmer	NOC	Time
1	–	Sun Jiajun	CHN	– (–) –	28.05	Q
2	–	Alexander Milanovich	CAN	– (–) –	28.19	Q
3	–	Taku Taniguchi	JPN	– (–) –	28.22	Q
4	–	Vladislav Gerasimenko	RUS	– (–) –	28.43	Q
5	–	Caspar Corbeau	NED	– (–) –	28.44	Q
6	–	Vitor de Souza	BRA	– (–) –	28.53	Q
7	–	Didzis Rudavs	LAT	– (–) –	28.89
8	–	André Klippenberg Grindheim	NOR	– (–) –	28.93

Final Round (12 October 2018 — 19:29)

Pos	Lane	Swimmer	NOC	Time
1	–	Michael Houlie	RSA	– (–) –	27.51
2	–	Sun Jiajun	CHN	– (–) –	27.85
3	–	Alexander Milanovich	CAN	– (–) –	27.87
4	–	Taku Taniguchi	JPN	– (–) –	28.20
5	–	Vitor de Souza	BRA	– (–) –	28.24
6	–	Vladislav Gerasimenko	RUS	– (–) –	28.36
=7	–	Caspar Corbeau	NED	– (–) –	28.70
=7	–	Denis Petrashov	KGZ	– (–) –	28.70