List of junior world records in swimming
Boys
Legend: # – Record awaiting ratification by FINA; Records not set in finals: h – heat; sf – semifinal; r – relay 1st leg; rh – relay heat 1st leg; b – B final; † – en route to final mark; tt – time trial

List of junior world records in swimming

Section Title: Boys
Table Section Text: Legend: # – Record awaiting ratification by FINA; Records not set in finals: h – heat; sf – semifinal; r – relay 1st leg; rh – relay heat 1st leg; b – B final; † – en route to final mark; tt – time trial

Event	Time	Name	Nationality	Date	Meet	Location	Ref

50m freestyle	21.75	h, =	Michael Andrew	United States	25 August 2017	World Junior Championships	Indianapolis, United States

50m freestyle	21.75	=	Michael Andrew	United States	26 August 2017	World Junior Championships	Indianapolis, United States

100m freestyle	47.58	Kyle Chalmers	Australia	10 August 2016	Olympic Games	Rio de Janeiro, Brazil

200m freestyle	1:46.40	Ivan Girev	Russia	24 August 2017	World Junior Championships	Indianapolis, United States

200m freestyle	1:46.13	not ratified	Elijah Winnington	Australia	18 December 2018	Queensland Championships	Brisbane, Australia

200m freestyle	1:43.90	not ratified, fastest all-time junior	Danila Izotov	Russia	28 July 2009	World Championships	Rome, Italy

400m freestyle	3:44.60	Mack Horton	Australia	1 April 2014	Australian Championships	Brisbane, Australia

400m freestyle	3:40.59	not ratified, fastest all-time junior	Ian Thorpe	Australia	16 September 2000	Olympic Games	Sydney, Australia

800m freestyle	7:45.67	WB	Mack Horton	Australia	28 August 2013	World Junior Championships	Dubai, United Arab Emirates

1500m freestyle	14:51.55	Mack Horton	Australia	6 April 2014	Australian Championships	Brisbane, Australia

1500m freestyle	14:48.76	not ratified	Mack Horton	Australia	29 July 2014	Commonwealth Games	Glasgow, United Kingdom

1500m freestyle	14:46.84	not ratified, fastest all-time junior	Sun Yang	China	2 August 2009	World Championships	Rome, Italy

50m backstroke	24.00	Kliment Kolesnikov	Russia	4 August 2018	European Championships	Glasgow, United Kingdom

100m backstroke	52.53	Kliment Kolesnikov	Russia	6 August 2018	European Championships	Glasgow, United Kingdom

200m backstroke	1:55.14	Kliment Kolesnikov	Russia	28 July 2017	World Championships	Budapest, Hungary

50m breaststroke	26.97	h	Nicolò Martinenghi	Italy	4 April 2017	Italian Championships	Riccione, Italy

100m breaststroke	59.01	sf	Nicolò Martinenghi	Italy	23 August 2017	World Junior Championships	Indianapolis, United States

200m breaststroke	2:09.39	h	Qin Haiyang	China	27 July 2017	World Championships	Budapest, Hungary

200m breaststroke	2:08.71	not ratified	Qin Haiyang	China	15 April 2017	Chinese Championships	Qingdao, China

200m breaststroke	2:07.35	not ratified	Qin Haiyang	China	4 September 2017	National Games	Tianjin, China

200m breaststroke	2:07.01	not ratified, fastest all-time junior	Akihiro Yamaguchi	Japan	15 September 2012	National Sports Festival	Gifu, Japan

50m butterfly	23.22	Michael Andrew	United States	27 August 2017	World Junior Championships	Indianapolis, United States

100m butterfly	50.62	Kristóf Milák	Hungary	29 July 2017	World Championships	Budapest, Hungary

200m butterfly	1:53.79	Kristóf Milák	Hungary	30 June 2017	European Junior Championships	Netanya, Israel

200m butterfly	1:52.71	not ratified	Kristóf Milák	Hungary	28 March 2018	Hungarian Championships	Debrecen, Hungary

200m individual medley	1:57.06	Qin Haiyang	China	26 July 2017	World Championships	Budapest, Hungary

200m individual medley	1:55.94	not ratified, fastest all-time junior	Michael Phelps	United States	9 August 2003	USA Championships	College Park, United States

400m individual medley	4:14.00	h	Sean Grieshop	United States	26 June 2016	U.S. Olympic Trials	Omaha, United States

400m individual medley	4:08.94	not ratified, fastest all-time junior	Kosuke Hagino	Japan	28 July 2012	Olympic Games	London, United Kingdom

4×100m freestyle relay	3:16.96	WB	(49.14)Luke Percy (49.11)Regan Leong (49.38)Blake Jones (49.33)Mack Horton	Australia	26 August 2013	World Junior Championships	Dubai, United Arab Emirates

4×200m freestyle relay	7:10.95	(1:48.68)Richárd Márton (1:47.52)Kristóf Milák (1:48.23)Balázs Holló (1:46.52)Nándor Németh	Hungary	26 August 2017	World Junior Championships	Indianapolis, United States

4×100m medley relay	3:35.24	(54.72)Thomas Ceccon (58.93)Nicolò Martinenghi (52.69)Federico Burdisso (48.90)Davide Nardini	Italy	2 July 2017	European Junior Championships	Netanya, Israel

4×100m medley relay	3:35.17	not ratified	(53.34)Kliment Kolesnikov (1:01.50)Vladislav Gerasimenko (51.14)Andrei Minakov (49.19)Daniil Markov	Russia	10 October 2018	Youth Olympic Games	Buenos Aires, Argentina

Sentence(s)

Mack Horton won the 1500 meter freestyle in 14:51.55 and finished the 400-meter freestyle in 3:44.60, setting two junior world records at the 2014 Australian Swimming Championships.

final_sentence: Mack Horton won the 1500 meter freestyle in 14:51.55 and finished the 400-meter freestyle in 3:44.60, setting two junior world records at the 2014 Australian Swimming Championships.