| | Event type

4 × 100 metres Medley Relay, Mixed

Date	29 – 31 July 2021
Status	Olympic
Location	Olympic Aquatics Centre, 2-1, 2chome, Tatsumi, Koto-ku, Tatsumi-no-Mori Seaside Park, Tokyo, Japan
Participants	76 from 16 countries

This was a new event on the Olympic Program and was very hard to predict as nobody knew exactly who would swim for the various nations, and the swim order of men and woman also made prognostication difficult. It had been contested at the World Championships since 2015, with Great Britain winning in 2015, the United States in 2017, and Australia in 2019. All three top swimming nations, they were expected to battle for medals here, alongside China.

The heats were led by Great Britain and China, with the United States and Australia second in heats one and two, respectively. For the final, Britain swam F/M/M/F, with Australia using the same order, while the United States swan M/F/F/M and China used M/M/F/F.

Ryan Murphy opened the backstroke leg for the USA and gave the Americans the early lead, although Italy’s Thomas Ceccon was tied with him at the end of the opening 100. Nicolo Martinenghi put Italy in the lead at 200 with a strong breaststroke leg, as the USA dropped back to sixth, and China second and the Russian Olympic Committee team, which opened with two men, third.

James Guy swam the butterfly leg for Great Britain and put them in front, with China moving into second, as Zhang Yufei swam a strong female butterfly leg, and Italy held on to third. On the freestyle leg, Caeleb Dressel was the only male swimmer but he was too far behind to get into the medals. Great Britain held on the for the gold behind Anna Hopkin while China edged out Australia for the silver medal. The USA finished fifth, only the second time in Olympic history that they had failed to medal in an Olympic swim relay, after the men’s 4 x 200 free relay earlier in Tokyo.

Pos	Competitors	NOC	R1	Final
1	Great Britain	GBR	3:38.75 (1 h1)	3:37.58 (1)	Gold
	Kathleen Dawson • Adam Peaty • James Guy • Anna Hopkin • Freya Anderson
2	People's Republic of China	CHN	3:42.29 (1 h2)	3:38.86 (2)	Silver
	Xu Jiayu • Yan Zibei • Zhang Yufei • Yang Junxuan
3	Australia	AUS	3:42.35 (2 h2)	3:38.95 (3)	Bronze
	Kaylee McKeown • Zac Stubblety-Cook • Matthew Temple • Emma McKeon • Isaac Cooper • Brianna Throssell • Bronte Campbell
4	Italy	ITA	3:42.65 (3 h2)	3:39.28 (4)
	Thomas Ceccon • Nicolò Martinenghi • Elena Di Liddo • Federica Pellegrini • Simone Sabbioni
5	United States	USA	3:41.02 (2 h1)	3:40.58 (5)
	Ryan Murphy • Lydia Jacoby • Torri Huske • Caeleb Dressel • Regan Smith • Andrew Wilson • Tom Shields • Abbey Weitzeil
6	Netherlands	NED	3:43.25 (3 h1)	3:41.25 (6)
	Kira Toussaint • Arno Kamminga • Nyls Korstanje • Femke Heemskerk • Ranomi Kromowidjojo
7	ROC	ROC	3:43.73 (4 h2)	3:42.45 (7)
	Yevgeny Rylov • Kirill Prigoda • Svetlana Chimrova • Mariya Kameneva • Grigory Tarasevich • Arina Surkova
8	Israel	ISR	3:43.94 (5 h2)	3:44.77 (8)
	Anastasia Gorbenko • Itay Goldfaden • Gal Cohen Groumi • Andi Murez
9	Japan	JPN	3:44.15 (6 h2)	–
	Anna Konishi • Shoma Sato • Katsuhiro Matsumoto • Rikako Ikee
10	Germany	GER	3:44.19 (4 h1)	–
	Marek Ulrich • Fabian Schwingenschlögl • Lisa Höpink • Annika Bruhn
11	Greece	GRE	3:44.77 (7 h2)	–
	Apostolos Christou • Konstantinos Meretsolias • Anna Ntountounaki • Nora Drakou
12	Belarus	BLR	3:46.35 (8 h2)	–
	Mikita Tsmyh • Ilia Shymanovich • Anastasiya Kuliashova • Anastasiya Shkurdai
13	Canada	CAN	3:46.54 (5 h1)	–
	Javier Acevedo • Gabe Mastromatteo • Katerine Savard • Rebecca Smith
14	Brazil	BRA	3:46.74 (6 h1)	–
	Guilherme Basseto • Felipe Lima • Giovanna Diamante • Stephanie Balduccini
15	Hungary	HUN	3:47.15 (7 h1)	–
	Benedek Kovács • Petra Halmai • Richárd Márton • Fanni Gyurinovics
16	Poland	POL	– (DQ h1)	–
	Paulina Peda • Jan Kozakiewicz • Jakub Majerski • Kornelia Fiedkiewicz

Round One

Date	29 July 2021 — 20:25

Pos	Lane	Competitors	NOC	Time
1	4	Great Britain	GBR	3:38.75	Q
2	5	United States	USA	3:41.02	Q
3	4	People's Republic of China	CHN	3:42.29	Q
4	5	Australia	AUS	3:42.35	Q
5	6	Italy	ITA	3:42.65	Q
6	3	Netherlands	NED	3:43.25	Q
7	3	ROC	ROC	3:43.73	Q
8	8	Israel	ISR	3:43.94	Q
9	2	Japan	JPN	3:44.15
10	2	Germany	GER	3:44.19
11	7	Greece	GRE	3:44.77
12	1	Belarus	BLR	3:46.35
13	6	Canada	CAN	3:46.54
14	7	Brazil	BRA	3:46.74
15	8	Hungary	HUN	3:47.15
DQ	1	Poland	POL	–

Heat #1

Time	20:25

Pos	Lane	Competitors	NOC	Time	Reaction Time	50 m Time	Split	Exchange
1	4	Great Britain	GBR	3:38.75	–	–	– (–)	– (–)	Q
Backstroke	–	Kathleen Dawson		–	0.60	28.18	58.50 (6)	– (–)
Breaststroke	–	Adam Peaty		–	0.09	26.04	57.08 (1)	1:55.58 (4)
Butterfly	–	James Guy		–	0.10	23.31	50.58 (1)	2:46.16 (1)
Freestyle	–	Freya Anderson		–	0.20	25.07	52.59 (1)	– (–)
2	5	United States	USA	3:41.02	–	–	– (–)	– (–)	Q
Backstroke	–	Regan Smith		–	0.60	28.25	57.64 (5)	– (–)
Breaststroke	–	Andrew Wilson		–	0.38	27.65	59.09 (4)	1:56.73 (5)
Butterfly	–	Tom Shields		–	0.11	23.27	50.87 (2)	2:47.60 (2)
Freestyle	–	Abbey Weitzeil		–	0.39	25.11	53.42 (3)	– (–)
3	3	Netherlands	NED	3:43.25	–	–	– (–)	– (–)	Q
Backstroke	–	Kira Toussaint		–	0.51	29.01	1:00.12 (7)	– (–)
Breaststroke	–	Arno Kamminga		–	0.38	26.92	58.15 (2)	1:58.27 (6)
Butterfly	–	Nyls Korstanje		–	0.15	23.95	51.86 (4)	2:50.13 (3)
Freestyle	–	Ranomi Kromowidjojo		–	0.09	25.39	53.12 (2)	– (–)
4	2	Germany	GER	3:44.19	–	–	– (–)	– (–)
Backstroke	–	Marek Ulrich		–	0.56	25.84	53.82 (2)	– (–)
Breaststroke	–	Fabian Schwingenschlögl		–	0.13	26.81	58.35 (3)	1:52.17 (1)
Butterfly	–	Lisa Höpink		–	0.24	26.34	58.06 (6)	2:50.23 (4)
Freestyle	–	Annika Bruhn		–	0.08	25.62	53.96 (5)	– (–)
5	6	Canada	CAN	3:46.54	–	–	– (–)	– (–)
Backstroke	–	Javier Acevedo		–	0.59	26.40	54.31 (4)	– (–)
Breaststroke	–	Gabe Mastromatteo		–	0.37	27.67	59.91 (7)	1:54.22 (3)
Butterfly	–	Katerine Savard		–	0.30	26.63	57.97 (5)	2:52.19 (7)
Freestyle	–	Rebecca Smith		–	0.32	25.82	54.35 (6)	– (–)
6	7	Brazil	BRA	3:46.74	–	–	– (–)	– (–)
Backstroke	–	Guilherme Basseto		–	0.57	25.82	54.03 (3)	– (–)
Breaststroke	–	Felipe Lima		–	0.28	27.23	59.68 (6)	1:53.71 (2)
Butterfly	–	Giovanna Diamante		–	0.03	26.86	58.26 (7)	2:51.97 (6)
Freestyle	–	Stephanie Balduccini		–	0.14	26.05	54.77 (7)	– (–)
7	8	Hungary	HUN	3:47.15	–	–	– (–)	– (–)
Backstroke	–	Benedek Kovács		–	0.66	26.22	53.76 (1)	– (–)
Breaststroke	–	Petra Halmai		–	0.26	31.51	1:08.11 (8)	2:01.87 (8)
Butterfly	–	Richárd Márton		–	0.15	23.45	51.49 (3)	2:53.36 (8)
Freestyle	–	Fanni Gyurinovics		–	0.09	25.57	53.79 (4)	– (–)
DQ	1	Poland	POL	–	–	–	– (–)	– (–)
Backstroke	–	Paulina Peda		–	[0.59]	[29.20]	[1:00.83] ([8])	– (–)
Breaststroke	–	Jan Kozakiewicz		–	[0.12]	[27.16]	[59.28] ([5])	[2:00.11] ([7])
Butterfly	–	Jakub Majerski		–	[-0.05]	[23.62]	– (–)	[2:51.01] ([5])
Freestyle	–	Kornelia Fiedkiewicz		–	–	[26.03]	– (–)	– (–)

Heat #2

Time	20:35

Pos	Lane	Competitors	NOC	Time	Reaction Time	50 m Time	Split	Exchange
1	4	People's Republic of China	CHN	3:42.29	–	–	– (–)	– (–)	Q
Backstroke	–	Xu Jiayu		–	0.54	25.27	52.67 (1)	– (–)
Breaststroke	–	Yan Zibei		–	0.18	27.35	58.61 (2)	1:51.28 (1)
Butterfly	–	Zhang Yufei		–	0.53	26.20	57.37 (5)	2:48.65 (1)
Freestyle	–	Yang Junxuan		–	0.31	25.88	53.64 (=3)	– (–)
2	5	Australia	AUS	3:42.35	–	–	– (–)	– (–)	Q
Backstroke	–	Isaac Cooper		–	0.58	26.05	53.55 (4)	– (–)
Breaststroke	–	Zac Stubblety-Cook		–	0.41	27.81	58.80 (3)	1:52.35 (4)
Butterfly	–	Brianna Throssell		–	0.42	26.66	57.62 (7)	2:49.97 (4)
Freestyle	–	Bronte Campbell		–	0.21	25.22	52.38 (1)	– (–)
3	6	Italy	ITA	3:42.65	–	–	– (–)	– (–)	Q
Backstroke	–	Simone Sabbioni		–	0.60	26.16	53.96 (5)	– (–)
Breaststroke	–	Nicolò Martinenghi		–	0.17	27.07	58.38 (1)	1:52.34 (3)
Butterfly	–	Elena Di Liddo		–	0.28	26.29	57.29 (4)	2:49.63 (2)
Freestyle	–	Federica Pellegrini		–	0.11	25.36	53.02 (2)	– (–)
4	3	ROC	ROC	3:43.73	–	–	– (–)	– (–)	Q
Backstroke	–	Grigory Tarasevich		–	0.57	25.88	52.99 (2)	– (–)
Breaststroke	–	Kirill Prigoda		–	0.00	27.33	59.33 (5)	1:52.32 (2)
Butterfly	–	Arina Surkova		–	0.20	25.94	57.47 (6)	2:49.79 (3)
Freestyle	–	Mariya Kameneva		–	0.18	25.67	53.94 (6)	– (–)
5	8	Israel	ISR	3:43.94	–	–	– (–)	– (–)	Q
Backstroke	–	Anastasia Gorbenko		–	0.67	28.94	59.59 (8)	– (–)
Breaststroke	–	Itay Goldfaden		–	0.10	26.96	59.65 (6)	1:59.24 (7)
Butterfly	–	Gal Cohen Groumi		–	0.06	23.66	51.06 (2)	2:50.30 (5)
Freestyle	–	Andi Murez		–	0.21	25.35	53.64 (=3)	– (–)
6	2	Japan	JPN	3:44.15	–	–	– (–)	– (–)
Backstroke	–	Anna Konishi		–	0.52	28.92	59.58 (7)	– (–)
Breaststroke	–	Shoma Sato		–	0.18	27.91	59.84 (7)	1:59.42 (8)
Butterfly	–	Katsuhiro Matsumoto		–	0.15	23.82	50.95 (1)	2:50.37 (7)
Freestyle	–	Rikako Ikee		–	0.23	25.30	53.78 (5)	– (–)
7	7	Greece	GRE	3:44.77	–	–	– (–)	– (–)
Backstroke	–	Apostolos Christou		–	0.58	25.43	53.18 (3)	– (–)
Breaststroke	–	Konstantinos Meretsolias		–	0.26	27.63	1:00.10 (8)	1:53.28 (5)
Butterfly	–	Anna Ntountounaki		–	0.46	26.67	57.08 (3)	2:50.36 (6)
Freestyle	–	Nora Drakou		–	0.20	25.57	54.41 (7)	– (–)
8	1	Belarus	BLR	3:46.35	–	–	– (–)	– (–)
Backstroke	–	Mikita Tsmyh		–	0.61	26.40	54.88 (6)	– (–)
Breaststroke	–	Ilia Shymanovich		–	0.17	26.78	58.85 (4)	1:53.73 (6)
Butterfly	–	Anastasiya Kuliashova		–	0.03	26.42	58.12 (8)	2:51.85 (8)
Freestyle	–	Anastasiya Shkurdai		–	0.23	25.70	54.50 (8)	– (–)

Final Round

Date	31 July 2021 — 11:43

Pos	Lane	Competitors	NOC	Time	Reaction Time	50 m Time	Split	Exchange
1	4	Great Britain	GBR	3:37.58	–	–	– (–)	– (–)
Backstroke	–	Kathleen Dawson		–	0.62	28.35	58.80 (6)	– (–)
Breaststroke	–	Adam Peaty		–	0.12	26.18	56.78 (1)	1:55.58 (4)
Butterfly	–	James Guy		–	0.12	23.22	50.00 (1)	2:45.58 (1)
Freestyle	–	Anna Hopkin		–	0.23	24.66	52.00 (3)	– (–)
2	3	People's Republic of China	CHN	3:38.86	–	–	– (–)	– (–)
Backstroke	–	Xu Jiayu		–	0.54	25.33	52.56 (3)	– (–)
Breaststroke	–	Yan Zibei		–	0.21	26.96	58.11 (4)	1:50.67 (2)
Butterfly	–	Zhang Yufei		–	0.32	25.44	55.48 (5)	2:46.15 (2)
Freestyle	–	Yang Junxuan		–	0.26	25.04	52.71 (6)	– (–)
3	6	Australia	AUS	3:38.95	–	–	– (–)	– (–)
Backstroke	–	Kaylee McKeown		–	0.56	28.46	58.14 (5)	– (–)
Breaststroke	–	Zac Stubblety-Cook		–	0.20	27.60	58.82 (5)	1:56.96 (5)
Butterfly	–	Matthew Temple		–	0.29	23.55	50.26 (2)	2:47.22 (4)
Freestyle	–	Emma McKeon		–	0.26	24.88	51.73 (2)	– (–)
4	2	Italy	ITA	3:39.28	–	–	– (–)	– (–)
Backstroke	–	Thomas Ceccon		–	0.65	25.65	52.23 (=1)	– (–)
Breaststroke	–	Nicolò Martinenghi		–	0.20	27.16	57.73 (2)	1:49.96 (1)
Butterfly	–	Elena Di Liddo		–	0.16	26.49	56.62 (7)	2:46.58 (3)
Freestyle	–	Federica Pellegrini		–	0.32	25.29	52.70 (5)	– (–)
5	5	United States	USA	3:40.58	–	–	– (–)	– (–)
Backstroke	–	Ryan Murphy		–	0.51	25.09	52.23 (=1)	– (–)
Breaststroke	–	Lydia Jacoby		–	0.32	29.99	1:05.09 (8)	1:57.32 (6)
Butterfly	–	Torri Huske		–	0.10	25.41	56.27 (6)	2:53.59 (8)
Freestyle	–	Caeleb Dressel		–	0.06	22.15	46.99 (1)	– (–)
6	7	Netherlands	NED	3:41.25	–	–	– (–)	– (–)
Backstroke	–	Kira Toussaint		–	0.50	28.41	59.45 (7)	– (–)
Breaststroke	–	Arno Kamminga		–	0.29	26.61	57.89 (3)	1:57.34 (7)
Butterfly	–	Nyls Korstanje		–	0.18	22.82	51.34 (3)	2:48.68 (5)
Freestyle	–	Femke Heemskerk		–	0.33	24.91	52.57 (4)	– (–)
7	1	ROC	ROC	3:42.45	–	–	– (–)	– (–)
Backstroke	–	Yevgeny Rylov		–	0.54	26.06	52.79 (4)	– (–)
Breaststroke	–	Kirill Prigoda		–	0.04	27.40	59.15 (6)	1:51.94 (3)
Butterfly	–	Svetlana Chimrova		–	0.19	26.06	56.95 (8)	2:48.89 (6)
Freestyle	–	Mariya Kameneva		–	0.20	25.74	53.56 (7)	– (–)
8	8	Israel	ISR	3:44.77	–	–	– (–)	– (–)
Backstroke	–	Anastasia Gorbenko		–	0.70	29.08	59.55 (8)	– (–)
Breaststroke	–	Itay Goldfaden		–	0.09	27.05	59.86 (7)	1:59.41 (8)
Butterfly	–	Gal Cohen Groumi		–	0.23	23.84	51.58 (4)	2:50.99 (7)
Freestyle	–	Andi Murez		–	0.26	25.91	53.78 (8)	– (–)