| | Event type

400 metres Breaststroke, Men

Date	22 – 25 August 1920
Status	Olympic
Location	Zwemstadion van Antwerpen, Antwerpen
Participants	20 from 10 countries

Sweden’s Håkan Malmrot swam comfortably in his heat, barely edging out Finland’s Arvo Aaltonen. But then in the semi-finals, he won by over 21 seconds and his margin in the final was a dominating 14 seconds. This was the last time this event was contested at the Olympics.

Pos	Swimmer	NOC	R1	SF	Final
1	Håkan Malmrot	SWE	6:49.0 (1 h2)	6:44.8 (1 h1)	6:31.8 (1)	Gold
2	Thor Henning	SWE	6:46.2 (1 h1)	6:45.0 (=1 h2)	6:45.2 (2)	Silver
3	Arvo Aaltonen	FIN	6:50.0 (2 h2)	6:45.0 (=1 h2)	6:48.0 (3)	Bronze
4	Jack Howell	USA	6:57.0 (1 h3)	6:51.4 (3 h2)	6:51.0 (4)
5	Per Cederblom	SWE	7:14.0 (2 h3)	7:05.6 (2 h1)	– (5)
3 h1 r2/3	Mike McDermott	USA	7:12.8 (3 h1)	7:13.2 (3 h1)	–
4 h1 r2/3	Henri Demiéville	SUI	7:12.4 (2 h4)	– (4 h1)	–
4 h2 r2/3	Olle Dickson	SWE	7:12.0 (1 h4)	6:59.0 (4 h2)	–
5 h2 r2/3	Lucien Lebaillif	FRA	7:12.2 (2 h1)	– (5 h2)	–
3 h2 r1/3	Félicien Courbet	BEL	7:20.0 (3 h2)	–	–
3 h3 r1/3	George Robertson	GBR	7:28.0 (3 h3)	–	–
3 h4 r1/3	Stephen Ruddy	USA	7:13.0 (3 h4)	–	–
4 h1 r1/3	Rex Lassam	GBR	– (4 h1)	–	–
4 h2 r1/3	Charles Quinby	USA	– (4 h2)	–	–
4 h3 r1/3	Émile Arbogast	FRA	– (4 h3)	–	–
4 h4 r1/3	Édouard Van Haelen	BEL	– (4 h4)	–	–
5 h3 r1/3	Edmond Henry	BEL	– (5 h3)	–	–
5 h4 r1/3	Eduard Stibor	TCH	– (5 h4)	–	–
AC h1 r1/3	Sydney Gooday	CAN	– (DNF h1)	–	–		DNF
AC h2 r1/3	Luis Balcells	ESP	– (DNF h2)	–	–		DNF

Round One (22 – 23 August 1920 — 16:30)

Top two in each heat and the fastest third-place advanced to the semi-finals.

Heat One

Pos	Lane	Swimmer	NOC	Time
1	–	Thor Henning	SWE	– (–) –	6:46.2	Q
2	–	Lucien Lebaillif	FRA	– (–) –	7:12.2	Q
3	–	Mike McDermott	USA	– (–) –	7:12.8	q
4	–	Rex Lassam	GBR	– (–) –	–
DNF	–	Sydney Gooday	CAN	– (–) –	–		1

Heat Two

Pos	Lane	Swimmer	NOC	Time
1	–	Håkan Malmrot	SWE	– (–) –	6:49.0	Q
2	–	Arvo Aaltonen	FIN	– (–) –	6:50.0	Q
3	–	Félicien Courbet	BEL	– (–) –	7:20.0
4	–	Charles Quinby	USA	– (–) –	–
DNF	–	Luis Balcells	ESP	– (–) –	–		2

Heat Three

Pos	Lane	Swimmer	NOC	Time
1	–	Jack Howell	USA	– (–) –	6:57.0	Q
2	–	Per Cederblom	SWE	– (–) –	7:14.0	Q
3	–	George Robertson	GBR	– (–) –	7:28.0
4	–	Émile Arbogast	FRA	– (–) –	–
5	–	Edmond Henry	BEL	– (–) –	–

Heat Four

Pos	Lane	Swimmer	NOC	Time
1	–	Olle Dickson	SWE	– (–) –	7:12.0	Q
2	–	Henri Demiéville	SUI	– (–) –	7:12.4	Q
3	–	Stephen Ruddy	USA	– (–) –	7:13.0
4	–	Édouard Van Haelen	BEL	– (–) –	–
5	–	Eduard Stibor	TCH	– (–) –	–

Semi-Finals (24 August 1920 — 16:00)

Top two in each heat and the fastest third-place advanced to the final.

Heat One

Pos	Lane	Swimmer	NOC	Time
1	–	Håkan Malmrot	SWE	– (–) –	6:44.8	Q
2	–	Per Cederblom	SWE	– (–) –	7:05.6	Q
3	–	Mike McDermott	USA	– (–) –	7:13.2
4	–	Henri Demiéville	SUI	– (–) –	–

Heat Two

Pos	Lane	Swimmer	NOC	Time
=1	–	Thor Henning	SWE	– (–) –	6:45.0	Q
=1	–	Arvo Aaltonen	FIN	– (–) –	6:45.0	Q
3	–	Jack Howell	USA	– (–) –	6:51.4	q
4	–	Olle Dickson	SWE	– (–) –	6:59.0
5	–	Lucien Lebaillif	FRA	– (–) –	–

Final (25 August 1920 — 16:15)

Pos	Lane	Swimmer	NOC	Time
1	–	Håkan Malmrot	SWE	– (–) –	6:31.8
2	–	Thor Henning	SWE	– (–) –	6:45.2
3	–	Arvo Aaltonen	FIN	– (–) –	6:48.0
4	–	Jack Howell	USA	– (–) –	6:51.0
5	–	Per Cederblom	SWE	– (–) –	–