Swimming at the 2016 Summer Olympics – Women's 100 metre butterfly

Women's 100 metre butterfly at the Games of the XXXI Olympiad
Venue	Olympic Aquatics Stadium
Dates	6 August 2016 (heats & semifinals) 7 August 2016 (final)
Competitors	45 from 35 nations
Winning time	55.48 WR
Medalists
Sarah Sjöström  Schweden Penny Oleksiak  Kanada Dana Vollmer  Vereinigte Staaten

The women's 100 metre butterfly event at the 2016 Summer Olympics took place on 6–7 August at the Olympic Aquatics Stadium.

Summary

Swedish swimmer Sarah Sjöström overturned her own existing world record to become the country's first Olympic champion in the pool since Lars Frölander topped the podium on the male counterpart of this event in 2000. She maintained an enormous lead from the start to capture her first Olympic gold medal with a 55.48, shaving 0.16 seconds off from her own world record. Canada's 16-year-old Penny Oleksiak came from third at the initial length to smash a new junior World and Canadian record for the silver in 56.46, touching out U.S. swimmer and reigning Olympic titleholder Dana Vollmer, who claimed the bronze in 56.63, by just 0.17 of a second.

Chinese teammates Chen Xinyi (56.72) and London 2012 runner-up Lu Ying (56.76) picked up the fourth and fifth spots respectively, separated by 0.04-second margin. Meanwhile, teenager Rikako Ikee cracked a 57-second barrier with a Japanese record and a sixth-place finish in 56.86. Australia's Emma McKeon (57.05) and Denmark's four-time Olympian Jeanette Ottesen (57.17) rounded out the championship field. In December 2016, Chen Xinyi was disqualified after failing a drugs test.

Earlier in the semifinals, Sjöström established a new Olympic record time of 55.84 to take the top seed for a historic finale, slicing 0.14 seconds off from the standard held by Vollmer at the previous Games.

The medals for the competition were presented by Gunilla Lindberg, Sweden, IOC member, and the gifts were presented by Mr. Pipat Paniangvait, Honorary Treasurer of the FINA.

Records

Prior to this competition, the existing world and Olympic records were as follows.

World record	Sarah Sjöström (SWE)	55.64	Kazan, Russia	3 August 2015
Olympic record	Dana Vollmer (USA)	55.98	London, United Kingdom	29 July 2012

The following records were established during the competition:

Date	Event	Name	Nationality	Zeit	Record
6 August	Semifinal	Sarah Sjöström	Schweden	55.84	OR
7 August	Final	Sarah Sjöström	Schweden	55.48	WR, OR

Competition format

The competition consisted of three rounds: heats, semifinals, and a final. The swimmers with the best 16 times in the heats advanced to the semifinals. The swimmers with the best 8 times in the semifinals advanced to the final. Swim-offs were used as necessary to break ties for advancement to the next round.

Results

Heats

Rank	Heat	Lane	Name	Nationality	Zeit	Notes
1	6	4	Sarah Sjöström	Schweden	56.26	Q
2	4	5	Dana Vollmer	Vereinigte Staaten	56.56	Q
3	6	3	Penny Oleksiak	Kanada	56.73	Q, WJR, NR
4	5	4	Kelsi Dahlia	Vereinigte Staaten	56.97	Q
5	6	6	Lu Ying	China	57.08	Q
6	6	5	Jeanette Ottesen	Dänemark	57.15	Q
7	4	4	Chen Xinyi	China	57.17	Q
8	6	2	Rikako Ikee	Japan	57.27	Q, NR
9	5	5	Emma McKeon	Australien	57.33	Q
10	4	6	Liliána Szilágyi	Ungarn	57.70	Q
11	5	2	An Se-hyeon	Südkorea	57.80	Q
12	4	7	Farida Osman	Ägypten	57.83	Q, AF
13	4	8	Kimberly Buys	Belgien	57.91	Q
14	3	5	Daynara de Paula	Brasilien	57.92	Q
15	3	3	Natsumi Hoshi	Japan	58.15	Q
	5	7	Daiene Dias	Brasilien		Q
17	4	3	Madeline Groves	Australien	58.17
18	4	1	Anna Ntountounaki	Griechenland	58.27
	5	3	Noemie Thomas	Kanada
20	6	7	Svetlana Chimrova	Russland	58.41
21	5	6	Ilaria Bianchi	Italien	58.48
22	4	2	Alexandra Wenk	Deutschland	58.49
23	6	8	Kristel Vourna	Griechenland	58.89
24	5	8	Marie Wattel	Frankreich	58.90
25	3	6	Béryl Gastaldello	Frankreich	58.93
26	6	1	Nataliya Lovtsova	Russland	59.19
27	2	4	Amit Ivry	Israel	59.42
28	3	7	Lucie Svěcená	Tschechische Republik	59.45
	3	8	Danielle Villars	Schweiz
30	3	4	Katarína Listopadová	Slowakei	59.57
31	3	1	Judit Ignacio	Spanien	59.61
32	5	1	Louise Hansson	Schweden	59.73
33	3	2	Helena Gasson	Neuseeland	59.82
34	2	3	Darya Stepanyuk	Ukraine	1:00.81
35	2	5	Quah Ting Wen	Singapur	1:00.88
36	2	2	Amina Kajtaz	Bosnien und Herzegowina	1:01.67
37	2	6	Marie Laura Meza	Costa Rica	1:02.01
38	2	7	Sotiria Neofytou	Zypern	1:02.91
39	2	1	Jannah Sonnenschein	Mosambik	1:04.21
40	2	8	Dalia Tórrez Zamora	Nicaragua	1:05.81
41	1	4	Yusra Mardini	Refugee Olympic Team	1:09.21
42	1	5	Oreoluwa Cherebin	Grenada	1:10.40
43	1	6	Nooran Ba Matraf	Jemen	1:11.16
44	1	3	Johanna Umurungi	Ruanda	1:11.92
45	1	2	Nada Arkaji	Katar	1:18.86

Semifinals

Semifinal 1

Rank	Lane	Name	Nationality	Zeit	Notes
1	6	Rikako Ikee	Japan	57.05	Q, NR
2	4	Dana Vollmer	Vereinigte Staaten	57.06	Q
3	3	Jeanette Ottesen	Dänemark	57.47	Q
4	5	Kelsi Dahlia	Vereinigte Staaten	57.54
5	7	Farida Osman	Ägypten	58.26
6	2	Liliána Szilágyi	Ungarn	58.31
7	8	Daiene Dias	Brasilien	58.52
8	1	Daynara de Paula	Brasilien	58.65

Semifinal 2

Rank	Lane	Name	Nationality	Zeit	Notes
1	4	Sarah Sjöström	Schweden	55.84	Q, OR
2	2	Emma McKeon	Australien	56.81	Q
3	5	Penny Oleksiak	Kanada	57.10	Q
4	3	Lu Ying	China	57.15	Q
5	6	Chen Xinyi	China	57.51	Q
6	7	An Se-hyeon	Südkorea	57.95
7	8	Natsumi Hoshi	Japan	58.03
8	1	Kimberly Buys	Belgien	58.63

Final

Rank	Lane	Name	Nationality	Zeit	Notes
	4	Sarah Sjöström	Schweden	55.48	WR
	2	Penny Oleksiak	Kanada	56.46	WJR, NR
	6	Dana Vollmer	Vereinigte Staaten	56.63
4	7	Lu Ying	China	56.76
5	3	Rikako Ikee	Japan	56.86	NR
6	5	Emma McKeon	Australien	57.05
7	1	Jeanette Ottesen	Dänemark	57.17
[a]	8	Chen Xinyi	China	DSQ

^Chen - On 10 December 2016, FINA confirmed that Chen, who had originally placed 4th, tested positive for unlawful substances at the Games. Her results were voided, and she was given a two year ban from competing.