Swimming at the 2016 Summer Olympics – Women's 100 metre butterfly
| Women's 100 metre butterfly at the Games of the XXXI Olympiad
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| Venue | Olympic Aquatics Stadium | ||||||||||||
| Dates | 6 August 2016 (heats & semifinals) 7 August 2016 (final) |
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| Competitors | 45 from 35 nations | ||||||||||||
| Winning time | 55.48 WR | ||||||||||||
| Medalists | |||||||||||||
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Sarah Sjöström |
 Sweden
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Penny Oleksiak |
 Canada
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Dana Vollmer |
 United States
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The women's 100 metre butterfly event at the 2016 Summer Olympics took place on 6–7 August at the Olympic Aquatics Stadium.
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 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.
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.
Prior to this competition, the existing world and Olympic records were as follows.
The following records were established during the competition:
Chen - On 10 December 2016, FINA confirmed that Chen had tested positive for unlawful subnstances at the Games. Her results were voided, and she was given a two year ban from competing.
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