Joseph Schooling of Singapore (R) and Chad Guy Bertrand le Clos of South Africa swim in the Men's 100m Butterfly Final on Day 7 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 12, 2016 in Rio de Janeiro, Brazil.

Natsumi Hoshi of Japan, Katarina Listopadova of Slovakia and Daynara de Paula of Brazil compete in heat three of the Women's 100m Butterfly on Day 1 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 6, 2016 in Rio de Janeiro, Brazil.

27 JUL 1992: ANTHONY NESTY OF SURINAM IN ACTION DURING THE MENS 100M BUTTERFLY FINAL AT THE 1992 BARCELONA OLYMPICS. NESTY WON THE BRONZE MEDAL WITH A TIME OF 53.41 SECONDS.

ATHENS - AUGUST 14: Inge de Bruijn of Netherlands competes in the women's swimming 100 metre butterfly heat on August 14, 2004 during the Athens 2004 Summer Olympic Games at the Main Pool of the Olympic Sports Complex Aquatic Centre in Athens, Greece. (Photo by Shaun Botterill/Getty Images) *** Local Caption *** Inge de Bruijn

ATHENS - AUGUST 15: Inge de Bruijn of USA competes in the women's swimming 100 metre butterfly final on August 15, 2004 during the Athens 2004 Summer Olympic Games at the Main Pool of the Olympic Sports Complex Aquatic Centre in Athens, Greece. (Photo by Daniel Berehulak/Getty Images for FINA) *** Local Caption *** Inge de Bruijn

Nanjing 2014 - Gold medalist Liliana Szilagyl (C) of Hungary, silver medalist Zhang Yufei (L) of China and bronze medalist Brianna Throssell of Australia on the podium during the awarding ceremony of the Women's 100m Butterfly of swimming at Nanjing 2014 Youth Olympic Games in Nanjing, Jiangsu Province, Aug. 22, 2014.

Nanjing 2014 - Liliana Szilagyl of Hungary competes during the Women's 100m Butterfly final match of swimming event at Nanjing 2014 Youth Olympic Games in Nanjing, east China's Jiangsu Province, on August 22, 2014. Liliana Szilagyl won the gold medal.

Nanjing 2014 - Zhang Yufei of China competes during the Women's 100m Butterfly final match of swimming event at Nanjing 2014 Youth Olympic Games in Nanjing, Jiangsu Province, on August 22, 2014. Zhang Yufei won the silver medal.

Nanjing 2014 - Gold medalist Liliana Szilagyl of Hungary celebrates during the awarding ceremony of the Women's 100m Butterfly of swimming at Nanjing 2014 Youth Olympic Games in Nanjing, Jiangsu Province, Aug. 22, 2014.

Nanjing 2014 - Liliana Szilagyl of Hungary celebrates after winning the Women's 100m Butterfly final match of swimming event at Nanjing 2014 Youth Olympic Games in Nanjing, Jiangsu Province, on August 22, 2014. Liliana Szilagyl won the gold medal.