Francesca Halsall of Great Britain competes in the Women's 50m Freestyle Final on Day 8 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 13, 2016 in Rio de Janeiro, Brazil.

Cate Campbell of Australia prepares ahead of the Women's 50m Freestyle Final on Day 8 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 13, 2016 in Rio de Janeiro, Brazil.

Anthony Ervin of the United States celebrates winning gold in the Men's 50m Freestyle Final on Day 7 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 12, 2016 in Rio de Janeiro, Brazil.

Ranomi Kromowidjojo of the Netherlands competes in the Women's 50m Freestyle Final on Day 8 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 13, 2016 in Rio de Janeiro, Brazil.

Silver medalist Simone Manuel of the United States, Gold medalist Pernille Blume of Denmark and Bronze medalist Aliaksandra Herasimenia of Belarus pose during the medal ceremony for the Women's 50m Freestyle Final on Day 8 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 13, 2016 in Rio de Janeiro, Brazil.

(L-R) Pernille Blume of Denmark and Ranomi Kromowidjojo of the Netherlands compete in the Women's 50m Freestyle Final on Day 8 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 13, 2016 in Rio de Janeiro, Brazil.

Nanjing 2014 - Gold medalist Rozaliya Nasretdinova of Russian Federation, silver medalist Ami Matsuo of Australia and bronze medalist Daria Ustinova of Russian Federation pose on the podium during the awarding ceremony of Women's 50m Freestyle of Nanjing 2014 Youth Olympic Games in Nanjing, capital of Jiangsu Province, on August 22, 2014.

Nanjing 2014 - Rozaliya Nasretdinova of Russian Federation celebrates after the Women's 50m Freestyle competition of Nanjing 2014 Youth Olympic Games in Nanjing, capital of Jiangsu Province, on August 22, 2014. Rozaliya Nasretdinova won the gold.

Nanjing 2014 - Yu Hexin(2nd,L)of China competes during the Men's 50m Freestyle match at Nanjing 2014 Youth Olympic Games in Nanjing, capital of Jiangsu Province, on Aug. 20, 2014. Yu Hexin of China won the gold medal.

Nanjing 2014 - Victory Ceremony for the Men’s 50 m free style is held at the Natatorium of Nanjing Olympic Sports Centre, 20 August 2014. Gold, Yu Hexin of China (c), Silver Matheus Paulo de Santana of Brazil (L), Bronze Dylan Carter of Trinidad and Tobago (R).