(R-L) Madeline Dirado of the United States and Katinka Hosszu of Hungary compete in the Women's 200m Backstroke Final on Day 7 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 12, 2016 in Rio de Janeiro, Brazil.

Nanjing 2014 - Gold metalists Hannah Moore (R) of United States of America and Ambra Esposito of Italy and bronze metalist Africa Zamorano Sanz of Spain pose on the podium after women's 200m backstroke final event at the Nanjing 2014 Youth Olympic Games in Nanjing, east China's Jiangsu Province, Aug. 19, 2014. Petrova won the silver medal.

25 SEP 1988: KRISZTINA EGERSZEGI OF HUNGARY WAVES TO THE CROWD AFTER RECEIVING HER GOLD MEDAL IN THE WOMENS 200 METRE BACKSTROKE FINAL AT THE 1988 SEOUL OLYMPICS. EGERSZEGI WON IN AN OLYMPIC RECORD SETTING TIME OF 2:09.29 MINUTES.

ATHENS - AUGUST 20: Antje Buschschulte of Germany swims in the women's swimming 200 metre backstroke final on August 20, 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 *** Antje Buschschulte

Mitch Larkin of Australia competes in the Men's 200m Backstroke Final on Day 6 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 11, 2016 in Rio de Janeiro, Brazil.

Evgeny Rylov of Russian Federation competes in the Men's 200m Backstroke Final on Day 6 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 11, 2016 in Rio de Janeiro, Brazil.

(L-R) Silver medalist Mitch Larkin of Australia, gold medalist Ryan Murphy of the United States and bronze medalist Evgeny Rylov of Russian Federation celebrate on the podium after the Men's 200m Backstroke Final on Day 6 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 11, 2016 in Rio de Janeiro, Brazil.

Evgeny Rylov of Russian Federation competes in the Men's 200m Backstroke Final on Day 6 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 11, 2016 in Rio de Janeiro, Brazil.

Ryan Murphy of the United States competes in the Men's 200m Backstroke Final on Day 6 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 11, 2016 in Rio de Janeiro, Brazil.

Ryan Murphy of the United States celebrates after winning gold in the Men's 200m Backstroke Final on Day 6 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 11, 2016 in Rio de Janeiro, Brazil.