Oussama Mellouli of Tunisia competes in the Men's Marathon 10km swim on Day 14 of the London 2012 Olympic Games at Hyde Park on August 10, 2012 in London, England. (Photo by Alexander Hassenstein/Getty Images)

Olympic 10km Open Water (Men)

The men’s and women’s 10km Open Water swim will be must-see events as swimmers will race in the Seine River in the first point-to-point open water races at an Olympics since the first time the Games were held in Paris in 1900.

Joanna Zachoszcz of Poland competes in the Women's 10km Marathon Swimming on day 10 of the Rio 2016 Olympic Games at Fort Copacabana on August 15, 2016 in Rio de Janeiro, Brazil. (Photo by Clive Rose/Getty Images)

Olympic 10km Open Water (Women)

The men’s and women’s 10km Open Water swim will be must-see events as swimmers will race in the Seine River in the first point-to-point open water races at an Olympics since the first time the Games were held in Paris in 1900.