London Olympics Canoe Sprint Women

Carrie Johnson failed to qualify for the 500m kayak finals. (Natacha Pisarenko/AP)

Carrie Johnson failed to qualify for the 500m kayak finals. (Natacha Pisarenko/AP)

U.S. kayaker Carrie Johnson paddles in a women’s kayak single 500m heat in Eton Dorney, near Windsor, England, at the 2012 Summer Olympics, Tuesday, Aug. 7, 2012. (AP Photo/Natacha Pisarenko)