Sonya Richards of the USA sprints towards the second place in the Women's 400 meter final at the World Athletics Championships in Helsinki, Wednesday Aug. 10, 2005. Tonique Williams-Darling of the Bahamas won the race. ALASTAIR GRANT / ASSOCIATED PRESS

US flagbearer Mariel Zagunis leads her delegation during the opening ceremony of the London 2012 Olympic Games on July 28, 2012 at the Olympic Stadium in London. ADRIAN DENNIS / AFP/Getty Images

Anna Tunnicliffe of the U.S. is shown Thursday, Jan. 26, 2006 in Miami, during the 470 women's laser radial class Rolex Miami OCR 2006 boat race, in the fourth day of racing, where 610 sailors from 40 countries are competing, during the Olympic preparation regatta. DAN NERNEY / ASSOCIATED PRESS

Gold medalists Venus, left, and Serena Williams hold hands during the medal ceremony in women's doubles tennis during the Beijing 2008 Olympics in Beijing, Sunday, Aug. 17, 2008. Charles Krupa / AP

Team USA's Sylvia Fowles grabs a rebound over WNBA All-Stars' Penny Taylor during the second half of the USA's 99-72 victory in their basketball game in Uncasville, Conn., on Saturday, July 10, 2010. Fowles scored a game-high 23 points and had eight rebounds in the game. Fred Beckham / AP

U.S. gymnast Gabrielle Douglas performs on the uneven bars during the Artistic Gymnastics women's qualification at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. Gregory Bull / AP

Bernice Sandler

United States' 75-kg middleweight boxer Claressa Shields warms up during a practice session at the 2012 Summer Olympics, Thursday, July 26, 2012, in London. Patrick Semansky / AP