United States' Carmelita Jeter reacts as she crosses the finish line to win the women's 4 x 100-meter relay during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Friday, Aug. 10, 2012. The United States relay team set a new world record with a time of 40.82 seconds.(AP Photo/Anja Niedringhaus)

United States' women's 4 x100-meter relay team members, from left, Tianna Madison, Bianca Knight, Carmelita Jeter and Allyson Felix, celebrate their gold medal win during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Friday, Aug. 10, 2012. The United States relay team set a new world record with a time of 40.82 seconds.(AP Photo/Lee Jin-man)

Russia's Misha Aloian, right, fights Mongolia's Tugstsogt Nyambayar, during their men's flyweight 52-kg semifinal boxing match at the 2012 Summer Olympics, Friday, Aug. 10, 2012, in London. (AP Photo/Ivan Sekretarev)

Gold-medalist Oussama Mellouli, from Tunisia, competes in the men's 10-kilometer swimming marathon in Hyde Park at the 2012 Summer Olympics Friday, Aug. 10, 2012, in London. (AP Photo/Charlie Riedel)

Ethiopia's Meseret Defar reacts as she crosses the finish line to win the 5000-meter final during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Friday, Aug. 10, 2012. (AP Photo/Anja Niedringhaus)

Ethiopia's Meseret Defar holds up a picture to her face after she won gold in the women's 5000-meter final during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Friday, Aug. 10, 2012. (AP Photo/Matt Dunham)

The Netherlands' Sophie Polkamp, top, and Argentina's Sofia Maccari fight for the ball during a women's hockey gold medal match at the 2012 Summer Olympics, London, Friday, Aug. 10, 2012. (AP Photo/Jae C. Hong)

New Zealand's players leave the field after loosing to Britain in the women's field hockey bronze medal match at the 2012 Summer Olympics, Friday, Aug. 10, 2012, in London. (AP Photo/Eranga Jayawardena)

Deni Fioretnini of Italy, right, struggles for position with Dusko Pijetlovic of Sebia during their men's semifinal water polo match at the 2012 Summer Olympics, Friday, Aug. 10, 2012, in London. (AP Photo/Alastair Grant)

Spain's Pau Gasol (4) and teammate Felipe Reyes (9) celebrate their win over Russia in a semifinal men's basketball game at the 2012 Summer Olympics, Friday, Aug. 10, 2012, in London. Russia's Vitaliy Fridzon is at right.(AP Photo/Eric Gay)

Spain's Pau Gasol, left, scores past Russia's Andrei Kirilenko during a men's basketball semifinal game at the 2012 Summer Olympics, Friday, Aug. 10, 2012, in London. (AP Photo/Victor R. Caivano)

Spain's Igor Bychkov is hit by his pole as he fails to launch himself in the men's pole vault final during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Friday, Aug. 10, 2012. (AP Photo/David J. Phillip)

Germany's Ronald Rahue paddles in a men's kayak single 200m heat in Eton Dorney, near Windsor, England, at the 2012 Summer Olympics, Friday, Aug. 10, 2012. (AP Photo/Natacha Pisarenko)

The team from China competes during the synchronized swimming team free routine final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Friday, Aug. 10, 2012. China took the silver medal in the event. (AP Photo/Mark J. Terrill)

Australia's crew Mathew Belcher and Malcolm Page, foreground, celebrate after winning the gold medal of the 470 men's class sailing competition at the London 2012 Summer Olympics, Friday, Aug. 10, 2012, in Weymouth and Portland, England. (AP Photo/Bernat Armangue)

Colombia's Andres Eduardo Jimenez Caicedo competes in a BMX cycling men's semifinal run during the 2012 Summer Olympics in London, Friday, Aug. 10, 2012. (AP Photo/Christophe Ena)