Jamaica's Usain Bolt gestures as he crosses the finish line to win gold in the men's 200-meter final during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Thursday, Aug. 9, 2012. (AP Photo/David J. Phillip)

Jamaica's Usain Bolt, center, is embraced by his mother Jennifer, center left, after he won gold in the men's 200-meter final during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Thursday, Aug. 9, 2012. (AP Photo/David J. Phillip)

Jamaica's Usain Bolt wins the finals of the men's 200-meter in the Olympic Stadium at the 2012 Summer Olympics, London, Thursday, Aug. 9, 2012. (AP Photo/Morry Gash)

Jamaica's Usain Bolt celebrates winning gold in the men's 200-meter final during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Thursday, Aug. 9, 2012. (AP Photo/David J. Phillip)

Jamaica's gold medal winner Usain Bolt, center, celebrates with his teammate Warren Weir, left, and Yohan Blake after the men's 200-meter final during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Thursday, Aug. 9, 2012. (AP Photo/Lee Jin-man)

United States' Christie Rampone (3) celebrates with teammate Hope Solo (1) after winning the women's soccer gold medal match against Japan at the 2012 Summer Olympics, Thursday, Aug. 9, 2012, in London. (AP Photo/Julie Jacobson)

United States' Carli Lloyd (10) celebrates after scoring against Japan goalkeeper Miho Fukumoto (1) during the women's soccer gold medal match at the 2012 Summer Olympics, Thursday, Aug. 9, 2012, in London. (AP Photo/Andrew Medichini)

United States' Ashton Eaton is embraced by his fiancee Brianne Theisen after winning gold in the decathlon following the 1500-meter race during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Thursday, Aug. 9, 2012. (AP Photo/Matt Dunham)

United States' Ashton Eaton clears the bar in the decathlon pole vault during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Thursday, Aug. 9, 2012. (AP Photo/David J. Phillip )

United States' Trey Hardee runs to take a jump in the decathlon pole vault during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Thursday, Aug. 9, 2012. (AP Photo/Matt Dunham)

In this multiple exposure photo, Canada's Damian Warner competes in the men's decathlon pole vault during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Thursday, Aug. 9, 2012. (AP Photo/David J. Phillip )

China's Ren Cancan, is knocked down by Great Britain's Nicola Adams, blue, during their women's final flyweight 51-kg boxing match at the 2012 Summer Olympics, Thursday, Aug. 9, 2012, in London. (AP Photo/Mark Duncan)

China's Ren Cancan, is knocked down by Great Britain's Nicola Adams, blue, during their women's final flyweight 51-kg gold medal boxing match at the 2012 Summer Olympics, Thursday, Aug. 9, 2012, in London. (AP Photo/Ivan Sekretarev)

Ireland's Katie Taylor, celebrates winning her fight against Russia's Sofya Ochigava, in a women's lightweight 60-kg gold medal boxing match at the 2012 Summer Olympics, Thursday, Aug. 9, 2012, in London. (AP Photo/Patrick Semansky)

Kelsey Campbell of the United States reacts after losing to Yuliya Ratkevich of Azerbaijan during the 55-kg women's freestyle wrestling competition at the 2012 Summer Olympics, Thursday, Aug. 9, 2012, in London. (AP Photo/Paul Sancya)

The United States team gathers at half court after beating Australia in a women's basketball semifinal game at the 2012 Summer Olympics, Thursday, Aug. 9, 2012, in London. (AP Photo/Victor R. Caivano)

United States' Diana Taurasi, right, charges into Australia's Belinda Snell, left, during a women's semifinals basketball game at the 2012 Summer Olympics, Thursday, Aug. 9, 2012, in London. (AP Photo/Charles Krupa)

In this photo taken with a fisheye lens, Britain women's water polo players huddle before the seventh place water polo match at the 2012 Summer Olympics, Thursday, Aug. 9, 2012, in London. (AP Photo/Julio Cortez)

Germany's Angela Maurer, front, and other athletes dive into the Serpentine at Hyde Park as they compete in the women's marathon swimming competition at the 2012 Summer Olympics Thursday, Aug. 9, 2012, in London. (AP Photo/Charlie Riedel)

Cyclists compete in a BMX cycling men's quarterfinal run during the 2012 Summer Olympics, Thursday, Aug. 9, 2012, in London. (AP Photo/Matt Rourke)

New Zealand's Marc Willers competes in a BMX cycling men's quarterfinal run at the 2012 Summer Olympics in London, Thursday, Aug. 9, 2012. (AP Photo/Sergey Ponomarev)

Charlotte Dujardin, of Great Britain, exits the arena after completing her routine with her horse Valegro to win the gold medal in the equestrian dressage individual competition at the 2012 Summer Olympics, Thursday, Aug. 9, 2012, in London. (AP Photo/David Goldman)

Sand falls from the boot of Edward Gal, of the Netherlands, as he rides his horse Undercover in the equestrian dressage individual competition at the 2012 Summer Olympics, Thursday, Aug. 9, 2012, in London. (AP Photo/David Goldman)