Britain's Mohamed Farah celebrates as he crosses the finish line to win the men's 5000-meter final during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Saturday, Aug. 11, 2012.(AP Photo/Anja Niedringhaus)

Jamaica's Usain Bolt leads United States' Ryan Bailey to win the men's 4 x 100-meter relay final during the athletics in the Olympic Park during the 2012 Summer Olympics, Saturday, Aug. 11, 2012, in London. Jamaica set a new world record with a time of 36.84 seconds.(AP Photo/Anja Niedringhaus)

Britain's James Tindall reacts after a men's hockey bronze medal match Against Australia at the 2012 Summer Olympics, in London, Saturday, Aug. 11, 2012. Australia won the match. (AP Photo/Jae C. Hong)

Thailand's Kaeo Pongprayoon, in blue, lies on the mat after losing to China's Zou Shiming in the men's light flyweight 49kg boxing gold medal match at the 2012 Summer Olympics, Saturday, Aug. 11, 2012, in London. (AP Photo/Mark Duncan)

United States' Deedee Trotter, right, United States' Sanya Richards-Ross, front center and United States' Allyson Felix, back left, celebrate winning gold in the women's 4x400-meter relay final during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Saturday, Aug. 11, 2012. (AP Photo/David J. Phillip )

Hwang Woojin, of South Korea, and his horse Shearwater Oscar, fall down after the horse bucked after the starting bell sounded to start their run in the equestrian show jumping stage of the men's modern pentathlon at the 2012 Summer Olympics, Saturday, Aug. 11, 2012, in London. (AP Photo/David Goldman)

USA's Foluke Akinradewo (16, right) cries as she hugs teammate Jordan Larson (10) after losing to Brazil 3-1 during a women's volleyball gold medal match at the 2012 Summer Olympics Saturday, Aug. 11, 2012, in London. (AP Photo/Chris O'Meara)

Britain's Samuel Weale looks up during the fencing section of the men's modern pentathlon at the 2012 Summer Olympics, Saturday, Aug. 11, 2012, in London. (AP Photo/Kirsty Wigglesworth)

Russia's Daria Dmitrieva performs during the rhythmic gymnastics individual all-around final at the 2012 Summer Olympics, Saturday, Aug. 11, 2012, in London. (AP Photo/Gregory Bull)

Julie Bresset (4), of France, approaches the finish line to with the gold medal in the Mountain Bike Cycling women's race, at the 2012 Summer Olympics, Saturday, Aug. 11, 2012, at Hadleigh Farm, in Essex, England. Bresset dominated the picturesque course at Hadleigh Farm on Saturday to win the mountain bike gold medal in her first Olympics.(AP Photo/Christophe Ena)

Jaime Yusept Espinal of Puerto Rico reacts after beating Soslan Gattsiev of Belarus during the men's 84-kg freestyle wrestling competition at the 2012 Summer Olympics, Saturday, Aug. 11, 2012, in London. (AP Photo/Paul Sancya)

Russia's Evgeniya Kanaeva performs during the rhythmic gymnastics individual all-around final at the 2012 Summer Olympics, Saturday, Aug. 11, 2012, in London. (AP Photo/Gregory Bull)

Russia's Daria Dmitrieva bites her silver medal, as Gold medallist Russia's Evgeniya Kanaeva smiles during the podium ceremony for the rhythmic gymnastics individual all-around final at the 2012 Summer Olympics, Saturday, Aug. 11, 2012, in London. (AP Photo/Gregory Bull)

Bronze medallist Belarus' Liubou Charkashyna cries after a performance during the rhythmic gymnastics individual all-around final at the 2012 Summer Olympics, Saturday, Aug. 11, 2012, in London. (AP Photo/Gregory Bull)

The Netherlands Rogier Hofman plays a shot as Germany's Maximilian Mueller, left, tries to block in the men's field hockey gold medal match at the 2012 Summer Olympics, Saturday, Aug. 11, 2012, in London. (AP Photo/Eranga Jayawardena)

Gold medalist Elena Lashmanova of Russia, left, and teammate and silver medalist Olga Kaniskina, react after the women's 20-kilometer race walk competition at the 2012 Summer Olympics, Saturday, Aug. 11, 2012, in London. (AP Photo/Mike Groll)

Neringa Aidietyte of Lithuania competes in the 20-kilometer women's race walk at the 2012 Summer Olympics, Saturday, Aug. 11, 2012, in London. (AP Photo/Dmitry Lovetsky)

Athletes walk past Buckingham Palace as they compete in the men's 50-kilometer race walk, at the 2012 Summer Olympics, Saturday, Aug. 11, 2012, in London. (AP Photo/Lefteris Pitarakis)

Erick Barrondo, of Guatemala, refreshes himself during the men's 50-kilometer race walk at the 2012 Summer Olympics, Saturday, Aug. 11, 2012, in London. (AP Photo/Sergei Grits)

Cao Zhongrong of China, left, and Ondrej Polivka of the Czech Republic compete during the fencing section of the men's modern pentathlon at the 2012 Summer Olympics, Saturday, Aug. 11, 2012, in London. (AP Photo/Kirsty Wigglesworth)