FILE - In this July 31, 2012 file photo, United States' Michael Phelps poses with his gold medal for the men's 4x200-meter freestyle relay swimming final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London. (AP Photo/Matt Slocum, File)

FILE - In this Aug. 5, 2012, file photo, South Africa's Oscar Pistorius runs in one of the men's 400-meter semifinal races during the athletics competition in the Olympic Stadium at the 2012 Summer Olympics, London. (AP Photo/Lee Jin-man, File)

FILE - In this Aug. 5, 2012, file photo, Jamaica's Usain Bolt crosses the finish line to win gold in the men's 100-meter final in the Olympic Stadium at the 2012 Summer Olympics in London. (AP Photo/David J. Phillip, File)

FILE - In this July 28, 2012, file photo, Britain's Queen Elizabeth II, right, declares the games open alongside International Olympic Committee Vice President Thomas Bach during the Opening Ceremony at the 2012 Summer Olympics in London. (AP Photo/Cameron Spencer, Pool, File)

FILE - In this Aug. 3, 2012, file photo, United States' Missy Franklin starts in the women's 200-meter backstroke final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London. Franklin won a gold medal in the event. (AP Photo/Michael Sohn, File)

FILE - In this July 27, 2012, file photo, a person dressed as Queen Elizabeth II parachutes into the Olympic stadium during the Opening Ceremony of the 2012 Olympic Summer Games at the Olympic Stadium in London. (AP Photo/Ezra Shaw/Pool Photo via AP)