Gold medallist Ashton Eaton of the United States, left, and silver medallist Trey Hardee of the United States celebrate following the decathlon 1500-meter during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Thursday, Aug. 9, 2012. (AP Photo/Matt Dunham)
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 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)
**FILE** South Africa's Oscar Pistorius participates Aug. 5, 2012 in the men's 400-meter semifinal at Olympic Stadium during the 2012 Summer Olympics in London. (Associated Press)
**FILE** South Africa's Oscar Pistorius participates Aug. 5, 2012 in the men's 400-meter semifinal at Olympic Stadium during the 2012 Summer Olympics in London. (Associated Press)
United States' Ashton Eaton performs in the discus throw Aug. 9, 2012, during the decathlon event in Olympic Stadium at the 2012 Summer Olympics in London. (Associated Press)
United States' Ashton Eaton performs in the discus throw Aug. 9, 2012, during the decathlon event in Olympic Stadium at the 2012 Summer Olympics in London. (Associated Press)
United States' Allyson Felix celebrates her win in the women's 200-meter final during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Wednesday, Aug. 8, 2012. (AP Photo/Martin Meissner)
United States' Allyson Felix celebrates her win in the women's 200-meter final during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Wednesday, Aug. 8, 2012. (AP Photo/Martin Meissner)
