US swimmer Michael Phelps concentrates b

US swimmer Michael Phelps concentrates before the men's 200m individual medley semi-finals swimming event at the London 2012 Olympic Games on August 1, 2012 in London. AFP PHOTO / GABRIEL BOUYS (Photo credit should read GABRIEL BOUYS/AFP/GettyImages)

US swimmer Tyler Clary celebrates after

US swimmer Tyler Clary celebrates after the men's 200m backstroke semi-finals swimming event at the London 2012 Olympic Games on August 1, 2012 in London. AFP PHOTO / GABRIEL BOUYS (Photo credit should read GABRIEL BOUYS/AFP/GettyImages)

US national basketball team forward LeBr

US national basketball team forward LeBron James is seen in the stands during the women's preliminary round group A basketball match of the London 2012 Olympic Games USA vs Turkey on August 1, 2012 at the basketball arena in London, shows a tattoo on the shoulder of Turkey's Esmeral Tuncluer. AFP PHOTO / TIMOTHY A. CLARY (Photo credit should read TIMOTHY A. CLARY/AFP/GettyImages)

US centre Tina Charles competes during t

US centre Tina Charles competes during the women's preliminary round group A basketball match of the London 2012 Olympic Games USA vs Turkey on August 1, 2012 at the basketball arena in London, shows a tattoo on the shoulder of Turkey's Esmeral Tuncluer. AFP PHOTO / TIMOTHY A. CLARY (Photo credit should read TIMOTHY A. CLARY/AFP/GettyImages)

US swimmer Rebecca Soni concentrates bef

US swimmer Rebecca Soni concentrates before the women's 200m breaststroke semi-finals swimming event at the London 2012 Olympic Games on August 1, 2012 in London. AFP PHOTO / GABRIEL BOUYS (Photo credit should read GABRIEL BOUYS/AFP/GettyImages)

US swimmer Rebecca Soni celebrates after

US swimmer Rebecca Soni celebrates after breaking the world record in the women's 200m breaststroke semi-finals swimming event at the London 2012 Olympic Games on August 1, 2012 in London. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/GettyImages)

Olympics Day 5 - Volleyball

LONDON, ENGLAND - AUGUST 01: Destinee Hooker #19 of United States celebrates a point in the third set against China during Women's Volleyball on Day 5 of the London 2012 Olympic Games at Earls Court on August 1, 2012 in London, England. (Photo by Elsa/Getty Images)

US swimmer Tyler Clary competes in the m

US swimmer Tyler Clary competes in the men's 200m backstroke semi-finals swimming event at the London 2012 Olympic Games on August 1, 2012 in London. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/GettyImages)

US Shannon Vreeland and Dana Vollmer (R)

US Shannon Vreeland and Dana Vollmer (R) support their teammates during the women's 4x200m freestyle relay final swimming event at the London 2012 Olympic Games on August 1, 2012 in London. AFP PHOTO / GABRIEL BOUYS (Photo credit should read GABRIEL BOUYS/AFP/GettyImages)

US swimmer Ryan Lochte competes in the m

US swimmer Ryan Lochte competes in the men's 200m individual medley semi-finals swimming event at the London 2012 Olympic Games on August 1, 2012 in London. AFP PHOTO / GABRIEL BOUYS (Photo credit should read GABRIEL BOUYS/AFP/GettyImages)

Olympics Day 5 - Swimming

LONDON, ENGLAND - AUGUST 01: Ryan Lochte (R) and Michael Phelps of the United States look on after they competed in the first semifinal heat of the Men's 200m Individual Medleyon Day 5 of the London 2012 Olympic Games at the Aquatics Centre on August 1, 2012 in London, England. (Photo by Alexander Hassenstein/Getty Images)

US swimmer Nathan Adrian celebrates afte

US swimmer Nathan Adrian celebrates after winning the men's 100m freestyle final swimming event at the London 2012 Olympic Games on August 1, 2012 in London. AFP PHOTO / GABRIEL BOUYS (Photo credit should read GABRIEL BOUYS/AFP/GettyImages)

Olympics Day 5 - Archery

LONDON, ENGLAND - AUGUST 01: (EDITORS NOTE: A MIRROR LENS WAS USED TO CREATE THIS IMAGE) Jake Kaminski of United States competes in his Men's Individual Archery 1/32 Eliminations match against Dan Olaru of Moldova during the Men's Individual Archery on Day 5 of the London 2012 Olympic Games at Lord's Cricket Ground on August 1, 2012 in London, England. (Photo by Paul Gilham/Getty Images)

US gymnast Danell Leyva reacts after per

US gymnast Danell Leyva reacts after performing on the floor during the men's individual all-around competition of the artistic gymnastics event of the London Olympic Games on August 1, 2012 at the 02 North Greenwich Arena in London. Japan's superstar Kohei Uchimura won gold while Germany's Marcel Nguyen took silver and Danell Leyva of the US got bronze. AFP PHOTO / EMMANUEL DUNAND (Photo credit should read EMMANUEL DUNAND/AFP/GettyImages)

US fencer Dagmara Wozniak celebrates her

US fencer Dagmara Wozniak celebrates her victory over Tunisia's Azza Besbes during their Women's sabre bout as part of the fencing event of London 2012 Olympic games, on August 1, 2012 at the ExCel centre in London. AFP PHOTO / ALBERTO PIZZOLI (Photo credit should read ALBERTO PIZZOLI/AFP/GettyImages)

Olympics Day 5 - Cycling - Road

LONDON, ENGLAND - AUGUST 01: Kristin Armstrong of the United States waits for the results during the Women's Individual Time Trial Road Cycling on day 5 of the London 2012 Olympic Games on August 1, 2012 in London, England. (Photo by Alex Livesey/Getty Images)

Jacob Gibb and Sean Rosenthal of the US

Jacob Gibb and Sean Rosenthal of the US celebrate during the men's Beach Volleyball preliminary phase Pool D match against Latvia?s Aleksandrs Samoilovs and Ruslans Sorokins on The Centre Court Stadium in Horse Guards Parade on London on August 1, 2012, for the London 2012 Olympic Games. The US won 2-0 AFP PHOTO / DANIEL GARCIA (Photo credit should read DANIEL GARCIA/AFP/GettyImages)

Olympics Day 5 - Tennis

LONDON, ENGLAND - AUGUST 01: Serena Williams of the United States celebrates after defeating Vera Zvonareva of Russia in the third round of Women's Singles Tennis on Day 5 of the London 2012 Olympic Games at Wimbledon on August 1, 2012 in London, England. (Photo by Clive Brunskill/Getty Images)

US swimmer Michael Phelps prepares for t

US swimmer Michael Phelps prepares for the men's 200m individual medley heats swimming event at the London 2012 Olympic Games on August 1, 2012 in London. AFP PHOTO / MARTIN BUREAU (Photo credit should read MARTIN BUREAU/AFP/GettyImages)

Olympics Day 4 - Basketball

LONDON, ENGLAND - JULY 31: Lebron James #6 of United States looks on in the Men's Basketball Preliminary Round match between the United States and Tunisia on Day 4 of the London 2012 Olympic Games at Basketball Arena on July 31, 2012 in London, England. (Photo by Ezra Shaw/Getty Images)

Olympics Day 4 - Swimming

LONDON, ENGLAND - JULY 31: Allison Schmitt of the United States celebrates after winning gold in the Women's 200m Freestyle final on Day 4 of the London 2012 Olympic Games at the Aquatics Centre on July 31, 2012 in London, England. (Photo by Clive Rose/Getty Images)

US' Todd Rogers celebrates at the end of

US' Todd Rogers celebrates at the end of the men's Beach Volleyball preliminary phase Pool B match against Spain's Pablo Herrera and Adrian Gavira on The Centre Court Stadium in Horse Guards Parade in London on July 31, 2012 at the London 2012 Olympic Games. USA won 2-1 AFP PHOTO / DANIEL GARCIA (Photo credit should read DANIEL GARCIA/AFP/GettyImages)

Olympics Day 4 - Swimming

LONDON, ENGLAND - JULY 31: Gold Medallist Michaell Phelps of the United States smiles prior to receiving his medal on the podium during the medal ceremony for the Men's 4 x 200m Freestyle Relay final on Day 4 of the London 2012 Olympic Games at the Aquatics Centre on July 31, 2012 in London, England. (Photo by Clive Rose/Getty Images)

US swimmer Michael Phelps stands on the

US swimmer Michael Phelps stands on the podium after winning a silver medal in the men's 200m butterfly final during the swimming event at the London 2012 Olympic Games on July 31, 2012 in London. AFP PHOTO / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP/GettyImages)

US swimmer Clark Burckle competes in the

US swimmer Clark Burckle competes in the men's 200m breaststroke semi-finals during the swimming event at the London 2012 Olympic Games on July 31, 2012 in London. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/GettyImages)

United States' Travis Stevens reacts aft

United States' Travis Stevens reacts after losing his men's -81kg judo contest bronze medal match of the London 2012 Olympic Games on July 31, 2012 at the ExCel arena in London. AFP PHOTO / JOHANNES EISELE (Photo credit should read JOHANNES EISELE/AFP/GettyImages)

Olympics Day 4 - Swimming

LONDON, ENGLAND - JULY 31: Cullen Jones of the United States looks on after competing in the Men's 100m Freestyle heat 8 on Day 4 of the London 2012 Olympic Games at the Aquatics Centre on July 31, 2012 in London, England. (Photo by Adam Pretty/Getty Images)

US Misty May-Treanor (C) celebrate after

US Misty May-Treanor (C) celebrate after winning with Kerri Walsh their women's beach volleyball preliminary phase Pool C match against Czech Republic's Marketa Slukova and Kristyna Kolocova on The Centre Court Stadium at Horse Guards Parade in London on July 30, 2012, during the London 2012 Olympic Games. AFP PHOTO / DANIEL GARCIA (Photo credit should read DANIEL GARCIA/AFP/GettyImages)

US gymnast Danell Leyva competes at the

US gymnast Danell Leyva competes at the parallel bars during the men's team final of the artistic gymnastics event of the London Olympic Games on July 30, 2012 at the 02 North Greenwich Arena in London. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/GettyImages)

Olympics Day 3 - Swimming

LONDON, ENGLAND - JULY 30: Breeja Larson of the United States reacts after she competed in the Final of the Women's 100m Breaststroke on Day 3 of the London 2012 Olympic Games at the Aquatics Centre on July 30, 2012 in London, England. (Photo by Al Bello/Getty Images)