United States' Benjamin Provisor, right, competes with Georgia's Zurabi Datunashvili during the 74-kg Greco-Roman wrestling competition at the 2012 Summer Olympics, Sunday, Aug. 5, 2012, in London.

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Goalkeeper Betsey Armstrong of the United States makes a save against Italy during their women's water polo quarterfinal match at the 2012 Summer Olympics, Sunday, Aug. 5, 2012, in London.

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United States' Sarah Robles reacts following a lift during women's +75-kg, weightlifting competition at the 2012 Summer Olympics, Sunday, Aug. 5, 2012, in London.

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United States' Holley Mangold competes during women's +75-kg, weightlifting competition at the 2012 Summer Olympics, Sunday, Aug. 5, 2012, in London.

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Lauren Wenger, right, of the United States defends against Teresa Frassinetti of Italy during their women's water polo quarterfinal match at the 2012 Summer Olympics, Sunday, Aug. 5, 2012, in London.

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USA's Swin Cash, center, is surrounded by China defenders, Ma Zengyu (11), Wei Wei, center back, and Chen Nan (15) during a preliminary women's basketball game at the 2012 Summer Olympics, Sunday, Aug. 5, 2012, in London.

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United States' Benjamin Provisor reacts after defeating Cuba's Alexei Bel, right, in the 74-kg Greco-Roman wrestling competition at the 2012 Summer Olympics, Sunday, Aug. 5, 2012, in London.

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Serena Williams, right, and Venus Williams of the United States celebrate their victory against Andrea Hlavackova and Lucie Hradecka of the Czech Republic in the gold medal women's doubles match at the All England Lawn Tennis Club in Wimbledon, London at the 2012 Summer Olympics, Sunday, Aug. 5, 2012.

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United States' Spenser Thomas Mango, left, competes with Egypt's Abouhalima Abouhalima during the 55-kg Greco-Roman wrestling competition at the 2012 Summer Olympics, Sunday, Aug. 5, 2012, in London.

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Serena Williams, left, and Venus Williams of the United States laugh together on the podium after receiving their gold medals in women's doubles at the All England Lawn Tennis Club in Wimbledon, London at the 2012 Summer Olympics, Sunday, Aug. 5, 2012.

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Richard Fellers, of the United States, rides his horse Flexible in the equestrian show jumping team competition at the 2012 Summer Olympics, Sunday, Aug. 5, 2012, in London.

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Bobby Lea of The United States competes in the track cycling men's omnium individual pursuit, during the 2012 Summer Olympics in London, Sunday, Aug. 5, 2012.

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United States' Abby Wambach listens to a reporter's question during a women's soccer news conference for the 2012 Summer Olympics, Sunday, Aug. 5, 2012, at Old Trafford in Manchester, England.

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Misty May Treanor of the United States returns a ball during a beach volleyball match against Italy at the 2012 Summer Olympics, Sunday, Aug. 5, 2012, in London.

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Quanitta Underwood of the United States, left, and Natasha Jonas of Great Britain, fight during the women's lightweight boxing competition at the 2012 Summer Olympics, Sunday, Aug. 5, 2012, in London.

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China's Zhao Shuang (7) watches United States' Angel McCoughtry (8) shoot during their women's preliminary round basketball game at the 2012 Summer Olympics on Sunday, Aug. 5, 2012, in London.

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Peter Joppich of Germany competes against Gerek Meinhardt of the United States, right, during the men's foil team fencing competition at the 2012 Summer Olympics, Sunday, Aug. 5, 2012, in London.

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Britain's Andy Murray celebrates after defeating Switzerland's Roger Federer to win the men's singles gold medal match at the All England Lawn Tennis Club at Wimbledon, in London, at the 2012 Summer Olympics, Sunday, Aug. 5, 2012.

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United States' Lashinda Demus competes in a women's 400-meter hurdles heat during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Sunday, Aug. 5, 2012. (AP Photo/Anja Niedringhaus)

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In this photo made using a fisheye lens, Jaime Azcarraga, of Mexico, rides his horse Gangster, in the equestrian show jumping team competition at the 2012 Summer Olympics, Sunday, Aug. 5, 2012, in London.

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Race Imboden of the United States, left, competes against Enzo Lefort of France during the men's foil team fencing competition at the 2012 Summer Olympics, Sunday, Aug. 5, 2012, in London.

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Alexander Massialas of the United States reacts while competing against Sebastian Bachman of Germany in the bronze medal match during the men's foil team fencing competition at the 2012 Summer Olympics, Sunday, Aug. 5, 2012, in London.

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United States' Lashinda Demus right, jumps in a women's 400-meter hurdles heat during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Sunday, Aug. 5, 2012.

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Venus Williams, right, and Serena Williams of the United States celebrate their victory against Andrea Hlavackova and Lucie Hradecka of the Czech Republic during the gold medal women's doubles match at the All England Lawn Tennis Club in Wimbledon, London at the 2012 Summer Olympics, Sunday, Aug. 5, 2012.

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Andy Murray of Great Britain celebrates after defeating Roger Federer of Switzerland in the men's singles gold medal match at the All England Lawn Tennis Club at Wimbledon, in London, at the 2012 Summer Olympics, Sunday, Aug. 5, 2012.

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U.S. gymnast McKayla Maroney, right, stand along with Romania's gymnast Sandra Raluca Izbasa during the podium ceremony for the artistic gymnastics women's vault finals at the 2012 Summer Olympics, Sunday, Aug. 5, 2012, in London.

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Venus Williams, left, and Serena Williams of the United States celebrate their victory against Andrea Hlavackova and Lucie Hradecka of the Czech Republic in the gold medal women's doubles match at the All England Lawn Tennis Club in Wimbledon, London at the 2012 Summer Olympics, Sunday, Aug. 5, 2012.

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Kelly Rulon of the United States, right looks to pass the ball forward as Roberta Bianconi of Italy moves to block during their women's water polo quarterfinal match at the 2012 Summer Olympics, Sunday, Aug. 5, 2012, in London.

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Misty May Treanor of the United States returns a ball during a beach volleyball match against Italy at the 2012 Summer Olympics, Sunday, Aug. 5, 2012, in London.

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Kerri Walsh of the United States sets the ball during a beach volleyball match against Italy at the 2012 Summer Olympics, Sunday, Aug. 5, 2012, in London.

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Men's 10,000-meter winners, from left, United States' silver medalist Galen Rupp, Britain's gold medalist Mo Farah, and Ethiopia's bronze medalist Tariku Bekele pose for photographers during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Sunday, Aug. 5, 2012.

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