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Misty May-Treanor of the US hits the ball during a women's beach volleyball semifinal match against China. May-Treanor and her partner, Kerri Walsh Jennings, advanced to the finals.

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Spain’s Marta Mangue Gonzalez, left, embraces teammate Begona Fernandez Molinos after defeating Croatia in their women's handball quarterfinal match.

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Aly Raisman of Needham hugs coach Mihai Brestyan after winning the gold medal for the artistic gymnastic final.

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Aly Raisman of Needham performs during the women's beam competition of the artistic gymnastics event.

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Aly Raisman of Needham competes on the beam during the the artistic gymnastics final.

Mike Blake/REUTERS

Russia's Kseniia Afanaseva competes in the women's gymnastics balance beam final.

Mike Blake/REUTERS

China's Deng Linlin competes in the women's gymnastics balance beam final.

Brian Snyder/REUTERS

France's Hamilton Sabot competes in the men's gymnastics parallel bars final.

Mark Blinch/REUTERS

Russia's Yelena Isinbayeva fails to clear the bar in the women's pole vault final.

Mike Blake/REUTERS

Gabrielle Douglas of the United States falls as she competes in the women's gymnastics balance beam final.

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Germany's gymnast Marcel Nguyen performs to win silver in the men's parallel bars competition.

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Matthieu Rossett of France competes in the men’s 3-meter springboard diving semifinal.

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Robert Grabarz of Great Britain competes in the men's high jump final.

FABRICE COFFRINI/AFP/Getty Images

Athletes dive at the start of the men's triathlon event.

Tim Wimborne/REUTERS

Belgium's Simon De Cuyper competes in the men's triathlon final.

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Felipe Van De Wyngard of Chile and Brendan Sexton of Australia compete in the swim portion of the men’s triathlon.

Mike Segar/REUTERS

Canada’s Krista Phillips, right, reaches for the rebound with Tamika Catchings, center, and Tina Charles, both of the United States in the women’s quarterfinal basketball match.

Eric Gay/AP

Canada’s Kim Smith, left, and American Tamika Catchings chase a loose ball during a quarterfinal women’s basketball game.

Marcio Jose Sanchez/AP

Mexico’s Diego Reyes (13) goes up for a header against Senegal’s Moussa Konate during their quarterfinal men’s soccer match.

Julio Cortez/AP

Giulia Rambaldi, left, of Italy tugs on the bathing suit of He Jin of China during their women’s semifinal fifth to eighth place water polo match.

Damir Sagolj/REUTERS

Tunisia’s Hassine Ayari, left, battles with Morocco’s Choukri Atafi on the men’s 96Kg Greco-Roman wrestling.

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Hungary’s Tamas Lorincz, rear, wrestles Georgia’s Manucher Tskhadaia during their 96 kg Greco-Roman wrestling semifinal match.

Damir Sagolj/REUTERS

Iran’s Saeid Morad Abdvali, in blue, tussles with France’s Steeve Guenot on the men’s 66Kg Greco-Roman wrestling.

INDRANIL MUKHERJEE/AFP/Getty Images

Timothy Drummond of South Africa dives to pass a ball during the field hockey preliminary round match against Argentina.

Ivan Alvarado/REUTERS

China’s Ma Yunwen, left, and Hui Ruoqi react after losing their women’s quarterfinal volleyball match against Japan.

Anja Niedringhaus/AP

China’s Liu Xiang sits after falling in a men's 110-meter hurdles heat.

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Jason Richardson of the United States competes in the men’s 110-meter hurdles heats.

Morry Gash/AP

Shamar Sands of the Bahamas falls after hitting a hurdle in the men’s 100-meter hurdles.

Kai Pfaffenbach/REUTERS

Jamaica’s Usain Bolt, center, runs to a first-place finish in his men’s 200-meter round 1 heat.

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Britain’s Nick Dempsey poses with his sons Thomas-Flynn, left, and Oscar after he won silver in the men’s RS:X sailing class.

Bernat Armangue/AP

Spain’s Marina Alabau celebrates after winning the RS:X women’s gold medal.

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Bronze medalist Aly Raisman of Needham poses on the podium during the medal ceremony for the artistic gymnastics women’s beam final.

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Gold medalist Aly Raisman of Needham on the podium for the women’s floor exercise artistic gymnastics event.