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.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.

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

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

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.

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

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

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

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

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

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

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

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

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

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.

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

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

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