Usain Bolt of Jamaica looks to the crowd after winning the 100m men's final. (AP Photo/Itsuo Inouye)
Juan Carlos Payano of Dominican Republic, left, fights Vincenzo Picardi of Italy during a men's flyweight 51 kilogram preliminary boxing match. (AP Photo/Murad Sezer)
Ukraine's Nataliia Dobrynska, centrr, celebrates winning the gold medal in the women's heptathlon. (AP Photo/Thomas Kienzle)
USA's Kobe Bryant goes up for a dunk against Spain during a men's preliminary basketball game. (AP Photo/Eric Gay, Pool)
Australia's Kylie Wheeler, center, is surrounded by other athletes after the final 800-meter run of the women's heptathlon. (AP Photo/Thomas Kienzle)
Argentina's forward Sergio Aguero, top, goes over the Netherlands defender Dirk Marcellis, bottom, as they battle for the ball during a Beijing 2008 Summer Olympics men's quarterfinal soccer match. Argentina won 2-1. (AP Photo/Eugene Hoshiko)
Usain Bolt of Jamaica's left shoe appears to be untied just after he crossed the finish line to win the men's 100m final. (AP Photo/Anja Niedringhaus)
Switzerland's Roger Federer, top, and Stanislas Wawrinka celebrate winning the men's doubles gold medal. (AP Photo/Elise Amendola)
New Zealand's Valerie Vili, right, is congratulated by Germany's Nadine Kleinert after winning the gold in the women's shot put. (AP Photo/David J. Phillip)
