Alex Livesey/Getty ImagesTennis star Maria Sharapova, who missed the 2008 Olympics because of injury, led the Russian contingent into the stadium during Friday's opening ceremony for the London Games. 
AP Photo/Mark HumphreyDana Abdul Razak, a sprinter who will compete in the 100 meters, carried the flag for Iraq. 
AP Photo/Mark HumphreyMexico's Maria del Rosario Espinoza won gold in taekwondo at the 2008 Beijing Olympics.
AP Photo/Mark HumphreyJapan flag bearer Saori Yoshida will try for a third straight gold in women's freestyle wrestling. 
Alex Livesey/Getty ImagesGerman field hockey star Natascha Keller is competing in her fifth Summer Olympics. 
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