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Mariel Zagunis (L) of the USA competes against Angelica Larios of Mexico in a team's sabre gold medal match, during the Guadalajara 2011 Pan American Games, in Guadalajara, Mexico, on October 28, 2011. AFP PHOTO/OMAR TORRES (Photo credit should read OMAR TORRES/AFP/Getty Images)

U.S. flag-bearer Mariel Zagunis

Two-time fencing gold medalist Mariel Zagunis has been chosen as the flag-bearer for the United States in Friday's Opening Ceremony.