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QINHUANGDAO, CHINA - MAY 13: Marlen Esparza (Blue) of the United States attends the Women's 51kg preliminary match during the AIBA Women's World Boxing Championships on May 13, 2012 in Qinhuangdao, China. The AIBA Women's World Boxing Championships 2012 which is a London Olympic Games Qualifying Event will be held from May 11 to 19. (Photo by Feng Li/Getty Images)
QINHUANGDAO, CHINA - MAY 13: Marlen Esparza (Blue) of the United States attends the Women's 51kg preliminary match during the AIBA Women's World Boxing Championships on May 13, 2012 in Qinhuangdao, China. The AIBA Women's World Boxing Championships 2012 which is a London Olympic Games Qualifying Event will be held from May 11 to 19. (Photo by Feng Li/Getty Images)

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Marlen Esparza helps shatter a glass ceiling as one of the first women to box at the Olympics.

Lady boxer breaks Olympic glass ceiling

Marlen Esparza helps shatter a glass ceiling as one of the first women to box at the Olympics.