Mexico's Briseida Acosta (Back), combats against Olga Ivanova (Front) of Russia during the 73 kg women's category of the Taekwondo World Championship of the World Taekwondo Federation (WTF), at the Expositions and Coventions Center of Puebla, in Puebla, Mexico, on July 18, 2013. (Xinhua/Guillermo Arias)