Japan's wrestler Saori Yoshida smiles during a training session ahead of the 2012 London Olympics at the National Training Center in Tokyo March 20, 2012. Don't let the fluffy socks fool you. Pint-sized Japanese wrestler Saori Yoshida could just be the most fearsome athlete in any sport at this year's London Olympics. Yoshida, who marched Terminator-like to Olympic wrestling gold in the 2004 and 2008 women's 55-kg division, has never tasted defeat at an Olympics, world or Asian championships. Picture taken March 20, 2012. To match OLY-WRES-YOSHIDA-PROFILE/ REUTERS/Toru Hanai (JAPAN - Tags: SPORT OLYMPICS WRESTLING)