Gold-medallist Sergey Kirdyapkin of Russia, center, stands with silver-medallist Jared Tallent of Australia, left, and bronze-medallist Si Tianfeng of China after the men's 50-kilometer race walk competition at the 2012 Summer Olympics, Saturday, Aug. 11, 2012, in London. (AP Photo/Mike Groll)
Gold-medallist Sergey Kirdyapkin of Russia, center, stands with silver-medallist Jared Tallent of Australia, left, and bronze-medallist Si Tianfeng of China after the men's 50-kilometer race walk competition at the 2012 Summer Olympics, Saturday, Aug. 11, 2012, in London. (AP Photo/Mike Groll)