Gold-medallist Russia's Sergey Kirdyarkin, center, silver-medallist Australia's Jared Tallent, left, and bronze-medallist China's Tianfeng Si, right, pose for photos with their medals following the men's 50-kilometer race walk, at the 2012 Summer Olympics, Saturday, Aug. 11, 2012, in London. (AP Photo/Lefteris Pitarakis)
Gold-medallist Russia's Sergey Kirdyarkin, center, silver-medallist Australia's Jared Tallent, left, and bronze-medallist China's Tianfeng Si, right, pose for photos with their medals following the men's 50-kilometer race walk, at the 2012 Summer Olympics, Saturday, Aug. 11, 2012, in London. (AP Photo/Lefteris Pitarakis)