Sergey Kirdyapkin of Russia leads on the final lap during the men's 50-kilometer race walk competition at the 2012 Summer Olympics, Saturday, Aug. 11, 2012, in London. (AP Photo/Ryan Pierse, Pool)
Sergey Kirdyapkin of Russia leads on the final lap during the men's 50-kilometer race walk competition at the 2012 Summer Olympics, Saturday, Aug. 11, 2012, in London. (AP Photo/Ryan Pierse, Pool)