Sergey Kirdyapkin of Russia won the Olympic gold medal Saturday in the 50-kilometer walk. Kirdyapkin broke the Olympic record by more than a minute with a time of 3 hours, 35 minutes, 59 seconds. He failed to finish this event at the Beijing Games. Jared Tallent of Australia took the silver medal for the second straight Olympics and the bronze medal went to Si Tianfeng of China.