Race walking at the Olympics the first two editions, the women's event was extended to match the men's 20 km distance from the 2000 Sydney Olympics onwards. Women have never commonly competed internationally over 50 km, thus it has never been proposed as an Olympic event – as of 2012 it remains the only event on the Olympic athletics programme in which men compete, but women do not have an equivalent. The 50 km is also the longest distance race for an Olympic athletics event. The Olympic records in racewalking were all broken at the 2012 London Olympics. In the 20 km walk Chen Ding
2011 World Championships in Athletics – Men's 20 kilometres walk 2011 World Championships in Athletics – Men's 20 kilometres walk ] The Men's 20 kilometres walk event at the 2011 World Championships in Athletics was held on August 28 on a loop course starting and finishing at Gukchae - bosang Memorial Park in the center of Daegu. Forty-six men started the competition and 27 countries were represented. Valeriy Borchin entered as the reigning world and 2008 Olympic champion. The athletes on the Chinese and Russian teams led the rankings that year: Wang Zhen and Chu Yafei were the top two, while Borchin, world record holder Vladimir Kanaykin, and Sergey Morozov