In 2012 the foremost competition in athletics was the 2012 Summer Olympics in London. The International Association of Athletics Federations held four other global level competitions in 2012: the 2012 IAAF World Indoor Championships, 2012 IAAF World Race Walking Cup, 2012 World Junior Championships in Athletics and the 2012 IAAF World Half Marathon Championships. The Diamond League entered its third year as the foremost seasonal track and field series.