Men's Softball World Championship  The Men's Softball World Championship, known through 2015 as the ISF Men's World Championship, is a softball tournament for the best national men's teams in the world. From 1966 to 2013 it was held every four years, first by the International Softball Federation (ISF) and from 2015 an onward it is held every two years by the World Baseball Softball Confederation (WBSC), the 16 best teams in the world compete. In 1976 the final day was rained out. New Zealand, USA and Canada were all awarded the gold medal.