Looking for an MSBL league in your area? Click HERE and we'll show you the way! Founded in , it is the fastest-growing adult baseball organization in the country. The league has local affiliates, 3, teams and 45, members who play organized amateur baseball in local leagues, 30 regional tournaments and six national tournaments. Both the MSBL and the MABL plan to expand by establishing local affiliates in communities where programs do not exist, and also by welcoming existing amateur hardball leagues to affiliate.