The Men’s Senior Baseball League (MSBL), also known as amateur men's big league baseball, is an American premier amateur baseball league where past and present MLB players are also known to play. Playoff tournament games are are held at MLB spring training ballparks. The MSBL is staffed at the national level by a professional team of seasoned baseball veterans and throughout the nation by top notch local league leadership. Founded in 1988, it is the largest amateur baseball league in America. The league has 325 local affiliates, 3,200 teams and 45,000 members who play organized amateur baseball in local leagues, 30 regional tournaments and six national tournaments. There are multiple age brackets ranging from 18+, 25+, 35+, 45+ and 50+ leagues. The MSBL has an estimated 45,,000 players nationwide including over 120 former MLB players, some featured below.