Our RLB (Rock League Baseball) adult program is one of the largest adult baseball leagues in the United States, representing over 60 teams and over 900 players in the greater Milwaukee area. RLB was formed in 2013 through a merger of Milwaukee MSBL and the Milwaukee Baseball League. We are a proud member of national MSBL, which represents a brotherhood of over 45,000 adult hardball players across the United States, playing in tournaments all over the US, including the largest baseball tournament in the world – the MSBL World Series. Our age divisions are 18+, 25+. 35+, 45, 55+, 62+ and our newly formed 70+. League play starts Mid-April and goes through September.