The Metropolitan Collegiate Summer Baseball League of Illinois has been in existence since 1978, with the commitment of promoting continued success and quality baseball in our communities.

Formally known as the Metro Thoroughbred League of Illinois, the league name was changed and Incorporated in 1987. The Metro League provides an opportunity for college players 19 through 22 years-old to improve and develop their baseball skills during their summer break. The League is formed from teams from the suburbs of Chicago.

College players, home for the summer, can enjoy their families and friends, together with participating in a good competitive league. Official NCAA rules are used with a few exceptions. The league has used wood bats since 1992. 

MCSBI, has a short action packed season. The league starts registration in the beginning of May with a starting date the first week in June. Play continues for 6-8 weeks with tournament play at the end of July.

College players are highly recommended by college coaches and scouts to baseball in the MCSBI. The league supplies seasoned and experienced coaches, providing the opportunity for the athlete to play with a suburb league, and to improve his potential of becoming a pro. Experienced college umpires handle games.