Mercer Island Select Baseball (MISB) is a community-based baseball program that prioritizes keeping players together throughout their youth baseball experience. We do this with the hopes of building close-knit and competitive older programs that will eventually feed into MIHS to thrive.

Boost Baseball is a hugely beneficial partner and supporter of MI baseball programs. This partnership allows MISB teams to have access to elite training opportunities in the offseason. Because of this partnership, all Mercer Island residents are prohibited to join or play for 8U, 9U, 10U, 11U, and 12U Boost Baseball teams (such as Boost Braves or New Level Boost). Mercer Island residents also cannot train with Boost Baseball with any programs that are external from Mercer Island programs.

This policy is in place to prevent partner competition, maintain a positive relationship with Boost Baseball, and to continue foster our community-based baseball values. This is a mutual and non-negotiable agreement between MISB and Boost Baseball.