Zack Greike wore this jersey on April 15, 2009, Jackie Robinson Day. Greinke personally had the entire Royals team sign the jersey to benefit the Kansas City chapter of RBI - Reviving Baseball in the Inner City.
Together with Royals Charities, Zack sponsored four (4) teams in the local RBI program.
Players included on the autograph include: Greinke, CoCo Crisp, Billy Butler, Mark Teahen, Gil Meche and others.
The jersey is authenticated as game worn.
The proceeds of the sale of this jersey will benefit the Reviving Baseball in the Inner City program of Greater Kansas City.