This autographed Louisville Slugger Powerized baseball at has been personally hand-signed by Christian Yelich of the Milwaukee Brewers.The autograph is certified by James Spence Authentication's (JSA) Witnessed Protection Program. That means that a JSA representative was present when this item was signed. It comes with the numbered hologram and matching Certificate of Authenticity. It is also certified by USA Sports Marketing. It comes with the numbered hologram and matching Certificate of Authenticity.