'Mystery baseballs' fundraiser returns Friday

SAN FRANCISCO -- "Mystery baseballs," a popular item during Spring Training, will return Friday as the Giants Community Fund and the Giants Wives combine to stage a fundraiser for people affected by the Boston Marathon bombing and the fertilizer-plant fire and explosion in West Texas.

Approximately 300 baseballs, each autographed by one player or coach on the current roster or a Giants alumnus, will be on sale at the Giants Community Clubhouse for $80 apiece. The clubhouse is located on the ballpark's Promenade Level behind home plate.

An online auction also will be held at www.jrgiants.org (click on "AUCTION" to participate).

Proceeds will be shared between One Fund Boston and POINTWEST Bank Fund.

Chris Haft is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.