MassMutual will be the first sponsor to have its logo on Red Sox

Red Sox Winter Weekend

Legendary MLB teams break marketing ground with insurance sponsors - Insurance News

Red Sox debut new uniform advertisements as part of 10-year deal with MassMutual, Sports

Boston Red Sox land a 10-year partnership with MassMutual

Iconic Massachusetts Brands Unite: MassMutual Named Signature Partner and First Ever Jersey Patch Sponsor of the Boston Red Sox

Red Sox Winter Weekend

Red Sox Sign Japanese Batting Champ Yoshida - Rafu Shimpo

Official Charity of the Boston Red Sox Red Sox Foundation - Red Sox Foundation

Colorful jerseys here to stay: Red Sox president says team not planning future uniform changes, Sports