By A Mystery Man Writer
Ten-year partnership sees the insurer become the MLB team's first jersey patch partner.
Boston Red Sox confirm MassMutual as signature sponsor - SportsPro
Iconic Massachusetts Brands Unite: MassMutual Named Signature Partner and First Ever Jersey Patch Sponsor of the Boston Red Sox
MLB's new uniform rules won't prevent Red Sox from keeping Boston
MassMutual will be the first sponsor to have its logo on Red Sox
MLB's new uniform rules won't prevent Red Sox from keeping Boston
All red sox uniforms, Red Sox debut new uniform advertisements as part of 10-year deal with MassMutual, Sports
Red Sox debut new uniform advertisements as part of 10-year deal with MassMutual, Sports
Red Sox will have MassMutual logo on their jerseys beginning in
Balls and Strikes on the MassMutual sign - marketing masterclass! : r/redsox
MassMutual will be the first sponsor to have its logo on Red Sox uniforms - The Boston Globe
Red Sox debut new uniform advertisements as part of 10-year deal with MassMutual, Sports