MassMutual will be the first sponsor to have its logo on Red Sox uniforms - The Boston Globe

A rough patch: the Astros' new sponsorship deal with Oxy is doubly ugly, Houston Astros

MassMutual will be advertising on the Red Sox jersey in 2023. - Over the Monster

MassMutual will be the first sponsor to have its logo on Red Sox uniforms - The Boston Globe

Red Sox to sport MassMutual logo under new partnership - Boston Business Journal

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

Fenway Sports Management

MassMutual, Red Sox announce multiyear partnership

jerseys – Blogging the Red Sox

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