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

Official Charity of the Boston Red Sox

Take us out to the ballgame - BOStoday

The Boston Red Sox announced a major off-the-field partnership

MassMutual becomes 'signature sponsor' for Boston Red Sox

Red Sox accidentally picked Yankees fan to sponsor jerseys for

MLB Jerseys' to Feature Corporate Sponsor Logos for First Time

Red Sox to sport MassMutual logo under new partnership - Boston

Cleveland Guardians Announce Jersey Sponsorship - Sports

MLB's announced jersey patch deals so far-San Diego Padres

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