MassMutual is first jersey patch sponsor of the Red Sox
MLB's Detroit Tigers expand Meijer sponsorship with jersey patch deal
Red Sox reportedly sign jersey patch deal with MassMutual
Red Sox debut new uniform advertisements as part of 10-year deal with MassMutual, Sports
St. Louis Cardinals land Stifel as first jersey patch sponsor
Larger-Than-Life Drone Show Celebrates MassMutual's Sponsorship of the Boston Red Sox
The Boston Red Sox announced a major off-the-field partnership with MassMutual – Boston 25 News
MLB's announced jersey patch deals so far-San Diego Padres: Motorola. Boston Red Sox: MassMutual. Los Angeles Angels: Foundation Building Materials. Arizona Diamondbacks: Avnet : r/baseball
John Hancock ending long-held Boston Red Sox sponsorship
Cleveland Guardians to wear Marathon jersey patch
Sox say so long to John Hancock. But hello maybe to MassMutual. - The Boston Globe