MassMutual will be the first sponsor to have its logo on Red Sox uniforms - The Boston Globe
MLB Team Sponsorship Revenue Grew To $1.5 Billion In 2023, Report Shows
MassMutual will be advertising on the Red Sox jersey in 2023. - Over the Monster
Larger-Than-Life Drone Show Celebrates MassMutual's Sponsorship of the Boston Red Sox
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Boston Red Sox Announce MassMutual Patch on Jerseys Starting in 2023 – SportsLogos.Net News