MassMutual will be the first sponsor to have its logo on Red Sox uniforms - The Boston Globe
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Boston Red Sox Announce MassMutual Patch on Jerseys Starting in 2023 – SportsLogos.Net News
Red Sox to sport MassMutual logo under new partnership - Boston Business Journal
Red Sox to sport MassMutual logo under new partnership - Boston Business Journal
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Sox say so long to John Hancock. But hello maybe to MassMutual. - The Boston Globe
Red Sox debut new uniform advertisements as part of 10-year deal with MassMutual, Sports
Houston Astros reveal Oxy as first ever jersey partner - SportsPro