MassMutual will be the first sponsor to have its logo on Red Sox
Iconic Massachusetts Brands Unite: MassMutual Named Signature Partner and First Ever Jersey Patch Sponsor of the Boston Red Sox
Red Sox Foundation
Boston Red Sox bag US$170m MassMutual jersey patch deal, says report - SportsPro
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Boston Red Sox Announce MassMutual Patch on Jerseys Starting in 2023 – SportsLogos.Net News
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Why MassMutual invested in a jersey sponsorship with the Red Sox