Red Sox debut new uniform advertisements as part of 10-year deal with MassMutual, Sports
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Red Sox reveal first-ever uniform advertisements; MassMutual patches coming in 2023
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Boston Red Sox Announce MassMutual Patch on Jerseys Starting in 2023 – SportsLogos.Net News
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Red Sox to sport MassMutual logo under new partnership - Boston Business Journal
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MassMutual will be the first sponsor to have its logo on Red Sox uniforms - The Boston Globe
Red Sox reach $170 million jersey-patch deal, Mets also interested
Iconic Massachusetts Brands Unite: MassMutual Named Signature Partner and First Ever Jersey Patch Sponsor of the Boston Red Sox