MassMutual will be the first sponsor to have its logo on Red Sox uniforms - The Boston Globe

jerseys – Blogging the Red Sox

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MassMutual is first jersey patch sponsor of the Red Sox

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MassMutual will be the first sponsor to have its logo on Red Sox

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MLB Teams with Jersey Patch Sponsors for the 2023 Season - Zoomph

Red Sox, MassMutual near a $17M jersey patch deal - Boston

Boston Red Sox confirm MassMutual as signature sponsor - SportsPro

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