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

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

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Boston Red Sox confirm MassMutual as signature sponsor - SportsPro

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Red Sox to sport MassMutual logo under new partnership - Boston Business Journal

Boston Red Sox confirm MassMutual as signature sponsor - SportsPro