MassMutual is first jersey patch sponsor of the Red Sox
Red Sox reportedly sign jersey patch deal with MassMutual
MassMutual will be the first sponsor to have its logo on Red Sox uniforms - The Boston Globe
Red Sox to sport MassMutual logo under new partnership - Boston Business Journal
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Red Sox debut new uniform advertisements as part of 10-year deal with MassMutual, Sports
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Jersey patch ads could be coming for Yankees, Mets in the near future
Red Sox, MassMutual near a $17M jersey patch deal - Boston Business Journal