MassMutual is first jersey patch sponsor of the Red Sox
NYSportsJournalism.com - Media Kit
Red Sox reach $170 million jersey-patch deal, Mets also interested
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MassMutual will be the first sponsor to have its logo on Red Sox
Men's Boston Red Sox Pro Standard White Team Logo T-Shirt
Boston Red Sox land a 10-year partnership with MassMutual
Boston Red Sox sign BetMGM as first betting sponsor
Boston Red Sox Archives - SportsPro