The Boston Red Sox announced a major off-the-field partnership with MassMutual – Boston 25 News
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Proud Partner of the Boston Red Sox
Red Sox, MassMutual near a $17M jersey patch deal - Boston Business Journal
Houston Astros reveal Oxy as first ever jersey partner - SportsPro
Red Sox to sport MassMutual logo under new partnership - Boston Business Journal
Red Sox reach $170 million jersey-patch deal, Mets also interested
Red Sox play ball with a new signature sponsor - BOStoday
Sox say so long to John Hancock. But hello maybe to MassMutual. - The Boston Globe