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Sox say so long to John Hancock. But hello maybe to MassMutual. - The Boston Globe
MassMutual will be the first sponsor to have its logo on Red Sox uniforms - The Boston Globe
Boston Red Sox Archives - SportsPro
It's come to this: our Red Sox as human billboards
The Boston Red Sox announced a major off-the-field partnership with MassMutual – Boston 25 News
Boston Red Sox Archives - SportsPro
Houston Astros reveal Oxy as first ever jersey partner - SportsPro
Sox say so long to John Hancock. But hello maybe to MassMutual. - The Boston Globe