Boston Red Sox confirm MassMutual as signature sponsor - SportsPro
MassMutual, Red Sox announce multiyear partnership
Proud Partner of the Boston Red Sox
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The Boston Red Sox announced a major off-the-field partnership with MassMutual – Boston 25 News
Sox say so long to John Hancock. But hello maybe to MassMutual. - The Boston Globe
Red Sox, MassMutual Partner Up
Red Sox, MassMutual Partner Up
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Red Sox reveal first-ever uniform advertisements; MassMutual patches coming in 2023