Boston Red Sox confirm MassMutual as signature sponsor - SportsPro

Red Sox play ball with a new signature sponsor - BOStoday

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Red Sox debut new uniform advertisements as part of 10-year deal with MassMutual, Sports

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

20160115 xbs wit by The Island 360 - Issuu

Red Sox reveal first-ever uniform advertisements; MassMutual patches coming in 2023

It's come to this: our Red Sox as human billboards

For the first time, historic Boston Red Sox jersey will have a sponsor patch

Iconic Massachusetts Brands Unite: MassMutual Named Signature Partner and First Ever Jersey Patch Sponsor of the Boston Red Sox