MassMutual is first jersey patch sponsor of the Red Sox

MLB Fans Are Crushing The Braves Over Their Hideous Uniform Sponsor Patches

Colorful jerseys here to stay: Red Sox president says team not planning future uniform changes, Sports

MassMutual will be advertising on the Red Sox jersey in 2023. - Over the Monster

Red Sox will have MassMutual logo on their jerseys beginning in 2023

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

Boston Red Sox and Springfield-based life insurer, MassMutual partner up

MassMutual will be the first sponsor to have its logo on Red Sox uniforms - The Boston Globe

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

Red Sox reach $170 million jersey-patch deal, Mets also interested

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