MLB's Red Sox land MassMutual as jersey patch sponsor - Sportcal
Boston Red Sox confirm MassMutual as signature sponsor - SportsPro
Posts - Baseball
Red Sox reportedly sign jersey patch deal with MassMutual
Red Sox, MassMutual Partner Up
Red Sox to sport MassMutual logo under new partnership - Boston Business Journal
Colorful jerseys here to stay: Red Sox president says team not planning future uniform changes, Sports
Logos and uniforms of the Boston Red Sox - Wikipedia
Cleveland Guardians to wear Marathon jersey patch