Boston Red Sox sign BetMGM as first betting sponsor
MassMutual will be the first sponsor to have its logo on Red Sox
Red Sox reveal first-ever uniform advertisements; MassMutual
Proud Partner of the Boston Red Sox
NYSportsJournalism.com - Media Kit
Red Sox to sport MassMutual logo under new partnership - Boston
Red Sox play ball with a new signature sponsor - BOStoday
Boston Red Sox bag US$170m MassMutual jersey patch deal, says
Red Sox play ball with a new signature sponsor - BOStoday
Red Sox, MassMutual Partner Up
Boston Red Sox Archives - SportsPro