Boston Red Sox land a 10-year partnership with MassMutual
Red Sox, MassMutual near a $17M jersey patch deal - Boston Business Journal
MassMutual is first jersey patch sponsor of the Red Sox
Sox say so long to John Hancock. But hello maybe to MassMutual. - The Boston Globe
Boston Red Sox Archives - SportsPro
Red Sox play ball with a new signature sponsor - BOStoday
Red Sox Mass Mutual Collaboration – NBC Boston
Houston Astros reveal Oxy as first ever jersey partner - SportsPro
Boston Red Sox Archives - SportsPro