Boston Red Sox confirm MassMutual as signature sponsor - SportsPro
MassMutual becomes 'signature sponsor' for Boston Red Sox
Red Sox debut new uniform advertisements as part of 10-year deal with MassMutual, Sports
Sox say so long to John Hancock. But hello maybe to MassMutual. - The Boston Globe
MORE
Boston Red Sox Announce MassMutual Patch on Jerseys Starting in 2023 – SportsLogos.Net News
Boston Red Sox Archives - SportsPro
Red Sox to sport MassMutual logo under new partnership - Boston Business Journal
Houston Astros reveal Oxy as first ever jersey partner - SportsPro
NYSportsJournalism.com - Home
Proud Partner of the Boston Red Sox
Red Sox play ball with a new signature sponsor - BOStoday