MassMutual is first jersey patch sponsor of the Red Sox

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

Yankees won't have jersey patch for Opening Day, but it's coming

Boston Red Sox Announce MassMutual Patch on Jerseys Starting in 2023 – SportsLogos.Net News

Larger-Than-Life Drone Show Celebrates MassMutual's Sponsorship of the Boston Red Sox

Kiké Hernandez isn't a fan of the Red Sox's new ad patch

Bruins reveal cybersecurity firm Rapid7 will be first sponsor of patch on game and practice jerseys - The Boston Globe

I'm glad the Phillies didn't put sponsors on their jerseys. It looks so cheap. : r/phillies

Red Sox Mass Mutual Collaboration – NBC Boston

Red Sox play ball with a new signature sponsor - BOStoday