MassMutual will be the first sponsor to have its logo on Red Sox uniforms - The Boston Globe

MLB's Red Sox land MassMutual as jersey patch sponsor - Sportcal

Red Sox reveal first-ever uniform advertisements; MassMutual patches coming in 2023

Red Sox, MassMutual Partner Up

Red Sox reportedly sign jersey patch deal with MassMutual

MLB Jerseys' to Feature Corporate Sponsor Logos for First Time Ever In 2023

John Hancock ending long-held Boston Red Sox sponsorship

Chris Cotillo on X: MassMutual is the new “signature partner” of the Red Sox. They get a jersey patch and the sign that replaces the John Hancock sign in center field. /

Cleveland Guardians Announce Jersey Sponsorship - Sports Illustrated Cleveland Guardians News, Analysis and More

MLB's Red Sox land MassMutual as jersey patch sponsor - Sportcal

Red Sox Mass Mutual Collaboration – NBC Boston

jerseys – Blogging the Red Sox

Red Sox Sign Japanese Batting Champ Yoshida - Rafu Shimpo