The righthander received a two-year deal worth $18.75 million with a club option for the 2024 season as well.
Former Marlins Reliever Matt Barnes Signs Minor League Deal With Washington Nationals - Fastball
Matt Barnes Speaking Fee and Booking Agent Contact
Boston Red Sox's Matt Barnes went from trade rumors to contract extension and All-Star Game appearance in 11-month span
Manny Machado in center of bad blood as Red Sox beat Orioles
Kenley Jansen, Red Sox agree to 2-year, $32 million contract
This is a place I wanted to stay.' Matt Barnes, Red Sox agree on extension to keep him through 2023 - The Boston Globe
Healthy Barnes arrives at Nats camp with goal of making club - Blog
Boston Red Sox's Matt Barnes says being named first-time All-Star
Matt Barnes, eight others cleared to rejoin Red Sox after determining they weren't risks to others due to COVID - The Boston Globe
This is a place I wanted to stay.' Matt Barnes, Red Sox agree on extension to keep him through 2023 - The Boston Globe
Boston Red Sox's Matt Barnes says being named first-time All-Star was 'wild moment': 'I knew there was a chance but you're never really certain'
Matt Barnes Signs Contract Extension, Here to stay., By Boston Red Sox