Righthanded reliever Burke Badenhop and the Red Sox agreed to a one-year, $2.15 million non-guaranteed contract Wednesday, avoiding salary arbitration.
Badenhop, 30, was acquired from the Brewers in November. He went 2-3 with a 3.47 ERA in 62.1 innings for Milwaukee last season.
Badenhop has an 18-20 record with three saves and a 3.98 ERA in parts of six big league seasons with the Marlins, Rays, and Brewers.
The Red Sox have four arbitration-eligible players remaining: 1B-OF Mike Carp; INF Jonathan Herrera, LHP Andrew Miller, and RHP Junichi Tazawa.