A right-hander who turns 32 next month, Baez was 7-2 with a 3.10 ERA in 71 relief appearances last season, striking out 69 in 69 2/3 innings while walking 23. He had a $2.1 million salary last year and is eligible for free agency after this season.
Arbitrators Robert Herman, Jeanne Charles and Margaret Brogan made the decision Wednesday, a day after hearing arguments.
Boston pitcher Eduardo Rodriguez argued his case Wednesday, asking for a raise to $8,975,000 rather than the $8.3 million offer of the Red Sox. A right-hander who turns 27 in April, Rodriguez was a career-best 19-6 with a 3.81 ERA in 34 starts last season, when he made $4,325,000. He is eligible for free agency after the 2021 season.
The case was heard by Steven Wolf, Walt De Treux and Melinda Gordon, who are expected to rule Thursday.