Martin (shoulder) was activated from the 15-day injured list Sunday, Mac Cerullo of the Boston Herald reports.
Martin landed on the shelf with shoulder inflammation April 13, but he'll rejoin the Red Sox after one rehab outing with Triple-A Worcester. The 36-year-old has three holds with a 2.57 ERA, 1.29 WHIP and 2:1 K:BB across seven innings this season, and he could be in the mix with John Schreiber for saves in the immediate future with Kenley Jansen unavailable Sunday and day-to-day with back tightness.