The Red Sox reinstated Martin (elbow) from the 15-day injured list Wednesday, Chris Cotillo of MassLive.com reports.
The right-hander looked good during his bullpen sessions over the past week and will rejoin the Red Sox without a minor-league rehab assignment. Martin has a 3.42 ERA, 1.03 WHIP and 29:2 K:BB across 26.1 innings this season and should return to a setup role now that he's healthy.