Barnes allowed one hit and struck out three over two innings to pick up the win in Sunday's 7-5 victory over Detroit.
Barnes came on in the seventh inning with a man on and did his job without allowing a run; after Boston took the lead in the top of the eighth, he worked around a double in the bottom of the frame to record a second scoreless inning. Manager John Farrell's bullpen is afflicted by illness and injury right now, so Barnes has temporarily become the top setup man in Boston.