The Red Sox have acquired reliever Andrew Bailey from the Athletics in exchange for outfielder Josh Reddick, according to sources. Bailey compiled 24 saves last year in Oakland to go along with a 3.24 ERA -- the highest earned run average in the right-hander's three years in the majors. He is expected to replace Jonathan Papelbon, who left as a free agent, as Boston's closer. The Red Sox will also receive outfielder Ryan Sweeney in the deal.