The A's avoided arbitration with two of their seven arbitration-eligible players on Thursday, agreeing to one-year contracts with closer Jim Johnson and catcher John Jaso. Jaso gets a $500,000 raise under the deal announced Thursday. Jaso batted .271 with a .387 on-base percentage for Oakland last season when he made $1.8 million but he suffered a concussion in late July and wasn't able to return to the field. Oakland has five players who remain eligible for salary arbitration: Pitcher Luke Gregerson and hitters Craig Gentry, Jed Lowrie, Brandon Moss and Josh Reddick. Gentry and Gregerson also were acquired in separate trades this offseason. New closer Jim Johnson agreed to a $10 million, one-year contract with the Oakland Athletics on Thursday. His first season with the two-time defending AL West champion A's was cut short after he sustained a concussion when he took a foul tip off his mask July 24 at Houston and complained of a headache.