The A's acquired Johnson from the Orioles on Dec. 2 for second baseman Jemile Weeks and a player to be named, which became Minor League catcher David Freitas. The 30-year-old has led the league in saves for two straight seasons, compiling a total of 101 while posting a 2.72 ERA. He did struggle at times last year, blowing nine saves and suffering eight losses, but he still received a sizable raise from the $6.5 million he earned in 2013.
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. Jaso batted .282 with 15 extra-base hits against right-handed pitchers last year, and he has a .364 career on-base percentage in five seasons.
The A's acquired Jaso a year ago -- Jan. 16, 2013 -- in a three-team trade. Oakland sent three prospects -- A.J. Cole, Blake Treinen and Ian Krol -- to Washington in order to acquire Jaso. Jaso came from Seattle, and the Mariners acquired Mike Morse from the Nationals as part of the deal.
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.
Arbitration-eligible players who have not agreed to contracts will exchange salary figures with their clubs on Friday. Hearings are scheduled from Feb. 1-21.
Spencer Fordin is a reporter for MLB.com. Andrew Simon is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.