Believe it or not, the A's most expensive free agent signing this offseason was a relief pitcher.

34-year-old Joakim Soria agreed to a two-year, $15 million contract with Oakland last month and figures to be a setup man for Blake Treinen.

Last year, Soria went 3-4 with 16 saves, a 3.12 ERA, and a 1.14 WHIP in 66 games between the White Sox and Brewers. He notched 75 strikeouts against 16 walks in 60 2/3 innings.

Soria has a career ERA of 2.88 in 11 seasons, averaging better than a strikeout per inning. His best years came in Kansas City from 2007-10 when he made two All-Star Games and maintained a sub-three ERA for four straight seasons.