To make room on the 40-man roster for its newest addition, Oakland transferred southpaw Eric O'Flaherty -- recovering from Tommy John surgery and not expected back until midseason -- to the 60-man disabled list.
Savery, 28, was Philadelphia's first-round selection (19th overall) out of Rice University in the 2007 Draft. The Houston native went 2-0 with a 3.15 ERA in 18 appearances for the Phillies last year, holding opponents to a .205 average in 20 innings.
He has pitched in parts of the last three seasons with Philadelphia, compiling a 4.15 ERA and 1.28 WHIP in 41 games overall, striking out 32 but also yielding 42 hits in 47 2/3 innings.
Savery will face heavy competition in A's camp for a bullpen spot, and it's not automatic he'd battle Fernando Abad for a job as a lefty specialist, given his bizarre splits.
Last year, Savery held right-handers to a .118 average spanning 51 at-bats. Lefties, though, hit .409 off him in 22 at-bats. For his career, Savery's right-handed opponents have hit .212/.315/.363 off him, while left-handers have posted a .286/.304/.429 batting line.
Savery knows a thing or two about hitting as well. He has 348 at-bats in the Minors, mostly as a pitcher, and has hit .290 with four homers.
Jane Lee is a reporter for MLB.com. Read her blog, Major Lee-ague, and follow her on Twitter @JaneMLB. This story was not subject to the approval of Major League Baseball or its clubs.