The Orioles selected Davidson's contract from Triple-A Norfolk on Saturday.
Davidson has been with Norfolk for the entire season, putting up a 3.89 ERA and 1.34 WHIP alongside a 104:46 K:BB across 32 appearances (17 starts). He'll now join the active roster to give the O's some additional bullpen depth to close the regular season, but with a career ERA of 5.98, he will likely be limited to low-leverage situations. Bryan Baker was optioned to the Florida Complex League in a corresponding move.