Vespi was called up from Triple-A Norfolk on Friday.
Vespi will return to the big leagues after being sent down Saturday. The left-hander has produced a 3.98 ERA and 1.28 WHIP with 24 punchouts over 20.1 innings in 18 appearances with the Orioles this season. Since the beginning of July, Vespi has compiled a 2.08 ERA with 14 strikeouts over 8.2 frames in eight games with Baltimore.