Jacob will return to the majors as the roster replacement for Randy Vasquez, who landed on the injured list Friday with an ankle injury. Jacob has given up two runs in two MLB innings this season, but he's put up a 3.71 ERA and 1.12 WHIP through 34 innings in the minors. He'll likely be limited to low-leverage situations with the Padres.

Jacob was called up by San Diego on Friday and will return to El Paso after giving up two runs without recording an out in Saturday's contest. Sunday's starting pitcher Lucas Giolito was called up from Triple-A in a corresponding move.