Castillo was recalled from Triple-A Omaha on Saturday.

EDGE Analysis

Castillo has thrown 17 innings as a long reliever for the Royals this season, holding his own with a 4.24 ERA despite a low 13.7 percent strikeout rate. He's likely limited to a low-leverage role unless he can start to miss more bats. Jonathan Heasley was optioned in a corresponding move.