Del Castillo will start at designated hitter and bat seventh in Wednesday's game against the Rangers.
Before sitting out Tuesday's 7-4 loss, Del Castillo had served as Arizona's designated hitter in seven straight games and went 3-for-21 with a double, two walks and three RBI over that stretch. With Gabriel Moreno returning from the injured list May 1, Del Castillo will likely see limited playing time behind the plate moving forward, but he's expected to be used in the strong side of a platoon at DH with Jose Fernandez.