Skaggs took the roster spot of reliever Sam Demel, who was optioned to Reno. Demel had been called up one day earlier and took the loss in Tuesday night's game.
Pollock was designated as the D-backs' "26th man" for Wednesday. Teams are allowed to add a 26th player for doubleheaders scheduled at least 48 hours in advance, with the stipulation that the player must be returned to the Minors following the second game.
Pollock had been up on two other occasions this season when the team placed players on paternity leave. With outfielder Justin Upton's status uncertain early in the morning, the team decided to carry an extra position player rather than an extra pitcher.