We already knew that Scott Feldman was going to be the Opening Day starter, but Brian McTaggart lets us know that the Astros have set the rotation for the rest of the opening series with the Yankees:
April 1: Scott Feldman vs. Faceless Yankee.
April 2: Jarred Cosart vs. Faceless Yankee.
April 3: Brett Oberholtzer vs. Faceless Yankee.
Seeing as how the Astros open the season with 13 straight games, they won't have the luxury of hiding a 5th starter. So you'll have Brad Peacock, Jerome Williams, Lucas Harrell, and Dallas Keuchel fighting for those final two spots.