One of the Astros biggest holes in the 2015 lineup was at first base, which was supposed to be manned by Jon Singleton at some point in the season. However, Singleton didn’t live up to the promise that he showed in the minor leagues. Instead, Chris Carter, Marwin Gonzalez, and Luis Valbuena all manned first base all year. Carter showed positive signs at the end of the season and into the playoffs, but he should not be counted on for too much longer by the Astros.