The Houston Astros have activated outfielder Jacob Melton from the injured list ahead of their game against the Washington Nationals. Melton, a promising 24-year-old outfield prospect, had been sidelined since June 13 due to a right ankle sprain. In his brief stint with the team, he batted .241 with seven hits in 29 at-bats. His return is expected to add depth and balance to the Astros' lineup, and he is slated to start in center field for the series opener. In a corresponding move, the Astros designated first baseman Jon Singleton for assignment.