Singleton, who was removed from the Astros' 40-man roster during the offseason, may find playing time at Triple-A Fresno difficult to come by, Jake Kaplan of the Houston Chronicle reports.
Singleton dropped off the map last season, hitting just .202 at Fresno and never reaching the majors. A former top prospect, the 25-year-old first baseman will be challenged by younger prospects A.J. Reed and Tyler White, both of whom are expected to start the season with the Grizzlies.