Singleton is confident he can avoid further relapses by focusing on his opportunity, keeping better company and avoiding bad situations. He calls his life a work in progress and is focused on not being so hard on himself this season.
"Recently I've been more or less just sticking to myself and worrying about what I need to do to get better and become better as a person, not just a baseball player," he said.
If he's able to do that, the Astros foresee a big future.
"My expectation is that with everything that happened to him, we want to build up the positives from the end of last year," Luhnow said, "and get off to a real good start in Triple-A and then force his way onto the roster in Houston."
The Associated Press contributed to this report.