Jonathan Singleton, the top prospect in the Houston Astros organization according to MLB.com, was suspended for 50 games by Major League Baseball for testing positive for marijuana.
The left-handed hitting first baseman, who will be able to compete during spring training, is expected to open the season for the Astros at Triple-A Oklahoma City.
He issued a statement on Wednesday apologizing for his actions.
"I was informed today that I have tested positive for marijuana," Singleton wrote in the statement.
"As a result, I am being suspended for the first 50 games of the 2013 season. I accept the penalty and take full responsibility for my actions. I apologize to my parents, the Houston Astros and (Astros general manager) Jeff Luhnow.
"The Astros have been nothing but supportive of me and good to me in my short time with the organization. My hope is to use this as a learning experience and spend the rest of my career proving to myself and the baseball community that this was a lapse in judgment, and is not in any way indicative of my character or my dedication to baseball or to my team."
Luhnow issued a statement stating that it is the Astros' hopes that Singleton will take the necessary steps to avoid making this mistake again.
The 50-game suspension indicates Singleton tested positive once before during his career.
"We learned today that Jonathan Singleton has tested positive for a drug of abuse and has been suspended 50 games as a result," Luhnow wrote in his statement.
"We are disappointed in the decisions that Jonathan made leading up to this positive test. Jonathan has expressed regret for his decision and we expect will take the necessary steps to ensure this doesn't happen again. He has owned up to his actions and that is a necessary first step. The Astros will support Jonathan through this difficult time and we hope this example will prevent other athletes from making similar decisions."
Singleton, who was acquired in the trade that sent Hunter Pence to the Philadelphia Phillies in 2011, hit .284 last season with 21 homers and 79 RBIs in 131 games at Double-A Corpus Christi.