He played a total of five seasons with Ateneo de Manila and also graduated with a Bachelor of Arts degree in 2006, something he considers a far more important achievement than any of the basketball accolades he ever got. He played under four college coaches: Joe Lipa, Joel Banal, Sandy Arespacochaga and Norman Black.
In the 2006 PBA draft Tenorio was the fourth overall draft pick by the San Miguel Beermen. He played an average of 25.5 minutes for Magnolia with a respectable average of 7.8 points, 4.6 assists and 3.6 rebounds in nine games.