It turned out that the Padres contract never became official due to a MLB investigation on Mateo's date of birth. MLB suspended Mateo in March 2010 for one year for lying about his age, and his date of birth was changed from March 17, 1992 to March 22, 1990.
Here is what Badler had to say about Mateo as a pitcher:
An athletic 6-foot-3, 175-pound pitcher with good arm speed back in 2008, Mateo has since filled out to 200 pounds. Mateo pitched in Colombia this winter and has thrown 93-96 mph with good angle along with a slider.
Obviously Paul DePodesta, who is the Mets vice president of player development and scouting, had his hands all over this signing. DePodesta was working in the Padres front office during 2008, so he must like Mateo a lot to keep tabs on him throughout his suspension.
So Mateo is tall and throws hard? Sign me up!