Drafted in the 16th round (454th overall) by the Washington Nationals in 1993.
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Mattes spent one season at junior college before signing as a draft-and-follow. He made good progress through the system and made Montreal's top 15 list after the 1996 season. Arm trouble over the next couple of seasons stunted his development until he rebounded in 2000 at Double-A and in the Arizona Fall League, where he ranked fourth with a 1.50 ERA. Mattes has regained his velocity and can maintain it, reaching as high as 97 mph but more regularly pitching in the low 90s. His size allows him to pitch on a nice downhill plane, and he supplements his heat with a 82-83 mph slurve. While he has made enormous progress, some parts of his game still need work. He needs to improve his command of his slurve and changeup, and he needs to learn to set a tempo that will allow him to pitch deeper into games. Mattes will move up to Triple-A this season and could get a look in Montreal at some point.
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