Mateo went 4-2 with a 1.74 ERA in 15 games, including two starts, for Dominican Summer League Mariners in 1996. He tossed two complete games and earned one save.\n', '

In 1997 Mateo went 3-1 with a 3.30 ERA in 13 outings, including six starts, for Arizona League Mariners.\n', '

With the Short-Season Everett AquaSox in 1998, Mateo went 3-3 with a 4.70 ERA and four saves in 28 relief appearances. He also allowed one run over 1​1⁄3 innings in his lone outing for the Class-A Advanced Lancaster JetHawks.\n', '

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