During the 2006 season, he was with the Double-A West Tenn Diamond Jaxx until his call-up to the Cubs on August 1. On August 3, Mateo made his major league debut in a start in a game against the Arizona Diamondbacks as he replaced Greg Maddux in the rotation as he had just been traded. Mateo went 5 innings and picked up his first career win.\n', '

On May 2, 2008, he refused an assignment to Single-A Daytona and became a free agent. He later signed with the Pittsburgh Pirates, and became a free agent again at the end of the season. On December 22, 2008, he re-signed with the Pirates.\n', '

On February 1, 2010, Mateo signed a minor league contract with the Los Angeles Angels of Anaheim, but never pitched in their organization. In 2011, he signed with Vaqueros Laguna.\n', '

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