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Isaac Mattson is a professional baseball pitcher for the Pittsburgh Pirates, known for his power arm and effectiveness out of the bullpen as a right-handed reliever. Born on July 14, 1995, in Erie, Pennsylvania, Mattson played college baseball at University of Pittsburgh before being selected by the Los Angeles Angels in the 19th round of the 2017 MLB Draft. He developed through the minor leagues with a focus on refining his fastball-slider combination, earning opportunities at the major league level.

Mattson made his MLB debut in 2021 and later joined the Pirates, where he has worked to establish himself as a reliable bullpen option. Known for his ability to generate strikeouts and attack hitters aggressively, he provides depth and versatility to Pittsburgh’s pitching staff. As he continues to gain experience, Mattson is developing into a dependable reliever capable of contributing in a variety of game situations.