BIOGRAPHY
Isaac Mattson was born July 14, 1995, in Erie, Pennsylvania. He is a pitcher in the MLB.
Mattson attended Harbor Creek High School in Harborcreek, Pennsylvania. In 2014, his senior year, he went 6–0 with a 0.67 ERA along with batting .531. He was not drafted out of high school in the 2014 MLB draft and enrolled at the University of Pittsburgh where he played college baseball.
In 2015, as a freshman at Pitt, Mattson appeared in 22 games, going 1–1 with a 3.82 ERA, and in 2016, his sophomore season, he pitched 34 innings in relief, compiling a 2–0 record with a 3.71 ERA. After his sophomore year, he played for the Chatham Anglers of the Cape Cod Baseball League and was named an All-Star. In 2017, as a junior, he pitched 31 innings out of the bullpen, going 1–0 with a 2.87 ERA, striking out 41. After the season, he was drafted by the Los Angeles Angels in the 19th round of the 2017 MLB draft.
After signing, Mattson made his professional debut with the Arizona League Angels before being promoted to the Orem Owlz, where he was named an All-Star. In 31 1⁄3 innings between the two clubs, he went 1–0 with a 1.44 ERA. In 2018, he played for the Burlington Bees and the Inland Empire 66ers, going 7–4 with a 3.82 ERA in 25 games (11 starts), and in 2019, he began the year with the 66ers before being promoted to the Mobile BayBears in May. In August, he was promoted to the Salt Lake Bees. Over 37 relief appearances between the three clubs, Mattson pitched to a 6–3 record with a 2.33 ERA, striking out 110 over 73 1⁄3 innings. He was selected to play in the Arizona Fall League for the Mesa Solar Sox following the season.
