Pittsburgh Pirates
Although they have not thrown an MLB pitch in 2026, Isaac Mattson threw 2,745 pitches that were tracked by the PITCHf/x system between 2021 and 2025, including pitches thrown in the MLB Regular Season, Spring Training and Independent Leagues. In 2025, they relied primarily on their Fourseam Fastball (94mph), also mixing in a Slider (85mph) and Change (86mph). He also rarely threw a Curve (79mph).