Seattle Mariners
Will Klein has thrown 2,021 pitches that have been tracked by the PITCHf/x system between 2023 and 2025, including pitches thrown in the MLB Regular Season and Spring Training. In 2025, they have relied primarily on their Fourseam Fastball (97mph) and Slider (86mph), also mixing in a Cutter (90mph) and Curve (84mph).
In 2025, compared to other RHP:
Their fourseam fastball generates an extremely high number of swings & misses compared to other pitchers' fourseamers and is blazing fast. Their slider has exceptional depth and is an extreme flyball pitch compared to other pitchers' sliders. Their cutter generates an extremely high number of swings & misses compared to other pitchers' cutters, has heavy sink, results in somewhat more flyballs compared to other pitchers' cutters, has slightly above average velo and has strong cutting action. Their curve is thrown extremely hard, has primarily 12-6 movement, has a sharp downward bite and results in somewhat more flyballs compared to other pitchers' curves.