Pittsburgh Pirates
Mason Montgomery has thrown 3,945 pitches that have been tracked by the PITCHf/x system between 2023 and 2026, including pitches thrown in the MLB Regular Season, The World Baseball Classic and Spring Training. In 2026, they have relied primarily on their Fourseam Fastball (98mph), also mixing in a Slider (89mph) and Curve (87mph). He also rarely throws a Change (91mph) and Sinker (98mph).
In 2026, compared to other LHP:
Their fourseam fastball generates an extremely high number of swings & misses compared to other pitchers' fourseamers, is thrown at a speed that's borderline unfair, has much less armside movement than typical and results in somewhat more groundballs compared to other pitchers' fourseamers. Their slider is thrown extremely hard, is a real worm killer that generates an extreme number of groundballs compared to other pitchers' sliders, generates more whiffs/swing compared to other pitchers' sliders and has some two-plane movement. Their curve is thrown extremely hard, generates more whiffs/swing compared to other pitchers' curves, has primarily 12-6 movement and results in somewhat more flyballs compared to other pitchers' curves. Their change is thrown extremely hard, is basically never swung at and missed compared to other pitchers' changeups, has surprising cut action and is an extreme flyball pitch compared to other pitchers' changeups. Their sinker is thrown at a speed that's borderline unfair, is an extreme flyball pitch compared to other pitchers' sinkers and has surprisingly little armside run.