Oakland Athletics
Mark Leiter Jr. has thrown 6,207 pitches that have been tracked by the PITCHf/x system between 2017 and 2026, including pitches thrown in the MLB Regular Season, the MLB Postseason, The World Baseball Classic and Spring Training. In 2026, they have relied primarily on their Sinker (93mph) and Splitter (85mph), also mixing in a Fourseam Fastball (93mph), Curve (74mph) and Cutter (91mph). He also rarely throws a Slider (84mph).
In 2026, compared to other RHP:
Their sinker is an extreme flyball pitch compared to other pitchers' sinkers and has slightly above average velo. Their splitter results in more flyballs compared to other pitchers' splitters, has slight cut action and has some natural sink to it. Their fourseam fastball generates an extremely high number of swings & misses compared to other pitchers' fourseamers, is an extreme flyball pitch compared to other pitchers' fourseamers, has some natural sinking action and has essentially average velo. Their curve has an exceptional bite, generates a high number of swings & misses compared to other pitchers' curves, has below average velo and results in more flyballs compared to other pitchers' curves. Their cutter (take this with a grain of salt because they've only thrown 12 of them in 2026) is basically never swung at and missed compared to other pitchers' cutters, is an extreme flyball pitch compared to other pitchers' cutters, has well above average velo, has little cutting action and has some natural sink. Their slider (take this with a grain of salt because they've only thrown 3 of them in 2026) is basically never swung at and missed compared to other pitchers' sliders, has exceptional depth, is an extreme flyball pitch compared to other pitchers' sliders and has primarily 12-6 movement.