Oakland Athletics
Mark Leiter Jr. has thrown 6,437 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 (83mph).
In 2026, compared to other RHP:
Their sinker is a real worm killer that generates an extreme number of groundballs compared to other pitchers' sinkers. Their splitter is an extreme flyball pitch compared to other pitchers' splitters, generates more whiffs/swing compared to other pitchers' splitters, has slight cut action and has some natural sink to it. Their fourseam fastball generates more whiffs/swing compared to other pitchers' fourseamers, results in more flyballs compared to other pitchers' fourseamers 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 somewhat more flyballs compared to other pitchers' curves. Their cutter generates a very high amount of groundballs compared to other pitchers' cutters, has slightly above average velo and has some natural sink. Their slider (take this with a grain of salt because they've only thrown 8 of them in 2026) is basically never swung at and missed compared to other pitchers' sliders, has exceptional depth, results in more flyballs compared to other pitchers' sliders and has primarily 12-6 movement.