Chicago Cubs
Mark Leiter Jr. has thrown 4,255 pitches that have been tracked by the PITCHf/x system between 2017 and 2024, all of them occuring in the MLB Regular Season. In 2024, they have relied primarily on their Splitter (85mph) and Sinker (91mph), also mixing in a Cutter (89mph) and Slider (80mph). He also rarely throws a Curve (74mph).
In 2024, compared to other RHP:
Their splitter generates an extremely high number of swings & misses compared to other pitchers' splitters, has slight cut action and has some natural sink to it. Their sinker is a prototypical pitch with few remarkable qualities. Their cutter is basically never swung at and missed compared to other pitchers' cutters, results in more flyballs compared to other pitchers' cutters and has some natural sink. Their slider comes in below hitting speed, sweeps across the zone, has exceptional depth and is an extreme flyball pitch compared to other pitchers' sliders. Their curve (take this with a grain of salt because they've only thrown 7 of them in 2024) has an exceptional bite, generates an extremely high number of swings & misses compared to other pitchers' curves, has below average velo and results in more flyballs compared to other pitchers' curves.