Non-MLB
Jonathan Hernández has thrown 4,704 pitches that have been tracked by the PITCHf/x system between 2019 and 2025, including pitches thrown in the MLB Regular Season, Spring Training and Fall/Winter Ball. In 2025, they have relied primarily on their Slider (88mph) and Sinker (96mph). He also rarely throws a Fourseam Fastball (97mph) and Change (90mph).
In 2025, compared to other RHP:
Their slider 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, is much harder than usual and has some two-plane movement. Their sinker has an obvious tail, is blazing fast and has some natural sinking action. Their fourseam fastball (take this with a grain of salt because they've only thrown 10 of them in 2025) has heavy sinking action, is basically never swung at and missed compared to other pitchers' fourseamers, is blazing fast and has slight armside run. Their change (take this with a grain of salt because they've only thrown 10 of them in 2025) is thrown extremely hard, has an obvious armside fade, results in more flyballs compared to other pitchers' changeups and has some natural sink to it.