Oakland Athletics
Although they have not thrown an MLB pitch in 2025, Simon Castro threw 955 pitches that were tracked by the PITCHf/x system between 2010 and 2018, including pitches thrown in the MLB Regular Season and Spring Training. In 2018, they relied primarily on their Fourseam Fastball (91mph) and Slider (83mph).
In 2018, compared to other RHP:
Their fourseam fastball (take this with a grain of salt because they've only thrown 11 of them in 2018) 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, has slightly below average velo and has slightly less natural movement than typical. Their slider (take this with a grain of salt because they've only thrown 4 of them in 2018) generates an extremely high number of swings & misses compared to other pitchers' sliders, has exceptional depth, is an extreme flyball pitch compared to other pitchers' sliders and has primarily 12-6 movement.