Non-MLB
Although they have not thrown an MLB pitch in 2024, Keury Mella threw 627 pitches that were tracked by the PITCHf/x system between 2017 and 2023, including pitches thrown in the MLB Regular Season, Spring Training and Fall/Winter Ball. In 2023, they relied primarily on their Fourseam Fastball (94mph) and Slider (81mph), also mixing in a Change (86mph).
In 2023, compared to other RHP:
Their fourseam fastball is an extreme flyball pitch compared to other pitchers' fourseamers, generates more whiffs/swing compared to other pitchers' fourseamers, has some natural sinking action, has essentially average velo and has slight armside run. Their slider (take this with a grain of salt because they've only thrown 10 of them in 2023) has exceptional depth, is an extreme flyball pitch compared to other pitchers' sliders and has below average velo. Their change (take this with a grain of salt because they've only thrown 5 of them in 2023) results in more flyballs compared to other pitchers' changeups, is slightly firmer than usual and has slight armside fade.