Non-MLB
Although they have not thrown an MLB pitch in 2025, Phillip Diehl threw 1,145 pitches that were tracked by the PITCHf/x system between 2019 and 2024, including pitches thrown in the MLB Regular Season, Spring Training and Fall/Winter Ball. In 2024, they relied primarily on their Slider (83mph) and Fourseam Fastball (91mph). He also rarely threw a Change (86mph).
In 2024, compared to other LHP:
Their slider generates fewer whiffs/swing compared to other pitchers' sliders, results in more flyballs compared to other pitchers' sliders, has primarily 12-6 movement and has some two-plane movement. Their fourseam fastball (take this with a grain of salt because they've only thrown 19 of them in 2024) generates an extremely high number of swings & misses compared to other pitchers' fourseamers, has an obvious tail, is an extreme flyball pitch compared to other pitchers' fourseamers, has some natural sinking action and has essentially average velo. Their change (take this with a grain of salt because they've only thrown 2 of them in 2024) generates an extremely high number of swings & misses compared to other pitchers' changeups, is an extreme flyball pitch compared to other pitchers' changeups, is much firmer than usual, has slight armside fade and has some natural sink to it.