Although he has not thrown an MLB pitch in 2020, Trevor Hildenberger threw 2,096 pitches that were tracked by the PITCHf/x system between 2016 and 2019, including pitches thrown in the MLB Regular Season, the MLB Postseason and Spring Training. In 2019, he relied primarily on his Change (77mph), Sinker (88mph) and Slider (77mph). He also rarely threw a Fourseam Fastball (91mph).
Basic description of 2019 pitches compared to other RHP:
His change comes in below hitting speed, dives down out of the zone, generates more whiffs/swing compared to other pitchers' changeups and results in somewhat more groundballs compared to other pitchers' changeups. His sinker is so slow that it is substantially gravitational, has heavy sinking action, has an obvious tail and results in many more groundballs compared to other pitchers' sinkers. His slider comes in below hitting speed, is basically never swung at and missed compared to other pitchers' sliders, has exceptional depth and results in more flyballs compared to other pitchers' sliders. His fourseam fastball (take this with a grain of salt because he's only thrown 16 of them in 2019) has an obvious tail, results in more flyballs compared to other pitchers' fourseamers, has some natural sinking action and has slightly below average velo.