Non-MLB
Although they have not thrown an MLB pitch in 2025, Trevor Kelley threw 2,856 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 Fourseam Fastball (88mph) and Slider (75mph). He also rarely threw a Cutter (82mph) and Change (79mph).
In 2024, compared to other RHP:
Their fourseam fastball comes in below hitting speed, has heavy sinking action, has an obvious tail, generates a high number of swings & misses compared to other pitchers' fourseamers and results in somewhat more groundballs compared to other pitchers' fourseamers. Their slider comes in below hitting speed, sweeps across the zone and results in more flyballs compared to other pitchers' sliders. Their cutter comes in below hitting speed, has heavy sink and is an extreme flyball pitch compared to other pitchers' cutters. Their change (take this with a grain of salt because they've only thrown 17 of them in 2024) has an obvious armside fade, dives down out of the zone, has below average velo, generates fewer whiffs/swing compared to other pitchers' changeups and results in more flyballs compared to other pitchers' changeups.