Seattle Mariners
Trevor Kelley has thrown 1,850 pitches that have been tracked by the PITCHf/x system between 2019 and 2024, including pitches thrown in the MLB Regular Season and Spring Training. In 2024, they have relied primarily on their Fourseam Fastball (89mph) and Slider (76mph). He also rarely throws a Cutter (82mph) and Change (80mph).
In 2024, compared to other RHP:
Their fourseam fastball generates an extremely high number of swings & misses compared to other pitchers' fourseamers, has heavy sinking action, has an obvious tail, has below average velo and results in somewhat more flyballs compared to other pitchers' fourseamers. Their slider comes in below hitting speed and sweeps across the zone. Their cutter (take this with a grain of salt because they've only thrown 7 of them in 2024) comes in below hitting speed, has heavy sink, generates a high number of swings & misses compared to other pitchers' cutters, is an extreme flyball pitch compared to other pitchers' cutters and has strong cutting action. Their change (take this with a grain of salt because they've only thrown 2 of them in 2024) is basically never swung at and missed compared to other pitchers' changeups, has an obvious armside fade, dives down out of the zone, has below average velo and results in more flyballs compared to other pitchers' changeups.