Arizona Diamondbacks
Merrill Kelly has thrown 9,586 pitches that have been tracked by the PITCHf/x system between 2019 and 2023, including pitches thrown in the MLB Regular Season, The World Baseball Classic and Spring Training. In 2023, they have relied primarily on their Fourseam Fastball (93mph), also mixing in a Curve (83mph), Sinker (92mph), Cutter (92mph) and Change (89mph). He also rarely throws a Slider (86mph).
In 2023, compared to other RHP:
Their fourseam fastball generates a high number of swings & misses compared to other pitchers' fourseamers, is an extreme flyball pitch compared to other pitchers' fourseamers and has essentially average velo. Their curve generates fewer whiffs/swing compared to other pitchers' curves, is much harder than usual, results in more flyballs compared to other pitchers' curves and has a sharp downward bite. Their sinker is an extreme flyball pitch compared to other pitchers' sinkers, has slight armside run and has some natural sinking action. Their cutter (take this with a grain of salt because they've only thrown 19 of them in 2023) is basically never swung at and missed compared to other pitchers' cutters, results in more flyballs compared to other pitchers' cutters, has surprisingly little cutting action, has well above average velo and has good "rise". Their change (take this with a grain of salt because they've only thrown 18 of them in 2023) is thrown extremely hard, is basically never swung at and missed compared to other pitchers' changeups, has an obvious armside fade, dives down out of the zone and results in somewhat more groundballs compared to other pitchers' changeups. Their slider (take this with a grain of salt because they've only thrown 7 of them in 2023) is an extreme flyball pitch compared to other pitchers' sliders and has primarily 12-6 movement.