Arizona Diamondbacks
Merrill Kelly has thrown 16,016 pitches that have been tracked by the PITCHf/x system between 2019 and 2025, including pitches thrown in the MLB Regular Season, the MLB Postseason, The World Baseball Classic and Spring Training. In 2025, they have relied primarily on their Fourseam Fastball (92mph) and Change (88mph), also mixing in a Cutter (91mph), Sinker (92mph), Curve (82mph) and Slider (86mph).
In 2025, compared to other RHP:
Their fourseam fastball generates a high number of swings & misses compared to other pitchers' fourseamers, results in more flyballs compared to other pitchers' fourseamers, has some natural sinking action and has essentially average velo. Their change is thrown extremely hard, dives down out of the zone, results in somewhat more groundballs compared to other pitchers' changeups and has slight armside fade. Their cutter is an extreme flyball pitch compared to other pitchers' cutters, has surprisingly little cutting action and has slightly above average velo. Their sinker results in somewhat more flyballs compared to other pitchers' sinkers, has slight armside run and has some natural sinking action. Their curve is much harder than usual, has a sharp downward bite and results in somewhat more groundballs compared to other pitchers' curves. Their slider has primarily 12-6 movement and results in somewhat more groundballs compared to other pitchers' sliders.