Arizona Diamondbacks
Although they have not thrown an MLB pitch in 2026, Merrill Kelly threw 17,036 pitches that were 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 relied primarily on their Change (88mph) and Fourseam Fastball (92mph), also mixing in a Cutter (91mph), Sinker (92mph), Curve (82mph) and Slider (86mph).
In 2025, compared to other RHP:
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 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 cutter is an extreme flyball pitch compared to other pitchers' cutters, has surprisingly little cutting action and has slightly above average velo. Their sinker generates fewer whiffs/swing compared to other pitchers' sinkers, has slight armside run and has some natural sinking action. Their curve generates fewer whiffs/swing compared to other pitchers' curves, 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.