Arizona Diamondbacks
Merrill Kelly has thrown 17,232 pitches that have been tracked by the PITCHf/x system between 2019 and 2026, including pitches thrown in the MLB Regular Season, the MLB Postseason, The World Baseball Classic and Spring Training. In 2026, they have relied primarily on their Change (88mph), Cutter (91mph) and Fourseam Fastball (91mph), also mixing in a Curve (81mph), Sinker (91mph) and Slider (85mph).
In 2026, compared to other RHP:
Their change dives down out of the zone, is much firmer than usual and results in more flyballs compared to other pitchers' changeups. Their cutter is basically never swung at and missed compared to other pitchers' cutters, is an extreme flyball pitch compared to other pitchers' cutters, has surprisingly little cutting action and has slightly above average velo. Their fourseam fastball is basically never swung at and missed compared to other pitchers' fourseamers, results in more flyballs compared to other pitchers' fourseamers, has some natural sinking action and has slightly below average velo. Their curve is basically never swung at and missed compared to other pitchers' curves, has a sharp downward bite, is slightly harder than usual and results in somewhat more flyballs compared to other pitchers' curves. Their sinker (take this with a grain of salt because they've only thrown 14 of them in 2026) is an extreme flyball pitch compared to other pitchers' sinkers, has slight armside run and has some natural sinking action. Their slider (take this with a grain of salt because they've only thrown 11 of them in 2026) is an extreme flyball pitch compared to other pitchers' sliders and has primarily 12-6 movement.