Merrill Kelly has thrown 7,891 pitches that have been tracked by the PITCHf/x system between 2019 and 2022, including pitches thrown in the MLB Regular Season and Spring Training. In 2022, they have relied primarily on their Fourseam Fastball (93mph) and Change (88mph), also mixing in a Cutter (91mph), Sinker (92mph) and Curve (82mph).
In 2022, compared to other RHP:
His fourseam fastball generates more whiffs/swing compared to other pitchers' fourseamers, has some natural sinking action, has essentially average velo and results in somewhat more flyballs compared to other pitchers' fourseamers. His change is thrown extremely hard, dives down out of the zone, results in many more groundballs compared to other pitchers' changeups and has slight armside fade. His cutter is an extreme flyball pitch compared to other pitchers' cutters, has well above average velo, has good "rise" and has little cutting action. His sinker has some natural sinking action. His curve is much harder than usual.