Merrill Kelly has thrown 4,683 pitches that have been tracked by the PITCHf/x system between 2019 and 2021, all of them occuring in the MLB Regular Season. In 2021, he has relied primarily on his Fourseam Fastball (92mph), Sinker (92mph) and Curve (81mph), also mixing in a Change (87mph) and Cutter (91mph).
In 2021, compared to other RHP:
His fourseam fastball has some natural sinking action, has essentially average velo and results in somewhat more flyballs compared to other pitchers' fourseamers. His sinker has slight armside run and has some natural sinking action. His curve results in many more groundballs compared to other pitchers' curves, has a sharp downward bite and is slightly harder than usual. His change is slightly firmer than usual, has slight armside fade and has some natural sink to it. His cutter has good "rise", has little cutting action and has slightly above average velo.