Boston Red Sox
Kyle Harrison has thrown 5,934 pitches that have been tracked by the PITCHf/x system between 2023 and 2025, including pitches thrown in the MLB Regular Season and Spring Training. In 2025, they have relied primarily on their Fourseam Fastball (94mph) and Curve (82mph), also mixing in a Change (86mph) and Cutter (88mph). He also rarely throws a Sinker (93mph).
In 2025, compared to other LHP:
Their fourseam fastball generates an extremely high number of swings & misses compared to other pitchers' fourseamers, has heavy sinking action, has well above average velo and has slight armside run. Their curve is thrown extremely hard, has little depth, results in somewhat more flyballs compared to other pitchers' curves and has slight glove-side movement. Their change is a real worm killer that generates an extreme number of groundballs compared to other pitchers' changeups, dives down out of the zone and is much firmer than usual. Their cutter has heavy sink, results in more flyballs compared to other pitchers' cutters, has slightly above average velo and has strong cutting action. Their sinker is an extreme flyball pitch compared to other pitchers' sinkers, has well above average velo and has some natural sinking action.