Kansas City Royals
Jonathan Heasley has thrown 4,576 pitches that have been tracked by the PITCHf/x system between 2021 and 2026, including pitches thrown in the MLB Regular Season and Spring Training. In 2026, they have relied primarily on their Fourseam Fastball (93mph) and Slider (86mph), also mixing in a Curve (81mph) and Change (85mph).
In 2026, compared to other RHP:
Their fourseam fastball (take this with a grain of salt because they've only thrown 10 of them in 2026) is a real worm killer that generates an extreme number of groundballs compared to other pitchers' fourseamers, has some natural sinking action and has essentially average velo. Their slider (take this with a grain of salt because they've only thrown 7 of them in 2026) generates an extremely high number of swings & misses compared to other pitchers' sliders and is an extreme flyball pitch compared to other pitchers' sliders. Their curve (take this with a grain of salt because they've only thrown 5 of them in 2026) is basically never swung at and missed compared to other pitchers' curves, results in more flyballs compared to other pitchers' curves, has a sharp downward bite, is slightly harder than usual and has primarily 12-6 movement. Their change (take this with a grain of salt because they've only thrown 4 of them in 2026) is basically never swung at and missed compared to other pitchers' changeups, dives down out of the zone, results in more flyballs compared to other pitchers' changeups, has slight cut action and is slightly firmer than usual.