Houston Astros
John Rooney has thrown 2,312 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 Slider (81mph), also mixing in a Fourseam Fastball (93mph), Sinker (91mph) and Cutter (88mph). He also rarely throws a Change (86mph).
In 2025, compared to other LHP:
Their slider sweeps across the zone and results in somewhat more flyballs compared to other pitchers' sliders. Their fourseam fastball generates an extremely high number of swings & misses compared to other pitchers' fourseamers, has heavy sinking action, results in somewhat more flyballs compared to other pitchers' fourseamers, has slightly above average velo and has slightly less natural movement than typical. Their sinker has heavy sinking action, generates a very high amount of groundballs compared to other pitchers' sinkers and has less armside run than typical. Their cutter has heavy sink, has slightly above average velo and has strong cutting action. Their change (take this with a grain of salt because they've only thrown 8 of them in 2025) is basically never swung at and missed compared to other pitchers' changeups, has surprising cut action, dives down out of the zone, is an extreme flyball pitch compared to other pitchers' changeups and is much firmer than usual.