Although they have not thrown an MLB pitch in 2023, George Kirby threw 2,350 pitches that were tracked by the PITCHf/x system in 2022, including pitches thrown in the MLB Regular Season and Spring Training. In 2022, they relied primarily on their Fourseam Fastball (95mph) and Slider (87mph), also mixing in a Curve (81mph), Sinker (95mph) and Change (86mph).
In 2022, compared to other RHP:
His fourseam fastball generates an extremely high number of swings & misses compared to other pitchers' fourseamers, has some natural sinking action, has well above average velo and results in somewhat more flyballs compared to other pitchers' fourseamers. His slider is basically never swung at and missed compared to other pitchers' sliders, results in many more groundballs compared to other pitchers' sliders, has short glove-side cut and is much harder than usual. His curve is basically never swung at and missed compared to other pitchers' curves, has a sharp downward bite and is slightly harder than usual. His sinker has well above average velo and has slight armside run. His change dives down out of the zone, generates fewer whiffs/swing compared to other pitchers' changeups, is slightly firmer than usual and has slight armside fade.