Although they have not thrown an MLB pitch in 2023, Matt Bush threw 3,369 pitches that were tracked by the PITCHf/x system between 2016 and 2022, including pitches thrown in the MLB Regular Season and Spring Training. In 2022, they relied primarily on their Fourseam Fastball (97mph) and Curve (81mph), also mixing in a Slider (93mph). He also rarely threw a Sinker (96mph).
In 2022, compared to other RHP:
His fourseam fastball generates a high number of swings & misses compared to other pitchers' fourseamers, is blazing fast and has some added backspin. His curve has a sharp downward bite, is slightly harder than usual and results in somewhat more flyballs compared to other pitchers' curves. His slider is thrown extremely hard, has much less depth than expected, results in many more groundballs compared to other pitchers' sliders and has primarily 12-6 movement. His sinker (take this with a grain of salt because he's only thrown 3 of them in 2022) generates an extremely high number of swings & misses compared to other pitchers' sinkers, is an extreme flyball pitch compared to other pitchers' sinkers, is blazing fast, has less armside run than typical and has little sinking action compared to a true sinker.